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Article

Toxicity and Influence of Sublethal Exposure to Sulfoxaflor on the Aphidophagous Predator Hippodamia variegata (Coleoptera: Coccinellidae)

by
Panagiotis J. Skouras
1,2,*,
Eirini Karanastasi
3,
Vasilis Demopoulos
2,
Marina Mprokaki
1,
George J. Stathas
1 and
John T. Margaritopoulos
4
1
Laboratory of Agricultural Entomology and Zoology, Department of Agriculture, Kalamata Campus, University of the Peloponnese, 24100 Antikalamos, Greece
2
Laboratory of Plant Protection, Department of Agriculture, Kalamata Campus, University of the Peloponnese, 24100 Antikalamos, Greece
3
Plant Protection Laboratory, Department of Agriculture, University of Patras, 30200 Messolonghi, Greece
4
Department of Plant Protection, Institute of Industrial and Fodder Crops, Hellenic Agricultural Organization “DEMETER”, 38334 Volos, Greece
*
Author to whom correspondence should be addressed.
Toxics 2023, 11(6), 533; https://doi.org/10.3390/toxics11060533
Submission received: 17 April 2023 / Revised: 2 June 2023 / Accepted: 12 June 2023 / Published: 14 June 2023
(This article belongs to the Special Issue Effect of Pesticides on Insects and Other Arthropods)
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Abstract

:
Hippodamia variegata (Goeze), the variegated ladybug, is a predator of many insect pests, especially aphids. Sulfoxaflor is a chemical insecticide that can be used to control many sap-feeding insect pests, for instance, plant bugs and aphids, as an alternative to neonicotinoids in different crops. To improve the combination of the H. variegata and sulfoxaflor in an IPM (integrated pest management) program, we studied the ecological toxicity of the insecticide to the coccinellid predator at sublethal and lethal doses. We examined the influence of sulfoxaflor on larvae of H. variegata using exposure doses of 3, 6, 12, 24, 48 (maximum recommended field rate (MRFR)), and 96 ng a.i. per insect. In a 15-day toxicity test, we observed decreased adult emergence percentage and survival, as well as an increased hazard quotient. The LD50 (dose causing 50% mortality) of H. variegata due to sulfoxaflor decreased from 97.03 to 35.97 ng a.i. per insect. The total effect assessment indicated that sulfoxaflor could be grouped as slightly harmful for H. variegata. Additionally, most of the life table parameters were significantly decreased after exposure to sulfoxaflor. Overall, the results present a negative influence of sulfoxaflor on H. variegata when applied at the recommended field dose for controlling aphids in Greece, which demonstrates that this insecticide may only be employed with care when used in IPM programs.

1. Introduction

The green peach-potato aphid, Myzus persicae (Sulzer) (Hemiptera Aphididae), is one of the main pests in peach orchards and various herbaceous crops in Greece and worldwide [1]. It is a polyphagous pest that infests over 400 plant species belonging to 40 distinct plant families [2].
Myzus persicae control relies on the use of chemical insecticides. However worldwide, the species has developed resistance to several classes of insecticides over the years, such as carbamates, organophosphates, neonicotinoids, and pyrethroids [3,4,5]. To date, at least seven mechanisms have been described regarding resistance to 84 active ingredients [6]. For example, populations collected in China have developed 5.6–115.0-fold resistance to thiacloprid, nitenpyram, chlorpyrifos, thiamethoxam, cyantraniliprole, and clothianidin compared to the susceptible populations [7] (for comprehensive reviews on this topic, see [3,4,5,6]). Furthermore, the extensive use of insecticides for their control of adversity affects many natural enemies (predators and parasites) of plant pests, including those of M. persicae [8,9,10,11], as well as the environment [12]. To overcome or delay the development of pest insecticide resistance, several strategies are available, such as insecticide resistance monitoring, alternation of active ingredients with different modes of action, and the incorporation of different control tools in Integrated Pest Management (IPM) schemes. On this basis, the combination of biological control agents (for instance, parasitoids and predators) with insecticides is an environmentally benign approach to manage pests in a socially acceptable and economically viable manner [13].
In various countries, the predatory ladybeetle, Hippodamia variegata (Goeze) (Coleoptera: Coccinellidae), is one of the most crucial natural enemies of aphid pests, including Dysaphis crataegi, Aphis fabae (Hemiptera: Aphididae), and M. persicae [14,15,16]. Certain biological traits of H. variegata, such as voracity, predation capacity, aphid consumption, and high reproductive rate, are responsible for its efficiency as a biological control agent. These traits have been well studied in different predator–aphid models [14,15,16].
A novel sulfoximine Insecticide, sulfoxaflor (Group 4C), was developed by Dow AgroSciences in 2010 [17]. Sulfoximines may be considered as fourth-generation neonicotinoid insecticides due to their similar mode of action. Nevertheless, sulfoxaflor is a nAChR (nicotinic acetylcholine receptor) competitive agonist/modulator that binds to nAChR in place of acetylcholine in the central nervous system of insects [18], in a manner different to other nAChR acting insecticides and neonicotinoids [15]. Sulfoxaflor is an effective insecticide for the management of piercing and sucking insect pests belonging to many families, such us Aphididae, Miridae, and Aleyrodidae [19].
Within this framework, the purpose of the present study was to investigate the long-term toxicity of sulfoxaflor on H. variegata. At this point, we have found the LD50s, NOERS (No Observed Effect Application Rates) from chronic exposure for the 2nd instar larvae of H. variegata in laboratory microcosms. This work may contribute to optimize the use of sulfoxaflor in IPM programmes, to protect natural enemies, and to maximize control of sap sucking insects.

2. Materials and Methods

2.1. Insecticide and Tested Concentrations

Commercial formulations of sulfoxaflor (Closer 120SC, Dow AgroSciences Greece) were dissolved in HPLC-grade acetone at different concentrations for the trials. The concentrations, applied on the biological control agent H. variegata, (3, 6, 12, 24, 48, and 96 ng a.i. per insect), were double diluted with acetone. The manufacturer’s maximum recommended field dose for controlling aphids in Greece is 48 ng sulfoxaflor per insect.

2.2. Test Species

Hippodamia Variegata

H. variegata laboratory colonies were obtained from individuals (approximately 100 adults coccinellids predators) collected in July 2017 from tobacco fields in the Meliki area in northern Greece [8]. The rearing procedure of H. variegata was performed according to (Skouras et al., 2019; 2021) [10,11]. Individuals of H. variegata were reared in cylindrical acrylic glass cages (50 ht × 30 diam. cm) and maintained in an environmentally controlled room at 25 ± 1 °C, 65 ± 2% relative humidity (RH) and a 16 L:8 D photoperiod. H. variegata was reared on A. fabae and M. persicae, which were maintained on Vicia faba (broad beans) at 20 ± 1 °C, 50 ± 5% RH, and 16 L:8 D.

2.3. Bioassays

Biological Control Agent Bioassays

The lethal toxicity and effect of the six concentrations of sulfoxaflor on H. variegata were studied in the laboratory by exposing second instar larvae (between 12–24 h old) to the insecticide through topical application, using a 10 μL Hamilton microsyringe [10,11]. The insecticide solution was applied in 1 μL of acetone to the mesonotum of each larva. Controls were treated with acetone only. Twenty larvae were examined for each sulfoxaflor concentration or control, and three replications per treatment were performed. The criterion for death was the failure of the insects to move their legs when stimulated with a fine brush. Larvae mortality, duration of the different life stages, pupae formation, and successful adult emergence were scored. Additionally, sex ratio, male and female adult longevity, fresh mass, fecundity, and adult or total pre-oviposition period (APOP and TPOP, respectively) were scored.

2.4. Risk Assessment

In order to assess the sulfoxaflor toxicological risk to H. variegata, we used the daily hazard quotient (HQ), which was estimated by dividing the maximum field recommended dose of sulfoxaflor by the sulfoxaflor concentration causing 50% mortality (LD50) to H. variegata obtained from a laboratory study [20]. Ratios equal to or greater than 2 indicate sulfoxaflor as a potential hazard to H. variegata. Ratios lower than 2 indicate a reduced intoxication risk. Using the Overmeer and van Zon (1982) formulas [21], the total effect (E) was calculated using the equation.
E (%) = 100 − (100 − Mc) × ER
where ER is the ratio of the mean weekly number of laid eggs by treated H. variegata females versus the number of control females, and Mc is the final corrected mortality. The insecticide sulfoxaflor has been classified into four toxicity categories, i.e., 1. harmless (Ε < 30%); 2. slightly harmful (30 ≤ Ε ≤ 79%); 3. moderately harmful (80 ≤ Ε ≤ 99%); and 4. harmful (Ε > 99%), according to the IOBC laboratory scale (International Organisation for Biological Control) [22].

2.5. Statistical Analysis

The mortality–dose relationship, LD50, was calculated by probit analysis using SPSS version 26.0 (SPSS Inc., Chicago, IL, USA). The population, life table parameters, and population projection are shown in Supplementary Materials. The developmental duration time and survival rates between the different stage/instars were compared using a repeated measure ANOVA to examine differences amongst the treatment groups. The Kolmogorov-Smirnov test was used to determined data normality. NOER (No Observed Effect Application Rates) values were estimated from the treatment comparison using a one-way ANOVA. All between or among-group differences of means were compared by Tukey’s test (HSD, p ≤ 0.05)

3. Results

3.1. Toxicity and Influence of Sulfoxaflor on the Survival Rate of H. variegata

Figure 1 and Table 1 illustrate how sulfoxaflor affects the survival rate of H. variegata. Survival of H. variegata treated with sulfoxaflor at 9 and 48 ng a.i. per insect significantly declined compared to the control group. However, there were no statistically significant differences among 6, 12, and 24 ng a.i. per insect treatments. The mortality rates of H. variegata on the 15th day of the experiment were 5.00%, 8.33%, 25.00%, 36.67%, 43.33%, 53.33%, and 65.00%, in 0 (control), 3, 6, 12, 24, 48, and 96 ng a.i. per insect treatments, respectively.
The estimated LD50 of sulfoxaflor for the 2nd instar H. variegata larvae 72 h after treatment was 48.35 ng ai per insect (95% confidence intervals 35.06–75.38 ng ai per insect), and it declined to 35.97 ng a.i. per insect 15 days after treatment (95% confidence intervals 26.06–54.88 ng ai per insect). The daily HQs for the second instar H. variegata larvae from day 1 to day 15 ranged from 0.5 to 1.33, all lower than 2, which is the limit of concern (Figure 2).

3.2. Influence of Sulfoxaflor on the Developmental Time, Female and Male Adult Longevity, and Female Pre-Oviposition Period of H. variegata

The growth period (2nd to 4th instar) for H. variegata larvae treated with sulfoxaflor lasted about seven to eight days, followed by pupation (four days). The larval growth period for the control group was significantly shorter than for the sulfoxaflor group (ANOVA, p < 0.05, NOER = 3 ng a.i. per insect). The pupal stage duration was significantly longer for the sulfoxaflor treated groups at doses above 12 ng a.i. per insect than for the controls (ANOVA, p < 0.05, NOER = 12 ng a.i. per insect). The APOP and the TPOP were significantly prolonged for the sulfoxaflor treated groups compared to the control group (ANOVA, p < 0.05, NOER = 12 and 3 ng a.i. per insect for APOP and TPOP, respectively). The longevities of female predator coccinellids exposed to 48 and 96 ng a.i. of sulfoxaflor per insect were 41.08 and 41.18 days, respectively, and they were significantly shorter compared to the control group (ANOVA, p < 0.05, NOER = 24 ng a.i. per insect). The male adult longevity was decreased as the doses increased, but it did not change significantly between the control and treatment groups (Table 2).

3.3. Influence of Sulfoxaflor on Fecundity, Adult Weight, Sex Ratio, Total Effect, and IOBC Toxicity Categories of H. variegata

There were no statistically significant differences in the female proportion after exposure to sulfoxaflor (p = 0.800; NOER > 96 ng a.i. per insect). Sulfoxaflor 24–96 ng a.i. per insect significantly reduced the H. variegata adult weight (p < 0.05; NOER = 12 ng a.i. per insect). Compared to the control group, doses of 12–96 ng a.i. per insect significantly decreased the mean fecundity of females (p < 0.05; NOER = 6 ng a.i. per insect). The mean female fecundity decreased as the dose of sulfoxaflor increased (Table 2).

3.4. Influence of Sulfoxaflor on Population Parameters and Population Projection of H. variegata

The sulfoxaflor treatments significantly reduced the net reproduction rate (R0), the finite rate of increase (λ), and the intrinsic rate of increase (r) values compared to the control (Table 3). The differences were significant at doses ranging 6–96 ng a.i. per insect. The mean generation time (T) was higher for all doses when H. variegata larvae were exposed to sulfoxaflor, compared to the control.
Figure 3 shows the projected population size of H. variegata larvae during 120 days from a given initial population and following different treatments. The population size of H. variegata after 120 days in the sulfoxaflor group projected to be 7.2 to 10.1-fold larger than the initial population, whereas, for the control group, the size was projected to reach 11.0-fold compared to the initial population.

4. Discussion

Chemical insecticides have been the only used method to control aphids [3]. However, this had led to the development of insecticide resistance with noticeable examples those of M. persicae and Aphis gossypii Glover (Hemiptera Aphididae) (see [23]), which have developed resistance to many classes of insecticides and are ranked among the ten most resistant arthropods worldwide [24]. Strategies involving mitigation of resistance, i.e., rotation of insecticides with different MoA, along with protection and augmentation of natural control agents, are of primary importance. More precise IPM strategies are required to slow down or suppress insecticide resistance. The present study focused on the determination of toxicity and safety aspects of sulfoxaflor on H. variegata, an important aphid predator.
We found that the LD50 of sulfoxaflor to H. variegata 15 days post treatment decreased from 97.03 to 35.97 ng a.i. per insect because of the cumulative mortality that originated from the toxic effect of sulfoxaflor. The same LD50 value pattern was found in bioassays with clothianidin [25], nitenpyram [26] and imidacloprid [27], and C. septempunctata, indicating that sulfoxaflor had a potential risk for H. variegata. Furthermore, three days after imidacloprid application, the fourth instar larvae of H. variegata showed LD50 values 15.11 ng a.i. per insect [8], showing that neonicotinoids, such as imidacloprid, may be more toxic and of higher risk for H. variegata than sulfoxaflor. The obtained HQ values for H. variegata were always below the safety threshold value of 2, demonstrating that sulfoxaflor was relatively safe for this aphid predator. Similarly, a HQ value below 2 was calculated for the 2nd instar larvae of Harmonia axyridis (Coleoptera: Coccinellidae) after sulfoxaflor exposure [28], or for the 2nd instar larvae of C. septempunctata after nitenpyram exposure [26]. Nevertheless, HQ values greater than 2 were calculated for various neonicotinoid insecticides, such us thiamethoxam for adults of Serangium japonicum (Coleoptera: Coccinellidae) [29] and clothianidin for larvae of C. septempunctata [25]. In the present study, sulfoxaflor at 3 ng a.i. per insect appeared to be harmless to H. variegata larvae (IOBC Class I). However, exposure to 6–96 ng a.i. per insect appeared to be slightly harmful to H. variegata larvae (IOBC Class II), which shows that sulfoxaflor is considered as relatively safe.
The total effect calculation is often used to assess toxicity due to different doses of insecticides on beneficial insects, such us predators and parasitoids [28]. In the present study, sulfoxaflor at ≤3 ng a.i per insect was harmless (IOBC Class 1). Interestingly, at application rates between 6 and 96 ng a.i. per insect, sulfoxaflor was slightly harmful (IOBC Class 2), which is the level of relative safety. Similarly, sulfoxaflor was found harmless (IOBC Class 1) for third instar larvae of Chrysoperla carnea (Neuroptera: Chrysopidae) [30], but it was moderately harmful (IOBC Class 3) for Nesidiocoris tenuis (Hemiptera: Miridae) [31] and highly harmful (IOBC Class 4) for the fourth instar larvae of Adalia bipunctata (Coleoptera: Coccinellidae) [28]. Sulfoxaflor was moderately harmful (IOBC Class 3) at an application rate of 180 g a.i. per hectare, and it was slightly harmful at ≤90 g a.i. per hectare for H. axyridis (Coleoptera: Coccinellidae) [28]. The variation amongst these studies could be attributed to differences in the examined predator species or in the used bioassay methods [32]. The E values found in the present study suggest that sulfoxaflor at doses ≥6 ng a.i. per insect could be classified as slightly harmful for H. variegate larvae. At a dose corresponding to twice the label rate (96 ng a.i. per insect), sulfoxaflor was shown to be slightly harmful. These results suggest that sulfoxaflor could reduce H. variegata efficiency in IPM programs.
Sulfoxaflor doses ≥3 ng a.i. per insect significantly extended the duration of larval and pupal stages of H. variegata. Extended preadult developmental time has been found in many aphid predators, such as H. axyridis [28], Chrysoperla rufilabris (Neuroptera: Chrysopidae) [33], and C. carnea [34] after treatment with sulfoxaflor. These findings can be explained either by the antifeeding effect of sulfoxaflor on coccinellid predators [35] and the consequent reduced food intake or by the fact that affected larvae may use their metabolic energy for sulfoxaflor detoxification at expenses of their development and growth [10,32,36].
In the present study, sulfoxaflor, except for the pupal duration time, significantly extended APOP (NOER < 24 ng a.i. per insect) and TPOP (NOER < 3 ng a.i. per insect). These findings agree to those reported in previous studies, which examined the effects of sulfoxaflor on H. axyridis [28,37]. Sulfoxaflor reduced the fecundity (NOER = 12 ng a.i. per insect), fresh mass (NOER = 24 ng a.i. per insect), and the adult emergence rate of H. variegata (NOER = 6 ng a.i. per insect). These results may be related to sulfoxaflor MoA. Sulfoxaflor adversely affects predators’ neurosecretory system, leading to tremor and partial or complete paralysis, decreasing nervous activity, feeding efficiency, and predatory energy [28].
Population growth parameters, such as the net reproductive rate (R0), intrinsic rate of increase (r), mean generation time (T), and finite rate of increase (λ), can provide valuable information about H. variegata population dynamics. Treatment at doses ≥6  ng sulfoxaflor per insect reduced the R0, λ, and r of H. variegata. Reduction in those population growth parameters could be associated with decreased adult fresh mass, survival, fecundity, and longevity [9,10,11,28,32,36,38]. Population parameter reduction for sulfoxaflor treated groups probably underwent the physiological antifeeding effect caused by sulfoxaflor. In general, this agrees with our results, in which we showed that sulfoxaflor, even at low exposure doses, reduces not only fecundity, but also adult fresh mass, longevity, APOP, TPOP, and the main population parameters of H. variegata.
The effect of sulfoxaflor at sublethal doses was assessed only by direct application, so the sulfoxaflor effect may be more pronounced when the predator is exposed to the maximum field concentration rate indirectly (consuming contaminated plant material and/or prey during foraging) [39]. In addition, the sublethal effects can adversely affect not only the treated parental generation, but also the progeny of the exposed coccinellids via transgenerational effects [40]. Negative effects of sulfoxaflor on the next generation have been reported by [39] for C. septempunctata and by [37] for H. axyridis. Overall, the decreased demographic parameters of H. variegata demonstrated that low dosage of sulfoxaflor may affect survival and reproduction in the next generation, resulting in reduced biological control efficacy provided by H. axyridis [39].

5. Conclusions

Understanding the effect of pesticides on aphid predators will assist the improvement of combination strategies and, consequently, the IPM program effectiveness. Sulfoxaflor adversely affected many H. variegata life table parameters. Taken as a whole, implementation of sulfoxaflor and H. variegata in IPM practices should be carefully employed.

Supplementary Materials

The following supporting information can be downloaded at: https://www.mdpi.com/article/10.3390/toxics11060533/s1, “References [41,42,43,44,45] are cited in the Supplementary Materials”.

Author Contributions

P.J.S. designed experiments; P.J.S. and M.M. carried out experiments; P.J.S. and J.T.M. analyzed experimental results, P.J.S., G.J.S., V.D., E.K. and J.T.M. wrote the manuscript; P.J.S., E.K. and J.T.M. revised manuscript. All authors have read and agreed to the published version of the manuscript.

Funding

This research is co-financed by Greece and the European Union (European Social Fund- ESF) through the Operational Programme “Human Resources Development, Education and Lifelong Learning” in the context of the project “Reinforcement of Postdoctoral Researchers” (MIS-5001552), implemented by the State Scholarships Foundation (ΙΚΥ).

Institutional Review Board Statement

All procedures performed in the study were in accordance with the ethical standards of the institution in which the study was conducted.

Informed Consent Statement

Not applicable.

Data Availability Statement

The data presented in this study are available on request from the corresponding author.

Acknowledgments

We wish to thank John Louloudakis for his assistance with the laboratory bioassays.

Conflicts of Interest

The authors declare no conflict of interest.

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Toxics 11 00533 g001 550
Figure 1. Survival rates of H. variegata larvae at six different doses (ng a.i. per insect) of sulfoxaflor during the 15 d observation period of a long-term toxicity test. Data are expressed as the mean values ± SE (standard error), n  =  3.
Figure 1. Survival rates of H. variegata larvae at six different doses (ng a.i. per insect) of sulfoxaflor during the 15 d observation period of a long-term toxicity test. Data are expressed as the mean values ± SE (standard error), n  =  3.
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Toxics 11 00533 g002 550
Figure 2. Estimated HQ and LD50 values of H. variegata in response to sulfoxaflor. Error bars correspond to the 95% confidence intervals (95% CI).
Figure 2. Estimated HQ and LD50 values of H. variegata in response to sulfoxaflor. Error bars correspond to the 95% confidence intervals (95% CI).
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Toxics 11 00533 g003 550
Figure 3. Population projection for H. variegata larvae exposed to different doses of sulfoxaflor. The estimated population size of H. variegata from an initial population in which 2nd instar larvae were treated with acetone (control) or 3, 6, 12, 24, 48, and 96 ng per insect of sulfoxaflor, respectively.
Figure 3. Population projection for H. variegata larvae exposed to different doses of sulfoxaflor. The estimated population size of H. variegata from an initial population in which 2nd instar larvae were treated with acetone (control) or 3, 6, 12, 24, 48, and 96 ng per insect of sulfoxaflor, respectively.
Toxics 11 00533 g003
Table
Table 1. Influence of sulfoxaflor on the cumulative mortality for the pre-adult period, sex ratio, fresh mass, fecundity, total effect, and IOBC toxicity categories of the insecticide applied on 2nd instar H. variegata larvae. Within each column, treatments sharing the same superscript letter were not significantly different (ANOVA, Tukey’s HSD Test, p ≤ 0.05).
Table 1. Influence of sulfoxaflor on the cumulative mortality for the pre-adult period, sex ratio, fresh mass, fecundity, total effect, and IOBC toxicity categories of the insecticide applied on 2nd instar H. variegata larvae. Within each column, treatments sharing the same superscript letter were not significantly different (ANOVA, Tukey’s HSD Test, p ≤ 0.05).
TreatmentDose Used (ng a.i. per Insect)Proportion of Female (%)Fresh Mass of Adults (mg)Cumulative Mortality (%)Fecundity (Eggs/Female)Total Effect (E *)IOBC Toxicity Category *
Control-56.61 ± 8.36 a10.20 ± 0.25 a05.00 ± 2.88 e804.72 ± 56.99 a--
Sulfoxaflor356.33 ± 0.78 a10.02 ± 0.27 ab08.33 ± 1.67 e575.61 ± 53.65 ab11.321
648.89 ± 1.11 a09.47 ± 0.29 abc25.00 ± 2.89 d532.14 ± 44.12 ab30.392
1247.44 ± 1.28 a09.34 ± 0.34 abc36.67 ± 1.67 c486.61 ± 58.78 b45.292
2443.94 ± 4.01 a08.74 ± 0.30 bc43.33 ± 1.67 bc431.33 ± 66.21 b55.912
4847.04 ± 15.40 a08.44 ± 0.33 c53.33 ± 1.67 b435.23 ± 65.73 b61.002
9652.38 ± 4.12 a08.31 ± 0.35 c65.00 ± 2.89 a392.00 ± 72.90 b73.722
* The IOBC toxicity categories for laboratory experiments are in accordance with the total effects caused by insecticides: (1) harmless (E < 30%); (2) slightly harmful (30% ≤ E ≤ 79%); (3) moderately harmful (80% ≤ E ≤ 99%); and (4) highly harmful (E > 99%).
Table
Table 2. Development time of H. variegata when 2nd-instar larvae were treated with sulfoxaflor. Within each column, treatments sharing the same superscript letter were not significantly different (ANOVA, Tukey’s HSD Test, p ≤ 0.05).
Table 2. Development time of H. variegata when 2nd-instar larvae were treated with sulfoxaflor. Within each column, treatments sharing the same superscript letter were not significantly different (ANOVA, Tukey’s HSD Test, p ≤ 0.05).
TreatmentDose Used (ng a.i. per Insect)Duration of Different Life Stages (d)
2nd Instar3rd Instar4th Instar2nd to 4th InstarPupaeFemale Adult Longevity (d)APOPaTPOPbMale Adult Longevity (d)
Control-1.65 ± 0.064 b1.79 ± 0.070 c3.46 ± 0.087 b6.89 ± 0.111 b3.70 ± 0.075 b60.31 ± 2.84 a2.03 ± 0.18 d17.72 ± 0.29 d43.84 ± 3.03 a
Sulfoxaflor32.05 ± 0.048 a1.82 ± 0.059 bc3.89 ± 0.106 ab7.76 ± 0.104 a4.07 ± 0.100 ab46.94 ± 2.82 ab2.32 ± 0.21 cd19.29 ± 0.29 c41.04 ± 3.09 a
62.04 ± 0.044 a2.07 ± 0.074 abc3.89 ± 0.079 ab8.00 ± 0.119 a4.09 ± 0.083 ab45.23 ± 4.29 ab2.46 ± 0.24 cd19.77 ± 0.35 bc38.83 ± 3.16 a
121.97 ± 0.070 a2.13 ± 0.086 ab3.87 ± 0.094 ab7.97 ± 0.144 a4.08 ± 0.087 ab44.44 ± 4.32 ab3.06 ± 0.36 bcd20.44 ±0.38 abc34.95 ± 3.38 a
241.88 ± 0.082 ab2.06 ± 0.072 abc3.74 ± 0.088 ab7.68 ± 0.132 a4.12 ± 0.101 a43.73 ± 4.32 ab3.47 ± 0.31 abc20.53 ± 0.42 abc36.47 ± 3.47 a
481.68 ± 0.090 b2.07 ± 0.102 abc3.86 ± 0.112 ab7.61 ± 0.165 a4.21 ± 0.079 a41.08 ± 6.68 b4.31 ± 0.54 ab21.62 ± 0.45 a34.27 ± 3.91 a
961.62 ± 0.129 b2.19 ± 0.088 a3.95 ± 0.129 a7.76 ± 0.217 a4.14 ± 0.104 a41.18 ± 5.19 b4.55 ± 0.68 a21.54 ± 0.49 ab27.80 ± 4.79 a
a Adult pre-oviposition period. b Total pre-oviposition period.
Table
Table 3. Estimates of life table parameters of H. variegata when 2nd-instar larvae were treated with sulfoxaflor. Within each column, treatments sharing the same superscript letter were not significantly different on the paired bootstrap test at the 5% significance level.
Table 3. Estimates of life table parameters of H. variegata when 2nd-instar larvae were treated with sulfoxaflor. Within each column, treatments sharing the same superscript letter were not significantly different on the paired bootstrap test at the 5% significance level.
TreatmentDose Used
(ng a.i. per Insect)		Life Table Parameters
Net Reproduction Rate (R0) (Female Female−1)Intrinsic Rate of Increase (r) (Female Female−1d−1)Finite Rate of Increase (λ) (Female Female−1d−1)Mean Generation Time (T) (d)
Control-362.69 ± 53.94 a0.2053 ± 0.0086 a1.2279 ± 0.0105 a28.71 ± 0.74 b
Sulfoxaflor3251.32 ± 40.99 ab0.1869 ± 0.0073 ab1.2055 ± 0.0088 ab29.57 ± 0.56 a
6164.89 ± 31.67 bc0.1774 ± 0.0083 bc1.1941 ± 0.0099 bc28.78 ± 0.68 b
12123.37 ± 29.03 cd0.1658 ± 0.0099 bcd1.1804 ± 0.0117 bcd29.04 ± 0.66 b
2491.13 ± 24.90 cd0.1542 ± 0.0113 cd1.1667 ± 0.0131 cd29.26 ± 0.79 a
4879.69 ± 23.76 d0.1400 ± 0.0105 d1.1503 ± 0.0120 d31.27 ± 0.68 a
9660.73 ± 20.03 d0.1339 ± 0.0141 d1.1433 ± 0.0160 d30.67 ± 1.45 ab
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MDPI and ACS Style

Skouras, P.J.; Karanastasi, E.; Demopoulos, V.; Mprokaki, M.; Stathas, G.J.; Margaritopoulos, J.T. Toxicity and Influence of Sublethal Exposure to Sulfoxaflor on the Aphidophagous Predator Hippodamia variegata (Coleoptera: Coccinellidae). Toxics 2023, 11, 533. https://doi.org/10.3390/toxics11060533

AMA Style

Skouras PJ, Karanastasi E, Demopoulos V, Mprokaki M, Stathas GJ, Margaritopoulos JT. Toxicity and Influence of Sublethal Exposure to Sulfoxaflor on the Aphidophagous Predator Hippodamia variegata (Coleoptera: Coccinellidae). Toxics. 2023; 11(6):533. https://doi.org/10.3390/toxics11060533

Chicago/Turabian Style

Skouras, Panagiotis J., Eirini Karanastasi, Vasilis Demopoulos, Marina Mprokaki, George J. Stathas, and John T. Margaritopoulos. 2023. "Toxicity and Influence of Sublethal Exposure to Sulfoxaflor on the Aphidophagous Predator Hippodamia variegata (Coleoptera: Coccinellidae)" Toxics 11, no. 6: 533. https://doi.org/10.3390/toxics11060533

APA Style

Skouras, P. J., Karanastasi, E., Demopoulos, V., Mprokaki, M., Stathas, G. J., & Margaritopoulos, J. T. (2023). Toxicity and Influence of Sublethal Exposure to Sulfoxaflor on the Aphidophagous Predator Hippodamia variegata (Coleoptera: Coccinellidae). Toxics, 11(6), 533. https://doi.org/10.3390/toxics11060533

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