Toxicity of Organosilicone Adjuvants and Selected Pesticides to the Asian Citrus Psyllid (Hemiptera: Psyllidae) and Its Parasitoid Tamarixia radiata (Hymenoptera: Eulophidae)

Cocco, Arturo; Hoy, Marjorie A.

doi:10.1653/0015-4040-91.4.610

Cited by 10 publications

(6 citation statements)

References 31 publications

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“…This practice will likely continue until other effective non-chemical management methods can be developed and adopted. While some studies have shown positive impacts of adjuvants (Cocco & Hoy, 2008;Demkovich, Siegel, Walse, & Berenbaum, 2018;Seal, Ciomperlik, Richards, & Klassen, 2006), most of those studies included conventional insecticides. Our results, however, did not show significant benefits of using adjuvants with the selected organic insecticides.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of adjuvants to improve control of spotted‐wing drosophila in organic fruit production

Roubos

Gautam

Fanning

et al. 2019

J Applied Entomology

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Spotted‐wing drosophila, Drosophila suzukii (Matsumura), is a key pest of berry crops in the United States. It is managed intensively using insecticides, but organic fruit growers have few effective chemical control options. Spinosad is the most effective organically approved product for control of D. suzukii, while other organic options have not shown high levels of control. Adjuvants are products added to pesticides to improve effectiveness, and these may function as stickers, spreaders or surfactants improving the spray coverage of insecticides on surfaces and thereby increasing the likelihood that pests will contact residues. We conducted experiments evaluating organically approved biopesticides in combination with three adjuvants including poly‐1‐p‐menthene, alcohol ethoxylate and polyether‐polymethylsiloxane‐copolymer polyether to determine whether addition of adjuvants improved efficacy and residual activity of these products. Alcohol ethoxylate and poly‐1‐p‐menthene showed some inherent insecticidal activity against D. suzukii in laboratory assays. Adjuvants increased mortality of some insecticides but not to a level that would provide adequate fruit protection. Poly‐1‐p‐menthene had a negative effect when combined with hydrogen peroxide + PAA and sabadilla alkaloids. Mortality in semi‐field bioassays was quite low except for spinosad. Polyether‐polymethylsiloxane‐copolymer polyether had a negative effect on the efficacy of spinosad. The adjuvants did not extend residual activity of the insecticides. Adjuvants did not provide the expected benefits of increased performance against D. suzukii when combined with organic biopesticides. Other methods for enhancing these insecticides will need to be explored to provide organic growers with more effective chemical control options for this invasive pest.

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Section: Discussionmentioning

confidence: 99%

Evaluation of adjuvants to improve control of spotted‐wing drosophila in organic fruit production

Roubos

Gautam

Fanning

et al. 2019

J Applied Entomology

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“…Pesticides effective for controlling ACP populations can negatively affect beneficial insects, such as T. radiata (Hall & Nguyen, 2010; Li et al., 2020). Several insecticides have been documented as harmful to T. radiata adults on contact in laboratory bioassays, and a few have been reported to cause sublethal effects (Cocco & Hoy, 2008; Hall & Richardson, 2013; Beloti et al., 2015; Tofangsazi et al., 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Determining the selectivity of pesticides through knowledge of their residual effects on natural enemies in field conditions is essential to minimize their potential side effects on biological control and integrated pest management (IPM) programs (Machado et al., 2019; Duso et al., 2020). There has been some research into the selectivity of pesticides on T. radiata ; however, most of these studies have been conducted in laboratory or greenhouse conditions (Cocco & Hoy, 2008; Hall & Nguyen, 2010; Hall & Richardson, 2013; Beloti et al., 2015; Tofangsazi et al., 2018). A major goal of our research was to evaluate the side effects of insecticides on T. radiata in Florida, an economically significant citrus production area where both parasitoid and insecticides are widely used.…”

Section: Introductionmentioning

confidence: 99%

Topical and field‐tested residual effects of globally used insecticides on the parasitoid Tamarixia radiata released against the Asian citrus psyllid, Diaphorina citri

Rugno,

Qureshi

2023

Entomologia Exp Applicata

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Tamarixia radiata (Waterston) (Hymenoptera: Eulophidae) is the key parasitoid of the Asian citrus psyllid (ACP), Diaphorina citri Kuwayama (Hemiptera: Liviidae), in several citrus‐producing regions of the world. Chemical control is common to suppress ACP. Insecticides from globally used classes of insecticides for controlling ACP were tested on its primary parasitoid, T. radiata. Evaluations included dose–response of dimethoate, fenpropathrin, and imidacloprid in a topical application and lethal and sublethal effects from residues of imidacloprid, fenpropathrin, horticultural mineral oil (HMO), pyrethrin, and spirotetramat at 1, 3, and 7 days after application (DAA) of sprays on citrus trees in the orchard. The parasitism potential of the females that survived insecticide exposure was evaluated on untreated nymphs of ACP developing on citrus shoots and untreated parasitoid females were evaluated on nymphs treated with insecticides. In the topical application, imidacloprid was 8× more toxic to T. radiata than dimethoate and fenpropathrin. The lethal effect of the residues from imidacloprid and fenpropathrin sprays was more detrimental than other insecticides. Parasitoid mortality from 1‐ to 3‐day‐old residues averaged 90–96% for imidacloprid, 83–94% for fenpropathrin, 38–77% for pyrethrin, 43–44% for HMO, and 17–33% for spirotetramat. Parasitism by females that survived insecticide exposure was reduced by 71–88% from fenpropathrin, 28–59% from pyrethrin, 31–55% from imidacloprid, 44–4% from spirotetramat, and 39–11% from HMO compared to untreated females. The lethal and sublethal effects of all insecticides on T. radiata were significantly reduced at 7 DAA, suggesting a lower impact on its establishment and performance if releases are made after a week from spray application.

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“…Besides, triphenyl phosphate (TPP) and diethyl maleate (DEM) are also important synergists through inhibiting the detoxification enzymes activities (Wang et al, 2013, 2014). In addition, adjuvants are often used in combination with many classes of pesticides to increase the control efficacy and reduce the application amount (Cocco and Hoy, 2008). Depending on the charge of the hydrophilic group, adjuvants are generally categorized into cationic, anionic, and non-ionic compounds (Olkowska et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

The Mechanism by Which Dodecyl Dimethyl Benzyl Ammonium Chloride Increased the Toxicity of Chlorpyrifos to Spodoptera exigua

et al. 2017

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Beet armyworm, Spodoptera exigua (Hübner) is one of the most destructive pests that causes significant losses in crops. Unfortunately, S. exigua have developed resistance toward the majority of insecticides. Synergists may provide an important choice to deal with the resistance problems. Dodecyl dimethyl benzyl ammonium chloride (DDBAC) is a cationic surfactant, which displayed enhancement effect when combined with chlorpyrifos against S. exigua, giving enhancement factors of 1.50 and 1.57 at the concentrations of 90 and 810 mg L−1. In order to clarify the possible mechanisms, we investigate the effects of DDBAC on detoxification enzymes. However, DDBAC showed no inhibition on these enzymes activities. Meanwhile, scanning electron microscope images indicated DDBAC did not affect the cuticle super micro structure of S. exigua. The alterations in cuticular penetration rate have also been observed; indeed, it has been suggested that synergism is obtained by an acceleration of insecticide penetration through the cuticle. The chlorpyrifos penetration increased sharply when combined with 90 and 810 mg L−1 DDBAC, with only 12.6 and 8.5% of the initial chlorpyrifos recovered by external rinsing after 8 h. In contrast, when there was no DDBAC, more than 23.3% of the initial dose was recovered after 8 h.

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Toxicity of Organosilicone Adjuvants and Selected Pesticides to the Asian Citrus Psyllid (Hemiptera: Psyllidae) and Its Parasitoid Tamarixia radiata (Hymenoptera: Eulophidae)

Cited by 10 publications

References 31 publications

Evaluation of adjuvants to improve control of spotted‐wing drosophila in organic fruit production

Evaluation of adjuvants to improve control of spotted‐wing drosophila in organic fruit production

Topical and field‐tested residual effects of globally used insecticides on the parasitoid Tamarixia radiata released against the Asian citrus psyllid, Diaphorina citri

The Mechanism by Which Dodecyl Dimethyl Benzyl Ammonium Chloride Increased the Toxicity of Chlorpyrifos to Spodoptera exigua

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