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Toxicity assessment of two IGR insecticides on eggs and larvae of the ladybird Eriopis connexa

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Titel: Toxicity assessment of two IGR insecticides on eggs and larvae of the ladybird Eriopis connexa
Autoren: Fogel Marilina Noelia, Scorsetti Ana Clara, Minardi Graciela, Schneider Marcela Inés
Quelle: Pest Management Science. 79:1316-1323
Verlagsinformationen: Wiley, 2022.
Publikationsjahr: 2022
Schlagwörter: 2. Zero hunger, 0106 biological sciences, Insecticides, PYRIPROXYFEN, 15. Life on land, 01 natural sciences, Juvenile Hormones, Coleoptera, Larva, LETHAL AND SUBLETHAL EFFECTS, Animals, Female, INSECTICIDES TOXICITY, LADYBUG, TEFLUBENZURON
Beschreibung: BACKGROUNDEriopis connexa is an important predator in the Neotropical region, associated with pests of economic relevance on horticultural crops in Argentina. The use of broad‐spectrum insecticides could reduce the biodiversity of these natural enemies in agroecosystems and put at risk its conservation. New, selective “risk reduced” insecticides could be an alternative to conventional chemical control to promote sustainable agriculture. The goal of this work was to assess the lethal and sublethal effects of two insect growth regulator (IGR) insecticides on eggs and two larval instars of E. connexa exposed to insecticides.RESULTSPyriproxyfen and cypermethrin significantly affected egg hatching by 28.8% and 70.4%, respectively. Pyriproxyfen reduced the survival of larvae that emerged by ≈52% from Day (D3)3 after hatching and caused the lengthening of developmental time for both larval and pupal stages. By contrast, teflubenzuron did not reduce hatching and survival but shortened the developmental time of the pupae stage. Cypermethrin reduced the survival of 2nd (L2) and 4th (L4) larval instars by 36.4% and 74.6%, respectively, and lengthened the development time of L2. Pyriproxyfen lengthened the development time of L4 and reduced the fecundity and fertility of females. Teflubenzuron reduced survival of L2 and L4 larval instars by 46.9% and 28.6%, respectively, and lengthened the total development time for the larval stage. In addition, teflubenzuron reduced the fecundity and fertility of females.CONCLUSIONSBoth eggs and larvae were susceptible to exposure to IGR, showing lethal and sublethal effects. This study highlights, once again, the higher toxicity of cypermethrin to E. connexa. The toxicity of both IGR insecticides could impair the performance of E. connexa as a biological control agent in agroecosystems. © 2022 Society of Chemical Industry.
Publikationsart: Article
Dateibeschreibung: application/pdf
Sprache: English
ISSN: 1526-4998
1526-498X
DOI: 10.1002/ps.7293
Zugangs-URL: https://pubmed.ncbi.nlm.nih.gov/36411496
http://hdl.handle.net/11336/213300
Rights: Wiley Online Library User Agreement
CC BY NC SA
Dokumentencode: edsair.doi.dedup.....098cc7cca541f9c20f1692fcd9326e2e
Datenbank: OpenAIRE
Beschreibung
Abstract:BACKGROUNDEriopis connexa is an important predator in the Neotropical region, associated with pests of economic relevance on horticultural crops in Argentina. The use of broad‐spectrum insecticides could reduce the biodiversity of these natural enemies in agroecosystems and put at risk its conservation. New, selective “risk reduced” insecticides could be an alternative to conventional chemical control to promote sustainable agriculture. The goal of this work was to assess the lethal and sublethal effects of two insect growth regulator (IGR) insecticides on eggs and two larval instars of E. connexa exposed to insecticides.RESULTSPyriproxyfen and cypermethrin significantly affected egg hatching by 28.8% and 70.4%, respectively. Pyriproxyfen reduced the survival of larvae that emerged by ≈52% from Day (D3)3 after hatching and caused the lengthening of developmental time for both larval and pupal stages. By contrast, teflubenzuron did not reduce hatching and survival but shortened the developmental time of the pupae stage. Cypermethrin reduced the survival of 2nd (L2) and 4th (L4) larval instars by 36.4% and 74.6%, respectively, and lengthened the development time of L2. Pyriproxyfen lengthened the development time of L4 and reduced the fecundity and fertility of females. Teflubenzuron reduced survival of L2 and L4 larval instars by 46.9% and 28.6%, respectively, and lengthened the total development time for the larval stage. In addition, teflubenzuron reduced the fecundity and fertility of females.CONCLUSIONSBoth eggs and larvae were susceptible to exposure to IGR, showing lethal and sublethal effects. This study highlights, once again, the higher toxicity of cypermethrin to E. connexa. The toxicity of both IGR insecticides could impair the performance of E. connexa as a biological control agent in agroecosystems. © 2022 Society of Chemical Industry.
ISSN:15264998
1526498X
DOI:10.1002/ps.7293