Effect of anonaceous extracts on Aphis gossypii (Glover, 1887) (Hemiptera: Aphididae) and selectivity to Eriopis connexa (Germar, 1824) (Coleoptera: Coccinellidae)



Document title: Effect of anonaceous extracts on Aphis gossypii (Glover, 1887) (Hemiptera: Aphididae) and selectivity to Eriopis connexa (Germar, 1824) (Coleoptera: Coccinellidae)
Journal: Acta scientiarum. Agronomy
Database: PERIÓDICA
System number: 000460150
ISSN: 1679-9275
Authors: 1
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Institutions: 1Universidade Federal de Alagoas, Centro de Ciencias Agrarias, Rio Largo, Alagoas. Brasil
Year:
Volumen: 40
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental, analítico
English abstract . The effects of ethanolic and hexanic extracts of soursop and sugar apple (EES, EHS, EESA and EHSA, respectively) on Aphis gossypii (Hemiptera: Aphididae) and its natural enemy Eriopis connexa (Coleoptera: Coccinellidae) by contact exposure, residual effect and ingestion tests were evaluated. The estimated LC50 and LC99 values for A. gossypii were 0.39% and 5.47% for (EESA); 0.23% and 1.19% for (EES); 0.47% and 4.39% for (EHSA); and 0.42% and 6.38% for (EHS), respectively. Considering contact exposure, EES at 0.23% was innocuous, and EHS at 0.42% was slightly harmful; for adult ladybugs, only EESA (5.47%) was classified as slightly harmful, with the other treatments classified as harmless. The results were similar for the residual effect. For selectivity in ingestion tests, EES and EHS at the LC50 did not affect the survival rate of the predator, but EESA (0.39% and 5.47% for the LC50 and LC99, respectively) reduced the survival rate to zero in less than 7 days, resembling chemical treatment with Decis®. Extracts applied to the eggs of an alternative prey reduced the consumption of eggs and therefore the predatory capacity of the ladybug, which led to a decrease in oviposition, egg viability and ultimately a reduction in predator fecundity. EES at a concentration of 0.23% was effective in the control of A. gossypii and was selective and did not affect the survival rate of the its natural enemy E. connexa
Portuguese abstract Avaliou-se a eficiência dos extratos etanólicos e hexânicos de graviola e pinha (EEG, EHG, EEP e EHP) sobre Aphis gossypii (Hemiptera: Aphididae) e seu inimigo natural Eriopis connexa (Coleoptera: Coccinellidae), com testes de contato, efeito residual e ingestão. As CL50 e CL99 estimadas para A. gossypii foram respectivamente, 0,39 e 5,47% para (EEP); 0,23 e 1,19% para (EEG); 0,47 e 4,39% para (EHP); 0,42 e 6,38% para (EHG). Na ação por contato, o EEG a 0,23% foi inócuo, o EHG a 0,42% foi levemente nocivo; para adultos apenas o EEP (5,47%), foi classificado como levemente nocivo e os demais tratamentos como inócuos, inclusive para o efeito residual. Quanto à seletividade por ingestão, as CL50 do EEG e EHG não interferiram na taxa de sobrevivência dos predadores, mas o EEP (0,39 e 5,47%) reduziu a zero essa taxa em menos de 7 dias, assemelhando-se ao tratamento químico Decis®. Os extratos reduziram o consumo de ovos da presa alternativa, diminuindo a capacidade predatória e, com isso, diminuiu na oviposição, afetando a fecundidade do predador e a viabilidade dos ovos. O EEG na concentração de 0,23% foi eficiente no controle de A. gossypii, e seletivo ao inimigo natural E. connexa, não interferindo na taxa de sobrevivência destes
Disciplines: Agrociencias,
Biología
Keyword: Insectos,
Quelicerados,
Aphis gossypii,
Eriopis connexa,
Extractos vegetales,
Dosis letal
Keyword: Insects,
Chelicerata,
Aphis gossypii,
Eriopis connexa,
Plant extracts,
Aphis gossypii,
Eriopis connexa,
Lethal dose,
Annona squamosa,
Annona muricata
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