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Temperature-dependent simulation of the effects of detrimental high temperatures on the survival of Mexican bean beetle eggs (Coleoptera: Coccinellidae)

By: Contributor(s): Material type: ArticleArticleLanguage: English Description: 13(1):86-94Subject(s): LOC classification:
  • 27496
 In: Environmental EntomologySummary: Se expusieron huevos de Epilachna varivestis durante periodos de 2, 3, 15 y 30 min y 1, 2, 4, 6 y 24 h a temp. de 30, 35, 38, 40, 42 y 44 grados centigrados y luego se eclosionaron a 25 grados centigrados. Los testigos no expuestos se mantuvieron a 25 grados centigrados. A su vez, la supervivencia, como porcentaje de aquella de los huevos no expuestos, disminuyo al aumentar los tiempos de exposicion a temp. por encima de 30 grados centigrados, pero los periodos de desarrollo no difirieron para cualquier combinacion de temp.-exposicion en la cual ocurrio eclosion. A partir de la relacion supervivencia-exposicion para cada temp., se determinaron las exposiciones que resultaron en 90, 70, 50, 30 y 10 por ciento de supervivencia y los reciprocos de las exposiciones (x 100 por ciento) dieron las tasas de acumulacion de dano requerido para causar mortalidad DEL 10, 30, 50, 70 y 90 por ciento de los huevos, resp. Las relaciones de tasa de acumulacion de dano-temp. para dichos 5 niveles de mortalidad se utilizaron exitosamente para simular la supervivencia de 9 grupos de huevos en condiciones fluctuantes de temp. en el invernadero y para predecir la abundancia de larvas de primer instar a partir de la oviposicion observada en un campo de soya. (RA-CIAT)Summary: Eggs of the Mexican bean beetle, Epilachna varivestis, were exposed for durations of 2, 3, 15, and 30 min, and 1, 2, 4, 6, and 24 h to temp. of 30, 35, 38, 40, 42, and 44 degrees Celsius and then were hatched at 25 degrees Celsius. Unexposed controls were maintained at 25 degrees Celsius. Survival as a percentage of that for unexposed eggs decreased with increasing exposure times at temp. above 30 degrees Celsius, but developmental periods did not differ for any temp.-exposure combination at which hatch occurred. From the survival-exposure relationship for each temp., the exposures that resulted in 90, 70, 50, 30, and 10 percent survival were determined, and the reciprocals of the exposures (x 100 percent) gave the rates of injury accumulation required to cause mortality of 10, 30, 50, 70, and 90 percent of the eggs, resp. The injury accumulation rate-temp. relationships for those 5 mortality levels were used successfully to simulate the survival of 9 egg cohorts under fluctuating temp. conditions in the greenhouse and to predict the abundance of 1st-instar larvae from observed oviposition in 1 soybean field. (AS)
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Journal Article Journal Article CIAT Library Document collection CINFOS Document Collection CINFOS 27496 (Browse shelf(Opens below)) c.1 Short Loan 100062490
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Se expusieron huevos de Epilachna varivestis durante periodos de 2, 3, 15 y 30 min y 1, 2, 4, 6 y 24 h a temp. de 30, 35, 38, 40, 42 y 44 grados centigrados y luego se eclosionaron a 25 grados centigrados. Los testigos no expuestos se mantuvieron a 25 grados centigrados. A su vez, la supervivencia, como porcentaje de aquella de los huevos no expuestos, disminuyo al aumentar los tiempos de exposicion a temp. por encima de 30 grados centigrados, pero los periodos de desarrollo no difirieron para cualquier combinacion de temp.-exposicion en la cual ocurrio eclosion. A partir de la relacion supervivencia-exposicion para cada temp., se determinaron las exposiciones que resultaron en 90, 70, 50, 30 y 10 por ciento de supervivencia y los reciprocos de las exposiciones (x 100 por ciento) dieron las tasas de acumulacion de dano requerido para causar mortalidad DEL 10, 30, 50, 70 y 90 por ciento de los huevos, resp. Las relaciones de tasa de acumulacion de dano-temp. para dichos 5 niveles de mortalidad se utilizaron exitosamente para simular la supervivencia de 9 grupos de huevos en condiciones fluctuantes de temp. en el invernadero y para predecir la abundancia de larvas de primer instar a partir de la oviposicion observada en un campo de soya. (RA-CIAT) spa

Eggs of the Mexican bean beetle, Epilachna varivestis, were exposed for durations of 2, 3, 15, and 30 min, and 1, 2, 4, 6, and 24 h to temp. of 30, 35, 38, 40, 42, and 44 degrees Celsius and then were hatched at 25 degrees Celsius. Unexposed controls were maintained at 25 degrees Celsius. Survival as a percentage of that for unexposed eggs decreased with increasing exposure times at temp. above 30 degrees Celsius, but developmental periods did not differ for any temp.-exposure combination at which hatch occurred. From the survival-exposure relationship for each temp., the exposures that resulted in 90, 70, 50, 30, and 10 percent survival were determined, and the reciprocals of the exposures (x 100 percent) gave the rates of injury accumulation required to cause mortality of 10, 30, 50, 70, and 90 percent of the eggs, resp. The injury accumulation rate-temp. relationships for those 5 mortality levels were used successfully to simulate the survival of 9 egg cohorts under fluctuating temp. conditions in the greenhouse and to predict the abundance of 1st-instar larvae from observed oviposition in 1 soybean field. (AS) eng

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