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Parasitismo de Trichogrammapretiosum (Hymenoptera: Trichogrammatidae) sobre Spodoptera cosmioides (Lepidoptera: Noctuidae) a diferentes temperaturas

Authors: CABEZAS G., FERNANDO; MELO, MIRTES; GARCÍA, MAURO S.; DIEZ-RODRÍGUEZ, GABRIELA I.; NAVA, DORI E.;

Parasitismo de Trichogrammapretiosum (Hymenoptera: Trichogrammatidae) sobre Spodoptera cosmioides (Lepidoptera: Noctuidae) a diferentes temperaturas

Abstract

Spodoptera cosmioides (Lepidoptera: Noctuidae) es una plaga polífaga que provoca daños en varios cultivos, entre ellos los destinados a la producción de biodiesel, como ricino (Ricinus communis), piñón (Jatropha curcas) y tung (Aleurites fordii). Uno de los principales agentes de control biológico de lepidópteros plagas son los parasitoides de huevos del género Trichogramma. En este trabajo se evaluó la influencia de la temperatura en el desempeño de tres cepas (TRS13, TRS65 y TRS81) de Trichogramma pretiosum (Hymenoptera: Trichogrammatidae) sobre huevos de S. cosmioides y se determinó el límite térmico inferior de desarrollo y la constante térmica. Los experimentos se realizaron a temperaturas constantes (18, 20, 22, 25, 28 y 30 °C), humedad relativa de 70 ± 10% y fotoperiodo de 12:12 h L:O. La duración del período de desarrollo de las tres cepas de T. pretiosum mostró relación inversa con el aumento de la temperatura. Se observó que la temperatura afecta la emergencia del parasitoide, siendo superior al 74% para cada una de las cepas a 25 °C. Sin embargo, las temperaturas evaluadas no afectaron el número de adultos por huevo ni la proporción sexual. El límite térmico inferior de desarrollo (Tb) y la constante térmica (K) de las cepas fueron de 11,21 °C y 131,41 GD (grados día) para TRS13; 10,73 °C y 137,70 GD para TRS65 y 10,68 °C y 138,70 GD para TRS81. Spodoptera cosmioides (Lepidoptera: Noctuidae) is a polyphagous pest that causes damage to various crops including those used in the production of biodiesel, such as castor bean (Ricinus communis), Barbados nut (Jatropha curcas), and Tung-oil tree (Aleurites fordii). One of the main biological control agents of lepidopteran pests are egg parasitoids of the genus Trichogramma. The influence of temperature on the performance of three strains (TRS13, TRS65 and TRS81) of Trichogramma pretiosum (Hymenoptera: Trichogrammatidae) on eggs of S. cosmioides and thermal requirements were studied. The experiments were carried out at constant temperatures (18, 20, 22, 25 and 28) and 30 °C, 70 ± 10% relative humidity and photoperiod of 14:10 (light: dark) hours. The development time of the three strains of T. pretiosum was inversely related to temperature rise. The temperatures affected the parasitoid emergency, being higher than 74% for each of the strains at 25 °C. However, the temperatures tested did not affect the number of adults per egg and sex ratio. The lower temperature threshold (Tb) and thermal constant (K) were 11.21 °C and 131.41 DD (degree-days) for strain TRS13, 10.73 °C and 137.70 DD for TRS65 and 10.68 °C and 138.70 DD for TRS81.

Keywords

Parasitoide de huevos, Control biológico, Exigencias térmicas, Biological control, Lepidóptero plaga, Thermal requirements, Biodiesel, Lepidopteran pest, Egg parasitoid

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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