Abstract
Cold tolerance studies were conducted under laboratory conditions for coccons ofAllorhogas pyralophagus Marsh, a Mexican parasitoid of graminaceous borers. By storage, developmental time (from cocoon to adult emergence) could be extended by 2 to 6 times. However, cocoons stored for more than 14 days at 2°C failed to survive, while at 5 and 10°C, about 50% emergence was recorded for upto 21 days of storage. With respect to survival and adult longevity, 10°C seemed to be the most suitable storage temperature. Pre-emergence period was also significantly increased by storing cocoons for 21 to 35 days at this temperature. Sex-ratio of emerging adults was not significantly affected by storage. Fecundity was adversely affected in all the treatments except in the case of females emerging from cocoons stored at 5°C for 7 days. The progeny of parasitoids which emerged from cocoons stored at 5 and 10°C for 35 days consisted of only males. It is clear from the present study thatA. pyralophagus cocoons are more amenable to short-term storage.
Résumé
Des études de tolérance au froid ont été réalisées sous conditions de laboratoire sur les cocons d'Allorhogas pyralophagus, parasitoïde mexicain des mineuses des graminées. Par conservation, le temps de développement (du cocon à l'apparition de l'adulte) pouvait être allongé de 2 à 6 fois. Cependant les cocons conservés durant plus de 14 jours à 2°C ne pouvaient pas survivre, tandis qu'à 5 et 10°C, 50% environ d'éclosion était enregistrée après 21 jours de conservation. Compte tenu de la survie et de la longévité de l'adulte, 10°C semblait être la température de conservation la plus favorable. La période de pré-émergence était aussi augmentée significativement en conservant les cocons, de 21 à 35 jours à cette température. Le sex-ratio des adultes éclos n'était pas affecté d'une façon significative par la conservation. La fécondité était affectée défavorablement dans tous les essais, excepté dans le cas de femelles émergeant de cocons conservés à 5°C durant 7 jours. La descendance des parasitoïdes issus de cocons conservés à 5 et 10°C durant 35 jours était uniquement mâle. Il ressort de l'étude présente que les cocons d'A. pyralophagus sont plus sensibles à la conservation à court terme.
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Contribution No. 285/87 of the Indian Institute of Horticultural Research, Bangalore-560 089.
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Ballal, C.R., Singh, S.P., Jalali, S.K. et al. Cold tolerance of coccons ofAllorhogas pyralophagus [Hym.: Braconidae] . Entomophaga 34, 463–468 (1989). https://doi.org/10.1007/BF02374383
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DOI: https://doi.org/10.1007/BF02374383