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Studies on cold hardiness and diapause initiation of agromyza frontella diptera agromyzidae



Studies on cold hardiness and diapause initiation of agromyza frontella diptera agromyzidae



Annals of the Entomological Society of America 78(2): 248-251



The supercooling-point values for field-collected [soil from an alfalfa field] and laboratory-reared alfalfa blotch leafminer, A. frontella (Rondani), pupae were always below -25.degree. C, with no evident seasonal changes, as reported for other northerly freeze-intolerant species. Nondiapausing pupae were exposed to -10.degree. C for 21 days at different stages of pupal development and then returned to 20.degree. C. Some adults emerged, particularly from pupae placed at -10.degree. at 6 and 9 days of age, a developmental stage similar to the partially developed overwintering individuals. Photoperiodic conditions during egg and larval development influenced the initiation of pupal diapause, which increased from < 5 to > 55% with a decrease in the light period from 18-10 h, at both 15.degree. and 20.degree. C. The effect of temperature was less pronounced, although under a 14 h light period significantly more pupae were in diapause if eggs and larvae were reared at 15.degree. C (39.8%) than at 20.degree. C (22.3%).

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Accession: 006505740

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