Studies on Cold Hardiness and Diapause Initiation of Agromyza frontella (Rondani) (Diptera: Agromyzidae)

Author： THERRIEN PIERRE McNEIL JEREMY N. LACROIX SERGE

Publisher： Entomological Society of America

ISSN： 1938-2901

Source： Annals of the Entomological Society of America, Vol.78, Iss.2, 1985-03, pp. : 248-251

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Abstract

The supercooling-point values for field-collected and laboratory-reared alfalfa blotch leaf miner, Agromyza frontella, pupae were always below −25°C with no evident seasonal changes, as reported for other northerly freeze-intolerant species. Nondiapausing pupae were exposed to −10°C for 21 days at different stages of pupal development and then returned to 20°C. Some adults emerged, particularly from pupae placed at −10°C 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 to 10 h, at both 15 and 20°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°C (39.8%) than at 20°C (22.3%).