Comparison of the Hatch of Lymantria dispar (Lepidoptera: Lymantriidae) Eggs from Russia and the United States After Exposure to Different Temperatures and Durations of Low Temperature
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Annals of the Entomological Society of America. 89(4): 564-572.
Comparisons are made of the effects of temperature and duration of low temperature on egg hatch of North American and Russian gypsy moth, Lymantria dispar), under controlled laboratory conditions. Percentage of hatch of embryonated eggs, days to 1st hatch after incubation at warm temperature and temperal distribution of hatch are used to compare hatch of different strains under various conditions. Eggs from 2 Russian gypsy moth strains required less exposure to low temperature to be able to hatch than did eggs from a North American strain. Hatch took longer to begin and proceeded more slowly in eggs held at constant 15 and 20?C. Hatch did not occur for >99% of North American and Russian eggs held at a constant 25?C. Substantial variation in hatch in response to low temperature exists both within and between gypsy moth strains, making adaptation to a wide range of climates possible. Variation in diapause requirements within a strain and between strains can be assessed and compared by holding eggs for 60 d at 5?C followed by incubation at 25?C.
Keena, Melody A. 1996. Comparison of the Hatch of Lymantria dispar (Lepidoptera: Lymantriidae) Eggs from Russia and the United States After Exposure to Different Temperatures and Durations of Low Temperature. Annals of the Entomological Society of America. 89(4): 564-572.