Effects of host instar and size on parasitization efficiency and life history parameters ofOpius dissitus |
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Authors: | F L Petitt and D O Wietlisbach |
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Institution: | (1) The Land, EPCOT Center, 32830 Lake Buena Vista, FL, USA |
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Abstract: | The braconid parasitoidOpius dissitus Muesebeck (Hymenoptera, Braconidae) produced 1.7 to 3 times more offspring when provided second and third instar leafminers
(Liriomyza sativae Blanchard) as compared to first instars. Females arising from parasitization of different instars did not differ significantly
in numbers of chorionated eggs in their ovaries at adult eclosion. Development time was prolonged by about two days when parasitoid
oviposition occurred in first, as compared to third instar hosts. Parasitoid length was positively correlated with host weight
(r2=0.75). Because only 7% of variation in host weight could be explained by host density, parasitoid length varied considerably
among hosts reared at the same density. Longevity and lifetime fecundity of parasitoids were inversely related to the weight
of their hosts. |
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Keywords: | Agromyzidae Braconidae Liriomyza host size host instar sex ratio development longevity fecundity |
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