Life cycle changes during 12 successive generations of laboratory colonisation of the leafroller Cnephasia jactatana (Walker) (Lepidoptera: Tortricidae) on artificial diet |
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| Authors: | J P R Ochieng'-Odero Pritam Singh |
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| Institution: | 1. Zoology Department , University of Auckland , Private Bag, Auckland , New Zealand;2. International Centre of Insect Physiology and Ecology (ICIPE) , P.O. Box 30772, Nairobi , Kenya;3. Landcare Research New Zealand Ltd , Private Bag, Auckland , New Zealand;4. Karta Technology Inc. , 1892 Grandstand, San Antonio, Texas , TX 78238 , U.S.A. |
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| Abstract: | Abstract Close monitoring of the lepidopteran leafroller Cnephasia jactatana under laboratory colonisation revealed few distinct effects of successive rearing on artificial diet on the life cycle. The second laboratory generation had a prolonged development time and altered sex synchronism in pupation and eclosion patterns. Some deleterious changes were observed in later generations, including decreases in fertility, egg hatch and sperm motility, failure of mating adults to separate, and pupal and adult malformations. These changes were not adaptive, but were due to incompatibility with the general purpose diet (GPD) used; they were absent under sub-colonisation on a sheepnut-bean based diet (SBD). Success in the laboratory colonisation of C. jactatana is attributed to a random mating protocol, choice of environmental conditions representing the wild habitat, and a rapid rate of population growth. |
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| Keywords: | Cnephasia jactatana black lyre leafroller Lepidoptera Tortricidae life cycle colonisation artificial diet rearing |
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