Influence of larval food consumption on the fecundity of the lacewingChrysoperla carnea |
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Authors: | Y Zheng K M Daane K S Hagen and T E Mittler |
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Institution: | (1) Division of Biological Control, University of California, 94720 Berkeley, CA, USA;(2) Department of Entomological Sciences, University of California, 94720 Berkeley, CA, USA |
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Abstract: | The effects of food consumption on larval growth and development and adult fecundity of the common green lacewing,Chrysoperla carnea (Stephens), were studied on two populations of larvae derived from either a laboratory colony or from field-collected adults.
The number of eggs of the Mediterranean flour moth,Anagasta kuehniella (Zeller), provided to individual lacewing larvae was varied to produce three food-supply treatments: low, intermediate, and
high. Food-supply was found to influence larval growth and development and adult fecundity. Lacewing larvae provided with
an overabundance of moth eggs developed faster than larvae provided with fewer moth eggs than they could have consumed. Adult
females that developed from the high feeding treatment had a substantially shorter preoviposition period, a later decline
in egg deposition, and a significantly higher fecundity than adults arising from the other feeding classes. Unrestricted feeding
by adult lacewings on an artificial diet did not compensate for prior low feeding regimes. The overall performance of the
lacewings derived from the laboratory colony was substantially poorer than that of the lacewings derived from field-collected
adults. This effect was accentuated when the larvae were given a low food-supply. This overall decrease in vigor is attributed
to inbreeding of the laboratory culture over a one year period. These finds are relevant to mass rearing programs for this
biological control agent. |
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Keywords: | Neuroptera common green lacewing nutrition development fecundity inbreeding mass rearing |
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