Onion maggot feeding and development on heterogeneous sections of the onion bulb |
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Authors: | W. D. Schneider M. O. Harris J. R. Miller |
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Affiliation: | (1) Department of Entomology, Michigan State University, 48824 East Lansing, MI, USA;(2) Pesticide Research Center, Michigan State University, 48824 East Lansing, MI, USA;(3) Present address: Zoecon Corporation, 915 California Avenue, 94306 Palo Alto, CA, USA |
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Abstract: | When given a choice of feeding sites in laboratory arenas, Delia antiqua (Meigen) larvae exhibited a 3: 1 bias for internal vs outer sections of onion bulbs and distributed themselves non-randomly among identical preferred onion sections. Larval clustering did not appear to be correlated with increased fitness in the laboratory; larval development was identical across the range of densities from 1 to 50 larvae per onion. Larvae feeding on preferred internal sections developed 14% faster, were 38% heavier upon pupation, and were two times more likely to survive to the adult stage than larvae feeding on outer sections. D. antiqua larval food preference was therefore positively correlated with increased fitness. |
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Keywords: | Onion maggot onion fly Delia antiqua feeding preference Allium cepa plant nitrogen insect/plant interactions |
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