From green to yellow or yellowish white: egg‐color changes in relation to oviposition rank in the fir budworm Choristoneura murinana (Hb.) (Lep., Tortricidae)
1991
Merle, P du | Brunet, Sylvie
Choristoneura murinana (Hb.) females successively deposit green, then yellow‐green and finally yellow or occasionally even yellowish white egg clusters when their egg‐laying activity is not interrupted by premature death. Some individuals lay yellow‐green egg clusters from the outset and the color succession of their eggs is thus limited to the “yellow‐green, yellow” sequence. The production of a reduced number of yellow egg clusters, a total absence of such clusters and a total absence of both yellow and yellow‐green clusters are criteria which make it possible to diagnose that death occurred more and more prematurely compared to the females' reproductive potential. Females reared without food all died before reaching the “yellow egg clusters” stage. When compared to all the egg clusters laid by the budworm during one season in a forest stand, the percentage of yellow clusters can be greater than 20%. Average sterility of the yellow eggs obtained in the laboratory was higher than normal.
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