Effects of cold storage on adult emergence and fecundity of Choristoneura occidentalis (Lepidoptera: Tortricidae)
The effects of cold storage on Choristoneura occidentalis Freeman pupae, in darkness at 2.0 ± 0.5°c and 100% R.H. for 0 to 10 weeks, were determined on adult emergence, adult longevity, the number of eggs laid per female, and egg viability in the laboratory. The proportion of adults emerging was not significantly reduced after pupae were stored in the cold room for up to 2 weeks. No adults emerged from pupae being stored for 8 weeks or longer. The lifespan of adult females was longer than that of males. The differences in adult longevity between the two sexes increased after pupae were exposed to cold storage. Cold storage of C. occidentalis pupae significantly reduced adult longevity: longer pupal storage resulted in a shorter adult lifespan. After 1 week of cold storage of the pupae, the mean number of eggs laid per female and egg viability were not significantly reduced as compared with those for females not exposed to cold storage as pupae. Egg production and egg viability, however, were significantly reduced when pupae were subjected to cold storage for 2 weeks or longer. Considering all the parameters measured, pupae may be exposed to cold storage for 1 week without deterioration in adult quality.
Key words: Choristoneura occidentalis; cold storage; adult longevity; fecundity
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