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Oviposition and Development of the Navel Orangeworm in Relation to Almond Maturation

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Under orchard conditions, oviposition by Paramyelois transitella (Walker) begins on maturing almond fruit just prior to initiation of hull-split. After hull-split is complete, half the eggs are laid within the opened area on the inside of the hull or on the exposed shell, the rest on the outside of the hull. Moths preferentially oviposit on previously infested fruit, as compared with uninfested fruit. Infestation develops explosively after dehiscence begins. Most of the larvae hatching during the early stages of hull-split infest the nutmeat directly rather than feeding on the hull. Preventive treatments during this period should be applied before significant hull-split has taken place. Development of the navel orangeworm in new crop fruit in situ was followed by sampling 3 cohorts of dehiscing fruit artificially infested with eggs of a known age. By applying data developed on width of the larval head capsule to these populations, sampled in sequence, development was charted providing estimates of stadial length. First emergence from the new crop occurred in 29 days, in time to cause reinfestation. Fifty % emergence occurred in 42–45 days,

Document Type: Research Article

Publication date: August 1, 1977

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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