Field Evaluation of Bacillus thuringiensis for Control of Navel Orangeworms on Almonds

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Field trials with Bacillus thuringiensis Berliner for control of paramyelois transitella (Walker) were conducted in commercial almond orchards in California. B. thuringiensis formulated as Dipel® (2% dust and WP), Thuricide® HPC (EC), and Biotrol® XK (WP) was applied starting at about the onset of hullcrack for 4–5 applications at 3–10 day intervals. A synthetic feeding stimulant, Mo-Bait,® also was tested. The highest level of control (44.8% damage reduction) was obtained with 4 applications of Thuricide HPC at a rate of 1 qt/25 trees. The addition of the feeding stimulant did not increase the effectiveness of the treatments. Navel orangeworms are difficult to control because they apparently move to the deeper areas of the hull-shell interspace that are not penetrated by the treatments.

Document Type: Research Article

Publication date: June 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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