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Bacillus thuringiensis and Pirimicarb: Selective Insecticides for Use in Pest Management on Broccoli

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The effectiveness and selectivity of the combination Dipel® (Bacillus thuringiensis Berliner var kerstaki) plus pirimicarb® for control of the complex of lepidopterous larvae [Trichoplusia ni (Hubner), Pieris rapae (L.), and Plulella xylostella (L.)], and aphids [Brevicoryne brassicae (L.) and Myzus persicae (Sulzer)] attacking broccoli were evaluated on 5 different plantings at 2 locations in southern California.

During the preheading stage of plant growth, Dipel 1.0 Ib + pirimicarb 0.25 lb AI/acre, applied as needed, significantly reduced lepidopterous larval and aphid populations. However, control of larvae was less consistent than that by methomyl at 0.9 lb AI/acre. Weekly applications of Dipel 1.0 Ib + pirimicarb 0.25 lb during head formation were as effective as methomyl 0.45 lb in preventing insect contamination of the heads. B. brassicae was consistently the most serious insect contaminant of the broccoli heads.

The effects of the Dipel + pirimicarb and methomyl treatments on parasitization of T. ni and P. xylostellaat 14 days posttreatment were minimal. At 6 and 7 days posttreatment, Dipel + pirimicarb interfered less with parasitization than did methomyl.

Document Type: Research Article

Publication date: December 1, 1976

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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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