Larvae of Dectes texanus LeConte may cause serious losses in sunflower-seed production in the southern Great Plains by their burrowing in and internal girdling of stalks. Planting sunflower before mid-April or after late May at Bushland, Tex., significantly reduced stalk infestation by D. texanus larvae. A single disk or sweep tillage of sunflower stubble in October or January caused up to 73.5 and 39.7% mortality of overwintering larvae, respectively. Overwintering larvae began pupating in late May 1982 and mid-June 1983, with subsequent adult emergence beginning from mid- to late June. Commercial varieties and hybrids of sunflower and their F1 progeny from interspecific crosses with wild Helianthus species did not have acceptable levels of resistance to D. texanus larvae. Perennial species of Helianthus have a high level of resistance against stalk injury by larvae of D. texanus.
Document Type: Research Article
Publication date: October 1, 1985
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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.