Abstract
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 .
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