Abstract
Sunflower species ( Helianthus ) were evaluated for resistance to a stem weevil, Cylindrocopturus adspersus (LeConte). In greenhouse tests, foliar feeding by C. adspersus adults was significantly less in 11 of 18 annual and in 13 of 34 perennial species tested than in commercial hybrid ‘894’. The number of C. adspersus larvae recovered was significantly lower in eight annual and all perennial species than in hybrid 894. Significantly fewer larvae of C. adspersus occurred in 27 perennial species of Helianthus in the field during 3 consecutive years (1981–1983) than occurred in nearby wild H. annuus L. or hybrid 894. However, the number of C. adspersus larvae found in F1 progeny of interspecific crosses between the wild species and cultivated hybrid parental lines in the field was equivalent to the number of larvae found in the cultivated parents.
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