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A replicated greenhouse study was conducted to confirm the availability of resistance to western Rower thrips in pepper germplasm. Host-plant resistance ratings confirmed earlier observations that there is a considerable amount of variability within pepper germplasm for reaction to F. occidentalis. Plants of 'Keystone Resistant Giant', 'Yolo Wonder L', 'Mississippi Nemaheart', 'Sweet Banana', and 'California Wonder' were resistant to the insect and exhibited only mild symptoms of damage. Plants of 'Carolina Cayenne', 'Santaka', and 'Bohemian Chili', however, exhibited the symptoms of severe thrips damage, i.e., poorly expanded, deformed, and distorted leaves; greatly shortened internodes; and severe chlorosis. The resistance to F. occidentalis in pepper appears to be due to tolerance mechanisms, not antixenosis (nonpreference) or anti- biosis mechanisms. Thrips-resistant cultivars could be used as a cornerstone in an integrated pest management program for greenhouse pepper production. Western flower thrips are tiny insects that can cause severe losses to a wide range of crops (Mantel, 1989). The insect is consid- ered to be one of the most serious green- house pests of ornamental and vegetable crops in Europe (vanLenteren and Wardlow, 1989).

Resistance in Pepper (Capsicum annuum L.) to Western Flower Thrips [Frankliniella occidentalis (Pergande)]