Effects of Hypera nigrirostris, Hylastinus obscurus, and Sitona hispidula Populations on Red Clover in Southwestern Idaho1

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Thc lesser clover leaf weevil, Hypera nigrirostris (F.), was shown to have little effect on red clover seed yields in Idaho. The clover root borer, Hylastinus obcurus (Marsham) , and the clover root curculio, Sitona hispidula (F.) , lowered both the longevity and seed yields of red clover fields. A high population of these beetles usually resulted in un thrifty stands and in a lowering of expected yields. Populations of these 2 root-damaging species were rather closely correlated with the number of roots expressing disease symptoms. In the first seed crop year, spring-planted red clover fields generally had higher populations of all 3 beetles than fall-planted fields. Granular forms of heptachlor and dieldrin were used to manipulate the insect populations in this study.

Document Type: Research Article

Publication date: December 1, 1964

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