Abstract
Overwintering survival of the sunflower stem weevil (SSW), Cylindrocopturus adspersus (LeConte), varied with microhabitat of the larvae. Survival was significantly higher for larvae protected within the sunflower stalk compared with larvae exposed in the soil. Survival ranged from 11.9 to 68.4%, 9.2 to 58.6%, and 3.7 to 33.2% during the fall-winter seasons of 1981-1982, 1982-1983, and 1983-1984, respectively. Nealiolus curculionis (Fitch) and Tetrastichus ainsliei Gahan parasitized 10.6, 7.0, 29.8%, and 0.6, 1.2, 0.3% of the SSW larvae recovered from stalks collected in the fall in 1981-1982, 1982-1983, and 1983-1984, respectively. Microhabitats favoring SSW survival also favored parasitoid survival.
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