Abstract
A 2-year (1978–1979) date of planting study with cultivated sunflower, Helianthus annuus L., showed that adult populations of a stem weevil, Cylindrocopturus adspersus LeConte, were higher on early-planted sunflower and decreased significantly ( P < 0.10) on later-planted sunflower. Damage to sunflower stalks by C. adspersus larvae decreased significantly ( P < 0.10) with each 2-week planting delay. Oil content showed a weak association with planting date. The earliest planted sunflower in 1979 had the highest seed weight, whereas data for 1978 showed that the second or third planting dates had the highest seed weight.
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