Abstract
The effect of planting date, cultivar, and state of soybean development on Nezara viridula (L.) population levels was determined by using five cultivars from different maturity groups planted on four dates ca. 2 weeks apart. Factors such as generation overlap, plant growth stage preferences for adult feeding and oviposition, and sex ratio fluctuations were also discussed in terms of soybean phenology. Oviposition by N. viridula was initiated during late vegetative stages of soybean, with peak oviposition occurring between R3 (beginning pod development) and early R5 (beginning podfill). More females than males were found in the earlier stages of soybean development. Third-generation southern green stink bugs developed in the early maturing cultivars, and fourth and fifth generations in the later-maturing cultivars. Stink bug population levels increased significantly during R3 and R4 (pod development). Greatest increases were observed during R5, and population levels generally peaked during R6 (late podfill). Cultivar and planting date significantly affected N. viridula population levels, but stage of soybean development was found to be the predominant factor affecting N. viridula populations in soybean.
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