Effects of Weeds on the Diversity and Abundance of Insects in Soybeans
نویسندگان
چکیده
Environ. Enlomol. 12: 2%-298 (1983) ABSTRACT Sweep-nel sampling and pilfalllrapping were used 10 survey insects in weedy and weedfree soybean habitals. Weedy soybean habitats consisted of (I) grassy soybeans; (2) soybeans with broadleaf weeds; and (3) soybeans with broadleaf weeds and grasses. Insect species diversity was greater in weedy soybean habitats than in weed-free soybeans. Greatest diversity of species occurred in Ihe mixed-weed soybean habitat. The most imponant phytophagous insect on soybeans in Indiana, the Mexican bean beetle, Epilachlla varivestis Mulsant, was mOSI abundanl in weed-free soybeans. Predators were mosl ahundanl in weedy soybeans. Coit'omeKilla marl/lata (DeGeer) was mllsl abundant in weedy soybean habitats, whereas Orius insidiosus (Say) and Nabis spp. were most abundant in soybean habitats with grasses and mixed weeds. In the pitfall trapping study, Harpalus spp. were more abundant in soybean habitats with grasses and mixed broadleaf and grass weeds.
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