Antifeedant bioassays of neem extract against the Carolina grasshopper, walkingstick, and field cricket,,
Titel:
Antifeedant bioassays of neem extract against the Carolina grasshopper, walkingstick, and field cricket,,
Auteur:
Adler, V. E. Uebel, E. C.
Verschenen in:
Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering
Paginering:
Jaargang 19 (1984) nr. 4 pagina's 393-403
Jaar:
1984-05
Inhoud:
A commercial preparation of neem extract, Margosine-O, was tested for its antifeedant activity against 3 adult orthopteran insects, Carolina grasshoppers, walkingsticks, and field crickets. Twenty μ1 of 1, 5, 10, 20, and 50% solutions of extract were applied to 2 × 2-cm corn-leaf squares in tests with the grasshoppers and crickets, and to 2 × 2-cm white oak-leaf squares in tests with walkingsticks. Concentrations of 10, 5, and 5%, respectively were necessary to produce a significant reduction in feeding on the mixed sexes of Carolina grasshoppers, female walkingsticks, and female crickets, respectively. The levels of neem extract necessary to inhibit feeding by these 3 species were many times greater than the concentrations reported to be effective for inhibiting feeding in the desert locust and African migratory locusts.
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