Journal of Economic Entomology (1949) 42, 135-142

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C.J. Weinman and G.G. Decker (1949)
Chlorinated: hydrocarbon insecticides used alone and in combinations for grasshopper control
Journal of Economic Entomology 42 (1), 135-142
Abstract: During 1948, 6 chlorinated hydrocarbons and 3 organic phosphates were tested against Melanoplus differentialis in the field. Of these materials I and II were of outstanding effectiveness at dosages of 2-4. oz. of pure compound per acre, II showing a 1.0 longer residual effectiveness than I, chlordane, parathion, or gamma BHC. No evidence of repellent action could be seen in plants sprayed with II or, parathion. Cage tests with alfalfa indicated that the toxic action of plants sprayed with II began to show a reduction after 10-14 days, and that they lost practically all toxicity after 21 days. All the compounds tested in the field together with III were included in laboratory tests. Parathion, with a median lethal dose of 8 micrograms per gm. body weight showed the greatest contact toxicity, followed closely by Ill., I, II (1.4 - 1.8), gamma BHC (3.4) and chlordane (9.8 micrograms). As a stomach poison II was the most- toxic (with a median lethal dose of 2.3 micrograms per gm.) with III, I, gamma BHC and parathion (8.9) falling in the same range. Tests of combinations of certain of the chlorinated hydrocarbons indicated no strong synergism nor antagonism, although some evidence of slight synergism was apparent in mixtures of DDT chlordane and of DDT and II; within the narrow limits of this experiment, the greater the ratio of DDT to chlordane or II, the greater the synergism, at least in contact effect.
(copied from Acridological Abstracts with permission by Natural Resources Institute, University of Greenwich)

Research topic(s) for pests/diseases/weeds:
control - general

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Melanoplus differentialis