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MANNER OF PICKUP OF ACEPHATE BY MELANOPLUS OCCIDENTALIS (ORTHOPTERA: ACRIDIDAE) FROM AERIALLY SPRAYED RANGELAND

Published online by Cambridge University Press:  31 May 2012

R. Nelson Foster ,
K. C. Reuter ,
J. G. Kinzer  and
J. M. Fischer
R. Nelson Foster
Affiliation:
Pink Bollworm and Range Pests Station, U.S. Department of Agriculture, Phoenix, Arixona 85040
K. C. Reuter
Affiliation:
Pink Bollworm and Range Pests Station, U.S. Department of Agriculture, Phoenix, Arixona 85040
J. G. Kinzer
Affiliation:
Pink Bollworm and Range Pests Station, U.S. Department of Agriculture, Phoenix, Arixona 85040
J. M. Fischer
Affiliation:
Pink Bollworm and Range Pests Station, U.S. Department of Agriculture, Phoenix, Arixona 85040
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Extract

Since 1978 several experiments with aqueous formulations of acephate have demonstrated its potential as an effective and economical control agent for grasshoppers on rangeland (Onsager and Mazuranich 1979; Foster et al. 1981a,b). While it has been generally accepted that grasshopper mortality arises primarily from the ingestion of acephate (Chevron Chemical Co., unpub. data), the extent of the mortality attributable to direct deposition of the spray on the insect or ingestion of the spray remains undefined. The following experiment was conducted to determine grasshopper mortality levels for the methods of exposure (ingestion of sprayed vegetation, direct deposition of the spray on the insect, and a combination of ingestion and direct deposition) which result from an aerial treatment of rangeland with acephate. Any mortality attributable to contact between the insect and sprayed vegetation or ground was not determined because of difficulties in preventing the insects from feeding while being exposed to sprayed vegetation. Studies with malathion, another organophosphate used for grasshopper control, showed that sprayed soil contributed minimally to the total mortality of grasshoppers (Pfadt et al. 1970).

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 8 , August 1984 , pp. 1149 - 1151
Copyright
Copyright © Entomological Society of Canada 1984

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