Abstract
Dichlorvos impregnated in polyvinyl chloride granules coated with rodent bait was evaluated as a vapor toxicant for control of fleas on several rodent species in 2 field tests conducted in southeast New Mexico. In the 1st test, the application of 22.8 g/ha actual dichlorvos throughout a 6.3-ha grid resulted in control of fleas by 18 days posttreatment. In the 2nd test, the application of 385.1 g/ha actual dichlorvos throughout a 15.8-ha grid resulted in control of fleas, but not until after 43 days posttreatment. In both tests, effective flea control was demonstrated only on Dipodomys spectabilis , probably because of its habit of storing food extensively in its burrow. The D. spectabilis flea populations in the treated areas showed no significant recovery until about 1 year later. Some control of fleas was demonstrated on D. ordii in the 2nd test, although to a lesser extent than on D. spectabilis . Flea control was not demonstrated on the other rodent species involved in these tests, probably because they did not store sufficient quantities of the vapor toxicant in their burrows.
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