Laboratory and Field Evaluation of Bacillus sphaericus as a Mosquito Control Agent

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Abstract:

Bacillus sphaericus Neide strain 1593–4 was found to be more virulent against the southern house mosquito, Culex quinquefasciatus Say, and possessed longer residual activity than strain SSII-1 in pond tests at Fresno, CA. Furter testing of strain 1593-4 provided excellent control of a natural population of Culex tarsalis Coquillett in Kern County, CA, at 104 cells/ml. Infectivity of the bacterium on a mixed population of C. tarsalis and southern house mosquito was decreased in a treatment of a dairy drain. A WP formulation of 1593-4 improved handling of the material and resulted in operational control of C. tarsalis at 0.84 kg/ha (7.6×103 spores/ml). Effective control of a mixed population of Aedes melanimon Dyar and A. nigramaculis (Ludlow) was not obtained at 104 cells/ml in 0.02-ha pasture plots, although laboratory tests showed A. nigromaculis had a high susceptibility to the bacterium compared to other Aedes spp. A field test of strain 1593-4 showed no deleterious effect on non targets at 105 cells/ml. Fry of the mosquito fish, Gambusia affinis affinis (Baird and Girard), showed no adverse effect at 5 × 104 spores/ml of 1593-4 WP.

Document Type: Research Article

Publication date: October 15, 1978

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