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Efficacy of Bacillus sphaericus formulations against Psorophora columbiae larvae in small rice plots. 1990

D E Bowles, and M V Meisch, and A A Weathersbee, and J W Jones, and P Efird, and D Bassi
Department of Entomology, University of Arkansas, Fayetteville 72701.

Bacillus sphaericus formulations were evaluated against Psorophora columbiae larvae in small rice plots. All formulations tested provided good control (greater than 84%) for all rates tested at 2 days posttreatment. At 10 days posttreatment, fair control (greater than 70%) was recorded for ABG-6232 (0.184 kg/ha), ABG-6262; 27-242-BA (0.766 and 2.298 liters/ha), and ABG-6262; 29-293-BA (2.298 liters/ha). At 7 days posttreatment mortality was below 66%. Control did not exceed 27% at 15 days posttreatment for any formulation tested. Application rates for all formulations tested had little relationship with observed mortality, and control levels often were greater at the lower dosages tested. Bacillus sphaericus provided an effective means for controlling Ps. columbiae, but additional research is needed to determine the lower limit of effective treatment dosages and spore persistence in the rice field environment.

UI MeSH Term Description Entries
D007814 Larva Wormlike or grublike stage, following the egg in the life cycle of insects, worms, and other metamorphosing animals. Maggots,Tadpoles,Larvae,Maggot,Tadpole
D009033 Culicidae A family of the order DIPTERA that comprises the mosquitoes. The larval stages are aquatic, and the adults can be recognized by the characteristic WINGS, ANIMAL venation, the scales along the wing veins, and the long proboscis. Many species are of particular medical importance. Mosquitoes,Mosquitos,Mosquito
D010572 Pest Control, Biological Use of naturally-occuring or genetically-engineered organisms to reduce or eliminate populations of pests. Biological Pest Control,Biologic Pest Control,Pest Control, Biologic,Biologic Pest Controls,Biological Pest Controls,Pest Controls, Biologic,Pest Controls, Biological
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001407 Bacillus A genus of BACILLACEAE that are spore-forming, rod-shaped cells. Most species are saprophytic soil forms with only a few species being pathogenic. Bacillus bacterium
D012275 Oryza A genus of grass family (Poaceae) that include several rice species. Oryza sativa,Rice,Rices

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