Abstract
The effects of a new carbamate (thiodicarb) insecticide, UC-51762 or Larvin (O-[[N-[N′-(methylthiothylideneiminoxycarbonyl)-N′-methylaminosulf enyl]-N-methylcarbamoyl]]-S-methylacetothiohydroximate), on some nontarget aquatic invertebrates in experimental and sewage ponds were studied. The insecticide at 0.25, 0.5, and 1.0 kg AI/ha (i.e. 0.055, 0.11, and 0.22 ppm, respectively) in experimental ponds affected populations of Rotifera, Cyclops spp., Daphnia sp., Ostracoda, Chaoborus sp., Baetis sp., coleopteran larvae and chironomid larvae. In a sewage pond, at 1.0 kg AI/ha (0.085 ppm), Cyclops sp., Ostracoda, Hyalella azteca (Saussure), and chironomid larvae were affected. The adverse effects of the carbamate insecticide on the invertebrates in both types of habitats were moderate and generally of a short duration. /// Se estudiaron les efectos de un nuevo carbamato, UC-51762, o LarvinR, sobre unos invertebrados aquáticos, los cuales no son objetos de control químico, en charcas experimentales y de aquas negras. El insecticida aplicado a 0.25, 0.5 y 1.0 Kg. AI/ha (i.e., 0.055, 0.11 y 0.22 ppm., respectivamente) en las charcas experimentales afecto las poblaciones de Rotifera, Cyclops spp., Daphnia sp., Ostracoda, Chaoborus sp. Baetis sp. y larvas de coleopteros y de chironomidos. En charcas de aquas negras Cyclops sp., Ostracoda, Hyalella azteca (Saussure), y larvas de chironomidos fueron afectados por el insecticida a 1.0 Kg. AI/ha (0.085 ppm). Los efectos adversos del insecticida carbamato sobre los invertebrados en ambas clases de habitat fueron moderados y generalmente de una duración corta.