Insect Developmental Inhibitors. 3. Effects on Nontarget Aquatic Organisms

Acute, short-term toxicity of ZR-515 (isopropyl 11-methoxy-3,7,11-trimethyl-2,4-dodecadienoate) on various aquatic organisms was studied. In the laboratory, 35 organisms including Protozoa, Platyhelminthes, Rotatoria, Annelida, Arthropoda, Mollusca, Chordata, and Thallophyta were tested with technical ZR-515. Dosages used for mosquito larvae control produced no adverse effect on most of the organisms tested. In the field (artificial containers, ponds, and irrigated pastures), a slow-release formulation was used with no visible effect on most of the nontarget organisms. However, larvae of aquatic Diptera (Chironomidae, Ephydridae, Psycodidae) showed some sensitivity.