Abstract
Abstract The toxicities of solutions of saturated straight chain fatty acids and the potassium soaps of 2 of them to RB larvae were evaluated in the laboratory. Fatty acids with 1-8 and 10 carbon atoms were bioassayed at concentrations of 50, 10 and 1 mg/liter in distilled water. Additionally, solutions of formic, butyric, propionic and capric acids and the potassium soaps of the last 2 acids were made up in water collected from a 2 wk previously flooded rice bay. The pH of the solutions ranged from 5.0-5.5. Each treatment consisted of a 25 ml aliquot of fatty acid solution in 25 mm diameter glass tube and was replicated 4 times. Ten late instar RB larvae from a laboratory colony were placed in each tube, capped and held at 25°C ± 2°C and assessed for mortality after 24 h. Appropriate untreated controls were maintained for each assay and all treatment results were corrected for control mortality. Larvae were counted as dead if they failed to respond to a jet of water.
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