Co-Authors:
Neubauer, I., Division of Chemistry of Pesticides and Natural Products, Agricultural Research Organization, Volcani Center, Bet Dagan, 250, Israel
Aharonson, N., Division of Chemistry of Pesticides and Natural Products, Agricultural Research Organization, Volcani Center, Bet Dagan, 250, Israel
Ishaaya, I., Division of Entomology, Agricultural Research Organization, The Volcani Center, Bet Dagan, 50 250, Israel
Raccah, B., Division of Virology, Agricultural Research Organization, Volcani Center, Bet Dagan, 50 250, Israel
Soroksi, L., Division of Chemistry of Pesticides and Natural Products, Agricultural Research Organization, Volcani Center, Bet Dagan, 250, Israel
Abstract:
A study was made of the accumulation of aldicarb, ethiofencarb and dimethoate in citrus leaves and fruit; the toxicity of these insecticides to the spirea aphid (Aphis citricola Van der Goot) was also studied. The effectiveness of the treatments was affected mainly by the rate of accumulation of the toxicant in the leaves. At 18 g a.i. per tree, the greatest residues found in the leaves were 106, 12.2 and 1.3 μg 8−1 fresh weight for aldicarb, ethiofencarb and dimethoate, respectively. The concentration in mature leaves was very similar to that in young leaves. The residue levels in the mature fruits were much lower than in the leaves. The main components of the residues in the leaves were aldicarb sulphoxide [2‐methyl‐2‐(methylsulphinyl)‐ propionaldehyde O‐methylcarbamoyloxime], dimethoate, omethoate and ethiofencarb sulphoxide [2‐(ethylsulphinylmethyl)phenyl methylcarbamate]. A laboratory study with synthetic diets showed similar toxicity for all three insecticides, whereas in detached leaves, or when taken up by citrus trees, ethiofencarb was the least toxic to the aphids. Copyright © 1982 John Wiley & Sons, Ltd
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