Duration of Control of the Strawberry Aphid by Several Chemicals1

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Abstract
Several chemicals were tested to determine their residual activity against the strawberry aphid, Pentatrichopus fragaefolii. Endosulfan, menazon (S-[(4,6-diamino-s-triazin-2-yl) methyl] O,O-dimethyl phosphorodithioate)), Rhone-Poulenc RP-10,465 (N-methyl (0,0-dimethylthiolophosphoryl)-5 thio-3 methyl-2 valeramide), and methyl demeton all provided 85-99% control for 3-5 weeks. Diazinon was equal to these chemicals in April but was inferior in a June trial. Dimethoate and phosphamidon gave good initial control but of short duration. Guthion (O, O-dimethyl S-(4-oxo-l,2,3-benzotriazin-3-(4H)-ylmethyl) phosphorodithioate), carbophenothion, and demeton gave less control than the above chemicals, and endrin, Zectran (4-dimethylamino-3,5-xylyl methylcarbamate), naled, and Imidan (O, O-dimethyl s-phthalimidomethyl phosphorodithioate) gave poor control. An entire strawberry field was treated with endosulfan at 1/2 pound actual per acre on April 11, May 25, and June 19 to eliminate reinfestation from untreated rows in the field. The total number of aphids found on 60 leaves ranged from 0 to 32 between applications compared with a high of 2044 aphids from 80 leaves in an untreated field.

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