Field Tests for the Control of Certain Alfalfa Insect Pests in New York

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Abstract
Field trials were made from 1958 to 1961 for the control of certain forage insect pests on alfalfa. The pea aphid, Macrosiphum pisi (Harris), was effectively controlled by most organic phosphate insecticides, some at relatively low levels. A number of insecticides gave good control of the potato leafhopper, Empoasca fabae (Harris), 3 days after application, but only methoxychlor and dimethoate were effective after 7 days. Triathlon® (O,O-diethyl S-p-chlorophenylthiomethyl phosphorodithioate), Guthion® (O,O-dimethyl S-(4-oxo-1,2,3-benzotriazin-3-(4H)-ylmethyl) phosphorodithioate) and dimethoate at 1.0 pound and heptachlor, endrin, lindane and parathion at 0.25 pound per acre showed good control of various grasshopper species even at 14 days after treatment. Control of adults of the meadow spittlebug, Philaenus spumarius (L.), was obtained with numerous materials, the best of which were endrin, lindane, and Phosdrin® (a mixture of the alpha isomer of 2-carbomethoxy-I-methyl vinyl dimethyl phosphate (not less than 60%) and related compounds (not more than 40%)) at 0.25 pound, and methoxychlor and Guthion at 1.0 pound per acre. The phytotoxic nature of some of the organic phosphate materials, especially Guthion, to alfalfa plants will undoubtedly limit their use for forage insect control.

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