Candidate Materials to Replace Heptachlor as a Selective Control for the Egyptian Alfalfa Weevil in Southern California1

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Abstract:

Parathion will control the larvae of the Egyptian alfalfa weevil, Hypera brunneipennis (Boheman), when applied at 4 ounces per acre. However, this compound is highly, toxic to the beneficial insects mentioned below and therefore is undesirable from the standpoint of integrated control. Guthion® (0,0- dimethyl S-( 4-oxo-1,2,3, benzotriazin-3-( 4H)-ylmethyl) phosphorodithioate) gave good initial control of the weevil larvae when applied at 4 ounces per acre but does not have the residual action to suppress an increasing population. Phosdrin® (a mixture of the alpha isomer of 2-carbomethoxy-1-methylvinyl dimethyl l phosphate (not less than 60%) and related compounds (not more than 40%)) at 4 ounces, ronnel at 8 ounces, Dibrom® (1,2-dibromo-2,2-dichloroethyl dimethyl phosphate) at 15.5 ounces, and dimethoate at 4 ounces per acre gave mediocre control of the weevil larvae. Parathion at 4 ounces, Guthion at 9 ounces, and dimethoate at 4 ounces per acre were quite toxic to the following important predators: Hippodamia convergens Guérin-Méneville, Orius tristicolor (White), and Nabis ferus (L.); and also to the following hymenopterous parasites: Praon palitans Muesebeck, Therioaphis maculata Muesebeck, Aphelinus semiflavus Howard, which attack Therioaphis maculate (Buckton), and the newly introduced pea aphid parasite Aphirlius smithi Sharma and Rao. Methoxychlor applied at 8 ounces per acre by ground equipment, and 12 ounces per acre by airplane, gave satisfactory control of the weevil larvae. Most of the predators and parasites survived treatment even at the higher dosage of methoxychlor.

Document Type: Research Article

Publication date: October 1, 1962

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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