Greenbug Control on Grain Sorghum and the Effects of Tested Insecticides on Other Insects

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A new biotype of Schizaphis gramimun (Rondani) caused severe and widespread damage to sorghum, Sorghum bicolor (L.) Moench, in the summer of 1968. Screening tests and refinement of application rate studies were conducted in 1968 and 1969 to determine if compounds used in greeubug control on wheat could be used effectively also against this biotype. The most feasible chemicals, considering both insecticidal and nonphytotoxic properties, were disulfoton, parathion, diazinon, demeton, and ULV malathion. Carbophenothion, although somewhat slower acting, was also usually very effective. Supracide® (S-((2-methoxy-5-oxo-Δ2-l,3,4-thiacliazolin-4-yl) methyl) O,O-dimethyl phosphorodithioate), while not very effective in the 1968 studies, significantly reduced greeubug populations in the 1969 tests.

Most of the insecticides were found to give reductions also in populations of the corn leaf aphid Rhopalosiphum maidis (Fitch). Fall armyworm, Spodoplera frugi-perda (J. E. Smith), and flea beetle population differences following insecticidal treatments were not significant.

Of the beneficial insects monitored, the primary species present were the convergent lady beetle, Hippodamia convergens Guérin-Méneville, and various parasitic Hymenoptera. In general the more effective the insecticide in controlling the greenbug, the greater its suppressive effect Avas on beneficial insect populations. However, demeton applied at 0.5 lb active ingredient per acre gave satisfactory greenbug control and spared much of the beneficial insect population.

Document Type: Research Article

Publication date: December 15, 1970

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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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