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Management of the greenbug on grain sorghum. 2. Testing seed and soil treatments for greenbug and corn leaf aphid control



Management of the greenbug on grain sorghum. 2. Testing seed and soil treatments for greenbug and corn leaf aphid control



Journal of economic entomology 66(4): 953-959



In this second part of a series on the control of Schizaphis graminum (Rond.) and Rhopalosiphum maidis (Fitch) on grain sorghum in Texas [cf. preceding abstract], details are given of further field-plot tests carried out in 1969-70 to compare seed and soil treatments against the aphids. Applications of alidicarb to the seed furrow were effective when the toxicant was placed in direct contact with the seed at sowing, but were not effective when placed in a band 0.5 in. above the seed. Seed-furrow treatments with disulfoton in granules or liquids gave season-long control of Schizaphis and control of Rhopalosiphum for 6 weeks. Side-dressing with granular or liquid disulfoton was also effective against Schizaphis; however, the greatest control occurred 2-3 weeks after application. Combinations of seed-furrow and side-dressing application or seed-furrow and foliar-spray applications of disulfoton gave highly effective control of Schizaphis throughout the season. Phorate granules placed in direct contact with the seed in the furrow at sowing gave control of both pests for several weeks but significantly reduced plant stand. A combination of seed-furrow and foliar-spray applications controlled Schizaphis throughout the season. Monocrotophos as a seed treatment was ineffective. Some insecticidal treatments significantly reduced populations of insect and spider predators and Hymenopterous parasites, while others significantly increased seed yields (though this was not entirely due to control of the pests). Aphid damage to the aerial portions of plants was not significantly greater in untreated plots than in treated ones. There was no evidence for increased weight or seed size of harvested grain from treated plots, and the percentage of lodged plants at harvest was not related to earlier Schizaphis infestations.

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Accession: 016316723

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DOI: 10.1093/jee/66.4.953


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