Effects of the stages of bloom and selected insecticides on the control of the sorghum midge (Contarinia sorghicola)
Stanford, Robert Leland
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The sorghum midge, Contarinia sorghicola (Coquillet), has established itself as a yearly threat to the success of grain sorghum production in West Texas. Significant losses in sorghum yield from the midge and the lack of efficient control measures have forced early planting of most sorghum varieties. When weather conditions do not permit early planting, the farmer will usually choose a shorter-season variety rather than attempt to control the sorghum midge on a longer-season variety with a much higher yield potential. The higher yield from varieties in which the heads emerge later in the summer months is due in part to cooler nights, less extreme day temperatures, and more rainfall at critical stress periods. Better use can be made of the irrigation water supply by delaying or alternating, some of the sorghum plantings on a farm. Without effective and economical midge control a farmer must plant early or use varieties which bloom before August. Several tests have shown that any sorghum blooming after July most likely will be attacked by the midge.