Abstract
Abstract Two tests planted in Cecil loamy soil were utilized to evaluate the effectiveness of several materials in controlling the sorghum midge. Test 1 was planted on Jun 28’79 by conventional tillage methods with Funk’s G522DR. Test 2 was planted on Jul 27’79 by minimum tillage behind corn with Funk’s G399DR. All plots were 6.1m × 3 rows and separated by 1 untreated row or 1-m alleys. Treatments were replicated 4 times in a RCB design. Pretreatment numbers of adult midges were determined by careful inspection of 60-75 blooming heads randomly scattered over the treatment plots. Applications were made with a compressed-air sprayer calibrated to deliver 40 gal water/acre. Spray was directed to each side of the heads by walking along each side of a row. Two applications 3 days apart (Aug 24’79, Aug 27’79) were required in Test 1 due to numbers of adult midges on flowering heads (9.8/head and 2.8/head, respectively). One application on Oct 1’ 79 was required in Test 2 (0.7 midges/head). Ten days after application 10 heads were clipped and placed in bags for later counting of emerged midge adults. Twenty heads from each plot were rated for midge damage 3-4 weeks after treatment. Yield samples were obtained in Test 1; however, cool temperatures prevented grain maturation in Test 2.
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