Evaluation of Provost 433SC and Elast for peanut disease control in southwest Alabama, 2008

摘要

Peanut cultivar ‘AT3085RO’ was planted on 20 May at the Gulf Coast Research and Extension Center near Fairhope, AL at a rate of five seed per ft of row in a field that had previously cropped to peanut production. The soil type was a Malbis fine sandy loam (OM <1%). Recommendations of the Alabama Cooperative Extension System for fertility and weed control were followed. Plots, which consisted of four 30-ft rows on 38 in. centers, were arranged in a randomized complete block with six replications. Plots were not irrigated. Infurrow fungicides were applied with a tractor mounted drop sprayer calibrated to deliver 15 gal/A. Foliar fungicides were applied at 14-d intervals as a full canopy spray using a four-row ATV mounted CO2 sprayer with three TX8 nozzles per row calibrated to deliver 15 gal/A. Early and late leaf spot as well as rust were visuallyrated on 24 Sep using the Florida leaf spot scoring system and the ICRISAT rust rating scale. Counts of stem rot (SR) loci were made on 25 Sep immediately after plot inversion (1 locus is defined as < 1 ft of consecutive symptoms and signs of the disease). Plots were harvested on 29 Sep and yields were reported at 10.0% moisture.