Effects of Peanut Row Pattern, Cultivar, and Fungicides on Control of Southern Stem Rot, Early Leaf Spot, and Rust

Abstract Field trials were conducted in Texas during 2001 at Pearsall and 2002 at Yoakum to determine cultivar responses to certain foliar and soilborne diseases in single row (91 cm) vs. twin-row (rows spaced 18 cm on 91-cm centers) patterns and sprayed four times with tebuconazole at 0.23 kg ai/ha or twice with azoxystrobin at 0.34 kg ai/ha. Azoxystrobin and tebuconazole controlled southern stem rot similarly. Tebuconazole controlled rust more effectively than azoxystrobin. In 2002, early leaf spot severity was high and disease control was less than desirable with both fungicides, but still better than the nontreated plots. Both fungicides reduced early leaf spot severity in the single and twin-row patterns when compared to nontreated plots. Early leaf spot severity in the nontreated plots was greater in the twin-row pattern compared to the single row pattern. Tamrun 96 yielded better than any of the other cultivars in the study and showed less southern stem rot than all other cultivars when averaged ac...