ISHS Acta Horticulturae 695: I International Symposium on Tomato Diseases
BAM! KICKING CONTROL OF TARGET SPOT UP A NOTCH |
| Authors: | K. Pernezny, P. Stoffella, N. Havranek, J. Sanchez, A. Beany |
| Keywords: | tomato, Lycopersicon esculentum, Corynespora cassiicola, strobilurin fungicides, biocontrol agents |
| Abstract:
Control of target spot of tomato, caused by Corynespora cassiicola, was studied in a field trial in the Fall of 2003 at Ft. Pierce, FL, USA. Spray programs that included famoxate, pyraclostrobin, or boscalid provided excellent control of target spot on tomato foliage. Estimates of the percentage of foliar damage due to target spot were about four times less when these compounds were applied in rotation with broad-spectrum fungicides compared to the untreated control. A pyraclostrobin/boscalid rotation resulted in a statistically significant doubling of marketable yield. The biocontrol agent QST 713 (strain of Bacillus subtilis) did not control target spot; addition of a proprietary surfactant did not improve efficacy of the QST 713. At the end of the experiment, defoliation ratings were about 75% in the control and QST 713 plots, and only 25-30% in the plots where famoxate, pyraclostrobin, or boscalid were used. These newer fungicides offer promise for use in rotation with broad-spectrum fungicides for integrated management of target spot. | |
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