Control of target spot of tomato with fungicides, systemic acquired resistance activators, and a biocontrol agent
Pernezny, K. | Collins, J. | Carroll, A. (University of Florida, Belle Glade (USA). Everglades Research and Education Centre) | Stoffella, P. | Beaney, A.
Control of target spot of tomato, caused by the fungus Corynespora cassiicola, was studied in three seasons in southern Florida, USA. The strobilurin fungicide azoxystrobin and a combination product of mancozeb and fumoxate provided excellent control of target spot. In these treatments, accumulated disease severity values were only 10-15 % of those in the untreated control and marketable yields were doubled. Excellent disease control also was achieved with acibenzolar-S-methyl, a systemic acquired resistance activator (SAR). This compound reduced defoliation of tomato plants by 42 % compared to the control. An experimental compound, BAS 510 02, provided good control of target spot, reducing defoliation by 40 % and increasing marketable yields by 34 %. Harpin protein and Bacillus subtilis strain QST 713 were not effective for control of target spot.
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