ISHS Acta Horticulturae 695: I International Symposium on Tomato Diseases
POSSIBILITIES FOR CONTROL OF TOMATO PITH NECROSIS BY USING COPPER COMPOUNDS AND PLANT ACTIVATORS |
| Authors: | N. Ustun, G. Demir, H. Saygili |
| Keywords: | tomato pith necrosis, copper, acibenzolar-S-methyl, harpin, ISR 2000 |
| Abstract:
Tomato pith necrosis, incited by different bacterial pathogens, causes serious losses to greenhouse growers in Turkey. The disease is difficult to control. Up to now only cultural practices are recommended for preventing the disease. The objective of this study was to evaluate the possibilities for controlling the disease by using copper compounds and plant activators that induce systemic acquired resistance in plants. Experiments were conducted in plastic greenhouse in 2001 and 2002. Seedlings of cultivar Fantastic 144 were transplanted in the greenhouse. Two months after transplanting the plants were artificially inoculated with bacterial suspension (108 cfu/ml) of Pseudomonas cichorii, one of the possible causal agents, by spraying the suspension onto the pruning sites. Tested copper compounds, including copper hydroxide (Champion), copper salts combined with mancozeb (Tri-Miltox), copper salts of oil and rozin acids (Tenn-copp), and copper penta hydroxide (Mastercop), were sprayed on the pruning sites 3-4 hours prior to inoculation. Plant activators, including harpin (Messenger), plant and yeast extracts (ISR 2000), and acibenzolar-S-methyl (Bion), were applied two times, five days prior to inoculation and on the day of inoculation. Experimental plots were laid out in a randomized complete block design with three replications. Evaluation was based on disease incidence rated as the percentage of diseased plants per plot. In both years, copper hydroxide was effective in disease reduction (72% in 2001 and 66% in 2002). Plant activators resulted in disease reductions ranging from 58% for acibenzolar-S-methyl to 20% for harpin. | |
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