ISHS Acta Horticulturae 504: VI Symposium on Stand Establishment and ISHS Seed Symposium
COMPARISON OF FUNGICIDE, SYSTEMIC ACQUIRED RESISTANCE INDUCERS AND MONOPOTASSIUM PHOSPHATE AS CONTROL MEASURES FOR SEEDLING DISEASES OF MUSKMELON, CUCUMBER, AND TOMATO |
| Authors: | Z.-X. Shen, G.E. Welbaum |
| Keywords: | priming, damping-off, powdery mildew, late blight |
| Abstract:
Recent research has shown that many plants have an immune system that naturally counteracts pathogenic attack. This natural systemic resistance is acquired by treatments that cause mild oxidative stress in plants. Resistance of muskmelon seedlings to Pythium was compared following: osmotic seed priming in 0.35 M monopotassium phosphate (MKP), -1.0 MPa polyethylene glycol, or 0.35 M MKP with systemic acquired resistance activators experimental compound X and Y added. Compound X, Y, and MKP were also compared with the commercial fungicide Bayleton (1-(4-Chlorophenoxy)-3,3-dimethyl-1- (1H-1,2,4-triazol-1-yl)-2-butanone) or Bravo Weather Stik (tetrachloroisophthalonitrile) for their control of powdery mildew on cucumber or late blight on tomato transplants in a greenhouse. Maximum emergence of untreated seeds was less than 20%. Priming in MKP alone increased seedling emergence by 19% in Pythium infected soil 11 d after seeding. The percent emergence was 80% for seeds primed in MKP + X, the highest of any treatment tested. Washing seeds after priming in MKP + X decreased the percent emergence to 47%. The emergence of seeds primed in MKP + Y was 44% after 11 d. Fungicide provided the most effective control of both powdery mildew and late blight. Monopotassium phosphate or compound Y had little effect on the spread of either disease. Spray treatments of X applied to cucumber and tomato seedlings improved resistance to powdery mildew and late blight, respectively. | |
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