Effect of acetochlor treatment on Fusarium wilt and sugar content in melon seedlings |
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| Authors: | R Cohen B Blaier A A Schaffer J Katan |
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| Institution: | (1) Dept. of Vegetable Crops, Agricultural Research Organization, Newe Ya'ar Research Center, P.O.Box 90000, 31900 Haifa, Israel;(2) The Volcani Center, 50250 Bet Dagan, Israel;(3) Department of Plant Pathology and Microbiology, Faculty of Agriculture, The Hebrew University of Jerusalem, 76100 Rehovot, Israel |
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| Abstract: | Pretreatment of soil with the herbicide acetochlor at 0.1–1 g g–1 significantly decreased incidence of wilt due toFusarium oxysporum f. sp.melonis in melon seedlings. Glucose, fructose and sucrose increased in leaves of inoculated and uninoculated melon plants following acetochlor treatment. The increase in sugar levels in stems and roots was less pronounced. Light intensity affected sugar content and disease incidence. The percentage of diseased plants was significantly higher in untreated plants grown under 165E m–2 sec–1 compared to plants grown under 300E m–2 sec–1. Lowering light intensity resulted in reduction of levels of total sugars on the third and sixth day after inoculation. Acetochlor had little or no effect on growth rate or sporulation of the pathogen in culture. The colonization rate of diseased plant stems by the pathogen was similar in herbicide-treated and untreated plants, thus excluding the possibility that disease reduction by the herbicide is related to direct fungitoxicity.Contribution from the Agricultural Research Organization. No. 1560-E, 1995 series. |
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| Keywords: | acetochlor herbicides induced resistance sugars |
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