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Y. Mahrer

Gray mold disease caused by Botrytis cinerea Pers. is a constant threat to winter-grown cucumber. Cucumber plants were grown in 24 commerical greenhouses covered with either ultraviolet absorbing (UVA) polyethylene or with one of five different brands of infrared absorbing (IRA) polyethylene sheets. During the relatively dry winter of 1985-1986, disease development in the plant canopy was limited due to nonpersistence of dew. Disease severity under the different IRA sheets was closely correlated with number of dew hours (r = 0.965). During the rainy winter season of 1986-1987, dew persistence was greater and the gray mold epidemic was correlated with cumulative degree hours around the optimum for disease development, i.e., 15-25 degrees C. It can be concluded that epidemics are influenced by air temperature, relative humidity, and dew duration on the canopy. On the one hand the IRA plastics reduce dew duration on plants, but on the other hand they extend the period of time of temperatures around the optimum for occurence of epidemics.

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הספר "אוצר וולקני"
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תנאי שימוש
Effects of climatic conditions in polyethylene-covered structures on gray mold disease of winter cucumbers
3

Y. Mahrer

Gray mold disease caused by Botrytis cinerea Pers. is a constant threat to winter-grown cucumber. Cucumber plants were grown in 24 commerical greenhouses covered with either ultraviolet absorbing (UVA) polyethylene or with one of five different brands of infrared absorbing (IRA) polyethylene sheets. During the relatively dry winter of 1985-1986, disease development in the plant canopy was limited due to nonpersistence of dew. Disease severity under the different IRA sheets was closely correlated with number of dew hours (r = 0.965). During the rainy winter season of 1986-1987, dew persistence was greater and the gray mold epidemic was correlated with cumulative degree hours around the optimum for disease development, i.e., 15-25 degrees C. It can be concluded that epidemics are influenced by air temperature, relative humidity, and dew duration on the canopy. On the one hand the IRA plastics reduce dew duration on plants, but on the other hand they extend the period of time of temperatures around the optimum for occurence of epidemics.

Scientific Publication
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