אסיף מאגר המחקר החקלאי

Development of climate control methods for integrated management of powdery mildew of tomato caused by oidium neolycopersici

Year:

2009

Source of publication :

Authors :

Volume :

807

Co-Authors:

Elad, Y., Dept. of Plant Pathology and Weed Research, ARO, Volcani Center, Bet Dagan 50250, Israel
Jacob, D., Dept. of Plant Pathology and Weed Research, ARO, Volcani Center, Bet Dagan 50250, Israel
Rav David, D., Dept. of Plant Pathology and Weed Research, ARO, Volcani Center, Bet Dagan 50250, Israel
Burshtein, M., Dept. of Plant Pathology and Weed Research, ARO, Volcani Center, Bet Dagan 50250, Israel
Sztjenberg, A., Dept. of Plant Pathology and Microbiology, Faculty of Agricultural Food and Environmental Quality Sciences, Hebrew University of Jerusalem, Rehovot 76100, Israel
Yehezkel, H., Besor Station, Research and Development South, Israel
Ganot, L., Besor Station, Research and Development South, Israel
Shmuel, D., Besor Station, Research and Development South, Israel
Matan, E., Besor Station, Research and Development South, Israel
Messika, Y., Extension Service, Ministry of Agriculture, Israel

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Abstract:

Oidium neolycopersici causes severe powdery mildew on all aerial parts of tomato, excluding the fruit. Plants may die dew to powdery mildew. Chemical fungicides are commonly used for its management in covered structures and 6-15 sprays may be applied each season. The objective of the present work was to identify potential agro-technical methods such as climate management and integrate it with other means of control for tomato O. neolycopersici powdery mildew suppression. Under controlled conditions, in growth chamber experiments, disease did not develop at 28°C. Within the range of 70 to 99% RH, disease was less severe under the higher RH than the drier conditions. Data collected in three commercial-like greenhouse experiments involving various climate regimes were used to draw correlations regarding the effects of temperature and RH on the development of epidemics. Development of disease was negatively correlated with the temperatures in the low and high ranges and low RH. Elevated temperatures regime during day time were obtained by closing the side greenhouse walls to allow day temperatures of 27-34°C. These conditions were found very effective in reducing the disease under commercial-like greenhouse conditions in the autumn-winter season. Combination of this method with control agents such as plant extracts and sulfur is effective in O. neolycopersici powdery mildew suppression in greenhouse tomatoes.

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