Co-Authors:
Palti, J., Dept. of Plant Protection, Extension Service, Ministry of Agriculture, Tel Aviv, Israel
Rotem, J., Div. of Plant Pathology, The Volcani Center, ARO, Bet Dagan, Israel
Abstract:
Agricultural practices such as irrigation and year-round cultivation of crops, render semi-arid areas much more suitable for development of downy mildews and late blight than might be supposed by weather criteria alone. These diseases can develop even under not very favorable humidity conditions, owing to a favorable microclimate and to abundant pathogen reproduction. However, the complex interrelations and shifting significance to be attributed to factors affecting disease development, make their regional forecasting in semi-arid areas impracticable. This is due to the absence of a clear-cut "zero-time" for the beginning of the disease development, the limited significance of the temperature factor, the unpredictable occurrence of hot and dry spells, the characteristics of short, intense subtropical rainfall, and the dominance of microclimatic factors. On the other hand, timing of control operations can be aided by regional determination of disease-free periods in crops sown in different seasons and by prediction of the length of such periods in individual fields according to their age and density, irrigation regime, and proximity to sources of inoculum. © 1973 Springer Science + Business Media B.V.
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