Effect of watering and microelement treatment on the phytophthora disease of tomato
1994
Deli, J. (Debreceni Agrartud. Egyet. (Hungary). Novenyved. Tansz.)
Data of research on connections of water content and nutrient supply indicate that the nutritional level of host plant is determinative both on the quantity and quality of yield but also on the tolerance or resistance against diseases. The author studied in the period 1982-1987 the changes in the nutrient content of healthy and diseased tomato plants in relation to watering. The influence of microelements (Mn, Cu, Zn) was also studied on the phytophthora disease (pathogen: Phytophthora infestans (Mont.) de Bary) of tomato. It was established that while the N, P and K level was always higher in healthy leaves, the amount of Na Ca increased in infested leaves. From among the microelements the level of Mn, Zn and Fe increased, Cu content, however, decreased as a result of watering. From the microelement treatments only the copper sulphate decreased consistenty the severity of disease, independently of the way of treatment, i.e. whether it attained the foliage of plants or their earth. Combined dosage of the three microelements resulted in a positive effect both in watered and unwatered treatments. In wathered treatments the amount of phytophthora-diseased fruits was less by 8-34 o/o than in non-watered ones, with the exception of ZnSO4
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