Effect of foliar spray with some fertilizers and chemicals on vegetative growth , yield and its relation to powdery mildew disease of squash plants [electronic resource].

Includes reference.

In order to save the Egyption ecosystem from pollution with pesticides. under laboratory conditions . application of potassin (P) , mixd (N+ P + K) , potassium sulphate and potassin (N) at 800 ppm in vitro decreased conidia germination and length of germ tube. However the least effective treatment was Urea (N) .Under field condition • all tested macroelements as foliar spray reduced powdery mildew disease severity . Application of (N + P + K). potassin- F • potassium sulphate and calcium supper phosphate resulted the best effects. Disease severity was reduced to 18.14 . 18.95 • 19.78 and 20.96% respectively compared with control 63.65% . Observed results clear The Topase and sulpher micronized fungicide gave the best disease control .Two field experiments were carried out on squash cv . Eskandrani in the two summer season 2003 and 2004 to study the effect of foliar application with Urea 1% • calcium super phosphate 1% • potassium sulphate 1% + potassium sulphate 1% • potassin-N 2.5 mill • potassin-F 2.5 emil • Topas 0.25 mill and sulpher 2.5 gmll on growth , sex expression • yield • chemical composition and disease severity of powdery mildew of squash plants . The results revealed that • vegetative growth (number of leaves. plant height. fresh and dry weight) were significantly increased by foliar application with all treatments compared with control .Spraying squash plants with Topase gave the highest values of number of fruits per plant • morever • foliar spray with salpher micronized gave the highest values of fresh and dry weight plants. Average fruit weight. early yield and total were obtained by foliar application squash plants with Urea 1% + calcium super phosphate 1% + potassium sulphate 1% and potassin•N 2.5mlll . The chemical composition of the leaves revealed that different treatments used significantly increased N . P and K compared with control. In general • it can be stated that foliar application with Urea 1% + calcium super phosphate 1% + potassium sulphate 1% and potassin-N 2.5 mill were recommended to raise squash production under the environment condition of this investigation.

Summary in Arabic.

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