دور اليوريا في برنامج مكافحة مرض جرب التفاح الناتج عن الفطر Venturia inaequalis

This study tries to determine the effect of urea on the infection of apple with scab caused by Venturia inaequalis (Cooke ) Wint. Four concentrations of urea were examined. Results showed a good effect of urea in reducing infection of scab of both leaves and fruits. The effect of 5% and 7.5 % was medium, while it was good in 10% and 12.5 %. Results also showed that infection of leaves was reduced by 35.6, 50.0, 79.4 and 83.8% for the concentrations of 5, 7.5,10,12.5% respectively, and the fruit infection was reduced by 46, 74.2, 88.0, 91.9% for 5,7.5,10,12.5% concentrations respectively. Urea plays a role in reducing the percentage of infection of leaves more clearly in Starking than Golden. Perithese has been formed in 5 % of urea and control, while we did not find Perithese in other concentrations of urea.