استنباط مفتاح حقلي لقياس مرض شرى أوراق الرز الذي يسببه الفطر Magnaporthe grisea (Hebert)‎ Barr

الملخص EN

This study was conducted to develop a new field key to evaluate the severity of rice blast disease caused by Magnaporthe grisea (Hebert) Barr.

This key included the determination of the average area of elliptic lesions for all lengths of these lesions which appeared on the rice leaves, and the calculation of the proportion of lesion area to the total leaf area.

The utilization of this key depends on available record of the number and length of lesions on the upper two leaves.

The results showed that the utilization of this key provides a precision and speed in assessing severity of infection directly in the field.