The lesions on the affected leaves were brown to black, smaller, polygonal or near-circular, the lesions on the back were light brown, oily and shiny, and finally they were dark gray or gray. The fruits were mostly victims of the lower part and were water-stained. Harmful walnut leaves, twigs, flowers and fruit, resulting in dead branches and shoots, inflorescence and fruit black rot early, seriously affecting walnut growth and yield.
Control methods:
1. Strengthen water and fertilizer management, increase tree vigor, and increase resistance;
2, Qingyuan, before the walnut sprouts, after the exhibition leaves and fruit set (mis-flowering) were sprayed 5,0.5,0.3 Baume degrees of lime sulfur;
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