Management practices affecting powdery mildew disease of grapes in Egypt [electronic resource].

Includes references.

Powdery mildew of grapes caused by Uncinula necator (Schw.) Burr. Is very important disease which severely affect leaves, branches and cause fruit splitting. In Egypt; this disease showed low percentage and severity of infection in the northern governorates i.e., (Alexandria and Behaira) while it was more severe in the southern ones (Qualubia and Giza). Severity of infection was higher at July and August than recorded earlier. Application of the biocontrol agents to grape plants led to significant reduction of disease symptoms and increasing of yield production. As for disease reduction Plant guard showed the best results while Trichoderma harzlanum application gave the best yield of Thompson grape cultivar .Individual application of Camphore, Cumman and/ or Mentha oils significantly reduced disease incidence and improved yield quantity and quality. Mentha and Cumman oils; respectively; gave the best results on Thompson grape cultivar. Similar results were obtained when extracts of the same plant leaves were applied. Bellis and powder sulfur were the best tested fungicides in disease reduction and yield production.

Summary in Arabic.

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