symptom
Important diseases of sunflower, the annual production loss by 40%-80%. Leaf, petiole, culm, kwai and other parts of the disease can be formed after the rust-like spore heap. The leaves were infected and the brown pods on the back of the leaves appeared on the back of the leaves as the uredia spores heap. After the surface ruptured, brown powder was scattered, which was the spores of the pathogenic bacteria. The posterior disease department gave birth to many dark brown pods. The black powder, ie, the teliosporus, caused severe early leaf dryness.
Control methods
(1) Breeding resistant varieties.
(2) Strengthen pre-management, timely cultivating, and rational application of phosphate fertilizer.
(3) Dressing seeds with 25% hydroxyproparginine wettable powder 100g dry mixed with 50kg seeds can reduce the incidence.
(4) Spray 15% Triadimefon WP 1000-1500 times or 50% Versalling Emulsion 800 times in the early stage of disease, once every 15 days or so, and control 1 or 2 times.
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