Control of Brown spot of Primula
Symptoms are easy to occur in the four seasons. The leaves are brown spotted.
The pathogen Alternariasp. It is a semi-known Alternaria.
The conidia are transmitted by wind and rain.
Prevention and treatment methods spraying 70% chlorothalonil wettable powder 1000 times liquid and other fungicides at the initial stage of the disease.
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Control of Brown spot of Primula
Symptoms are easy to occur in the four seasons. The leaves are brown spotted. The pathogen Alternariasp. It is a semi-known Alternaria. The conidia are transmitted by wind and rain. Prevention and treatment methods spraying 70% chlorothalonil wettable powder 1000 times liquid and other fungicides at the initial stage of the disease.
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Control of bacterial Leaf spot of Primula
Symptoms in the spring in the four seasons, leaves and receptacle disease. At the initial stage, water-immersed irregular lesions were produced along the veins, then yellowed, then browned, enlarged, and the symptoms of marginal blight occurred. In severe cases, it withered from the lower lobe. On the multi-flower primrose spring, dark water-immersed spots first appeared on the leaves, and then the disease spots became light brown, with obvious yellow halos around them. Pathogen Pseudomonassyringaepv.Primrlae (ArketGardner) Young,DyeetWink
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