Brown spot disease of primrose and its control
Brown spot of primrose
Symptoms: most of them occur in the spring of the four seasons. It is caused by Alternaria of the subphylum Alternaria. There are brown spots on the leaves of infected plants. The route of transmission is that conidia are transmitted by wind and rain.
Prevention and treatment: spray 70% chlorothalonil wettable powder 1000 times liquid and other fungicides at the initial stage of the disease.
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Prevention and control of primrose mosaic disease
The symptoms occurred in the whole plant. The leaves are small, deformed, with dark green markings and yellowing. The diseased plant does not blossom, even if it blossoms, there are markings on the flowers, and the flowers are short and deformed. The pathogen is cucumber mosaic virus CMV. There are more than 190 species of dicotyledonous and monocotyledonous herbs and woody plants belonging to 45 families, such as Cucurbitaceae, Solanaceae, Compositae, Cruciferae, Rosaceae, Liliaceae and so on. There are more than 80 kinds of aphids in the route of transmission, but the main transmission vectors are peach aphid and cotton aphid. The source of infection is mainly surrounding weeds. Prevention and cure
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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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