How to prevent and cure primrose spot disease?
Prevention and control of primrose spot disease:
First, breeding disease-resistant varieties.
Second, strengthen the management of fertilizer and water, increase the application of organic fertilizer and phosphorus and potassium fertilizer, and avoid excessive application of nitrogen fertilizer.
Third, after the onset of the seedling disease, start spraying 70% methyl thiophanate wettable powder 1000 times and 75% chlorothalonil wettable powder 1000 times, or 50% mixed thiophanate suspension or 36% thiophanate suspension 500 to 600 times, or 1: 1: 100 Bordeaux.
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Botrytis cinerea of Primula
Botrytis cinerea is a common disease of primroses, which occurs more commonly. [pathogen] BotrytiscinereaPersetFr. [symptoms] watery spots appeared on the leaf tip or leaf edge, and then gradually expanded to black and rotted; the stem showed irregular brown spots, which were prone to soft rot; the flowers became brown and rotted and fell off after damage. In the later stage of the disease, a grayish-brown mildew layer was formed in the disease. [incidence regularity] the pathogen overwintered in the remains of diseased plants or in soil. Conidia are transmitted by wind and rain
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Prevention and treatment of Primula spot
The symptoms occur on the leaves. The spot is usually 3-4 mm in diameter, brown, and in severe cases, the diseased leaves die, resulting in fallen leaves. The disease spread from the lower lobe to the upper lobe. The pathogen RamulariaprimulaeThumen is Alternaria alternata. It belongs to a subphylum of semisciferous fungi. Conidiophores protruding from stomata, several branches clustered, extremely short, unbranched, colorless, slightly curved at the end; conidia cylindrical or short rod-shaped, unicellular or bicellular, colorless, 16-24 × 3-4 microns in size. The route of transmission and the conditions of the disease
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