Botrytis cinerea of Primula
Botrytis cinerea is a common disease of primroses, which occurs more commonly.
[pathogen] BotrytiscinereaPersetFr.
[symptoms] Water-stained spots appeared on the leaf tip or leaf edge, and then gradually expanded to black and rotted; the stem showed irregular brown disease spot after damage, which was easy to soft rot; the flower 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 spread by wind and rain and invade from natural orifices or wounds.
[epidemic characteristics] Cold, rainy and wet weather is usually easy to induce the epidemic of Botrytis cinerea. Excessive nitrogen or lack of potassium and calcium are also easy to aggravate the occurrence of gray mold.
[prevention and control measures] A. Planting density should be suitable to facilitate ventilation, light and humidity, watering to avoid sprinkler irrigation, control the amount of nitrogen fertilizer, increase the application of calcium and potassium fertilizer, and improve plant resistance. b. To remove diseased leaves and diseased plants in time, 70% pentachloronitrophenyl powder 8-9 g / m2 can be mixed with fine soil and covered with basin soil or disinfected soil surface for disinfection. c. At the initial stage of the disease, 65% Dysen zinc wettable powder can be sprayed 500-1000 times or 50% Sukeling 1000-1500 times for prevention and treatment.
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Anthracnose of primrose
[Pathogen] Colletotrichum primulae, a genus of fungi, belongs to the subphylum Semi-fungi, and belongs to the genus Sphaerotheca. [Symptoms] Round or nearly round brown spots appear on the leaves, and sparse small black spots are formed in the late stage, which is the conidium disk of the pathogen. [Pathogenesis rule] Disease nuclear radiation overwinters on infected leaves, conidia spread by wind and rain, and invade from wounds. [Epidemic characteristics] Higher humidity is conducive to the occurrence of diseases or to the aggravation of diseases. [Prevention and control measures
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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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