Anthracnose of primrose
[pathogen] Colletotrichumprimulae belongs to the subphylum of fungal semi-knowns and the genus Rhizoctonia.
[symptoms] there are round or nearly round brown spots on the leaves, and sparse small black spots are whorled on the disease spots in the later stage, which is the conidium disk of the pathogen.
[incidence regularity] the diseased nuclear radiation overwintered on the susceptible deciduous leaves, and the conidia spread by wind and rain and invaded from the wound.
[epidemic characteristics] higher humidity is beneficial to the occurrence of diseases or aggravate the disease.
[prevention and control measures] A. Remove diseased or fallen leaves in time to reduce the source of infection. b. At the initial stage of the disease, 65% Dysen zinc wettable powder 600 times or 50% carbendazim 800 times or 80% anthrax Fumei wettable powder 500-800 times for prevention and treatment.
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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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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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