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.
The pathogen Pseudomonassyringaepv.Primrlae (ArketGardner) Young,DyeetWinkie is called the pathogenic type of Pseudomonas clove. In general, spring in four seasons, multi-flower, alpine and P.maracoides are more susceptible, while those in Qiuyuan and denticulate are more resistant.
Prevention and cure method
1. Strengthen cultivation management, cultivate disease-free seedlings, raise seedlings with new disease-free soil seedling bed, timely release air in protected land, reduce greenhouse and room humidity, control irrigation after incidence, promote root development and enhance disease resistance, and implement high ridge plastic film mulching cultivation in open field. level the land, improve drainage and irrigation facilities, remove the remains of diseased plants and turn the soil after the end of the viewing period. These measures play a certain role in reducing the incidence and harm.
2, chemical control 50% succinic fertilizer copper (DT) wettable powder 500x liquid, has a special effect on bacterial leaf spot, generally can not be mixed with other agents. 60% ethyl phosphine aluminum (DTM) wettable powder 500x liquid, or 77% can kill 400x wettable granule liquid.
Streptomycin sulfate or 72% agricultural streptomycin wettable powder 4000 times solution or neoptomycin 200-250ppm can also be used.
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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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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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