The whole leaf is scorched when the disease is serious. The lesions near the leaf margin and main vein were semicircular in shape. At the beginning of the leaves appear Pale yellow spots, gradually expanding into a round or nearly round spot, Brown, and visible whorls, scattered above a lot of small points of mold, to the central spot most dense. Autumn thoroughly remove the body of disease and disability.Īlso known as White Star disease, is a common tree peony disease. Peak season in spring and summer.ġ clear the disease strain in time, spray 50% CARBENDAZIM 600 times solution or 3 Be sulfur mixture before germination in early spring to kill the plant and above-ground bacteria.Ģ when peonies germinated in early spring, spreading thin film on the ground and pressing the edges with Earth pressure can prevent the spread of pathogens and accelerate the decomposition of disease residues.ģ after onset, 160-200 times equivalent Bordeaux mixture can be sprayed once every 10-15 days, or 50% carbendazim 1000 times, 65% thymosin 500-600 times, once every 7-10 days for 3-4 days.Ĥ strengthen the management of peony seedling cultivation, arrange planting density reasonably, apply nitrogen fertilizer properly, apply compound fertilizer and organic fertilizer more.ĥ reduce the source of infection: Spray 3 Be sulfur mixture or 50% CARBENDAZIM 600 times solution in early spring. In warm and rainy climate, the diseases will be caused or aggravated by the application of too much nitrogen fertilizer, the planting density is too high, which leads to poor ventilation or the retention of diseased plants. When the disease spot on the flower organ is serious, the edge of the petal will be scorched. Wet and rainy weather can be seen gray-green mold layer, stem and petiole spot long strip, Central Crack, disease department easy to break. The lesions appeared initially on the upper and lower surfaces of the leaves, Brown, Submycorrhizal, the edge of the lesions was not obvious, when severe, the leaves twisted, dry. (1) pathogen cladosporium peony: Fungal Diseases.ĭamage to the leaves, planting strip, flower, seed and other parts. Red Spot disease also known as leaf spot disease, peony disease less, mainly to harm the peony. In autumn, the dead branches and leaves were removed, and the diseased buds and leaves were removed in time to reduce the source of infection. The newly purchased tree peony seedlings were soaked for 10 ~ 15 minutes in 65% 300-fold solution of daisenxin before continuous cropping was carried out in the serious disease area. Plant clusters are large and dense, and too much nitrogen fertilizer is also susceptible to disease.įind and remove the diseased parts in time, pull out the diseased plants and destroy them in time, take care not to contaminate the healthy plants, and disinfect the tools that come into contact with the diseased plants in time.Ģ In case of disease, chemical control can be carried out: 1% equivalent bordeaux mixture, 70% thiophanate-methyl 1000-fold solution, 65% ZNZ 500-fold solution or 50% ammonium chloride 1000-fold solution are sprayed once every 10-15 days and continuously 2-3 times.ģ strengthen cultivation management, arrange planting density reasonably, remove water in time after rain, and loosen soil to hoe. Spring and the end of flowering period from June to July were the peak period of the disease. The persistent low temperature and humid climate are the main causes of the disease. The gray mould layer in the diseased part is a prominent feature of the disease.
Infected Leaves Produce Brown, purple-brown water spots, sometimes with irregular whorls, to the tip and leaf margin more. (1) the symptom seedlings appeared Brown watermarked spots at the base, and the seedlings gradually withered and fell down. The disease has a short onset and is spread by wind, causing great harm.
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