Rose Botrytis cinerea is distributed in Guangzhou, Hangzhou, Shanghai, Zhengzhou, Tianjin, Shenyang and Jiangsu in China. The main damage to the flower of the plant.
Coriander: The disease affects the roses and twigs of the Chinese rose, and sometimes damages the leaves. When the buds are infested, irregular spots on the water spots are formed on the buds, the lesions can be expanded to the entire buds, the lesions turn grayish black, and finally the whole buds become soft and rot. The diseased bud hangs on or near the diseased tissue after wilting. When the flowers are infested, some of the petals turn brown and crumpled. When the leaves are damaged, irregular spots appear at the edge of the leaves and the tip of the leaf, which become slightly water-stained, slightly sink, and then turn brown and corrupt. Pathogens can also invade shoots that have been removed. In warm and humid conditions, the diseased area can produce a large amount of gray mold layer.
Pathogens: The pathogen is Botrytis cinerea Pers., which belongs to the subphylum Aspergillus subfamily, Aspergillus, Toxoplasma, and Botrytis. Germs can form sclerotia. The sexual type is Sclerotinia fuckeliana (deBary) Fuck. It belongs to Ascomycete subsp.
Incidence of the disease: The pathogens in the plant disease and diseased bodies overwinter in the form of mycelium and sclerotia. Infested by conidia in the following year. Conidia spread by wind and rain. High temperature and high rainfall are conducive to the formation and spread of conidial masses. After contact with the host, the conidia germinate and invade. Overcultivation, poor ventilation, high humidity, lack of light, or partial application of nitrogen fertilizer cause plants to grow weak and diseases to occur easily.
Prevention: 1 reduce the source of infection: timely removal of the sick, disease buds, should be cut along with the stem several centimeters under the bud and destroyed. 2 When growing in a greenhouse, care should be taken to avoid excessive humidity. In autumn, it is not advisable to use defoliation roots in order to avoid over-humidity of stem stems, which will facilitate the survival of pathogens. 3 Chemical control: During the onset, spray 65% â€‹â€‹Zedexite WP 600 times, or 75% chlorothalonil wettable powder 700 times, or 70% thiophanate-methyl WP 1500 times, or 50 % Nitrosamine 1000 times or 1:1:120-160 Bordeaux mixture.
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