Symptoms of curl leaf disease, also known as roll leaf disease, short bones. At the beginning of onset, the top leaves were slightly curled, and the curls became heavier. The back of the leaves thickened, the leaves were dark green, the leaf margins were dark, the veins were dark green, the leaves were hard and brittle, and the veins were ear-shaped. Seriously ill petiole, main vein, stem distortion distortion. The early onset of tobacco plants, often dwarfing severe foliage. Transmission routes and conditions TLCV hosts a wide range, mainly tobacco, tomatoes, mandala, honeysuckle and so on. The virus spreads through the whitefly, and the juice rubs and the dodder cannot pass through the virus. However, grafting can spread the virus, leaving infected branches in the field, and self-producing tobacco, tomatoes and other poisonous plants. After being sucked by the whitefly, they migrate to the field and pass on the virus. The whitefly poisoning method is non-persistent. 24 - 48 hours of smoking can be toxic, with poisonous whitefly on the tobacco plant to take 2-10 minutes to complete the process of taking the drug, the time after the drug was obviously related to temperature and temperature. Control methods (1) Selection of varieties resistant to pests and cultivars Tobacco plants with many hairy hairs are not conducive to feeding on whiteflies. (2) Choose disease-free strong seedlings and remove diseased seedlings. Eradicate the poisonous plants around the tobacco fields. After tobacco leaves are harvested, smoke rights and self-generated tobacco smoke are promptly removed. Reasonable layout, not mixed with solanaceous plants. (3) Control pests and disease prevention and control on the tobacco seedbed against whitefly, use 40% dimethoate EC 1000 times or 2.5% EC killed 4000 times EC. In particular, a thorough prevention and control should be carried out before transplanting to prevent the introduction of seedlings into Honda. Green Sencha,Sencha Powder,Sencha Tea Leaves,Private Label Sencha SHAOXING ROYAL TEA VILLAGE CO.,LTD , https://www.yccmatcha.com
The pathogen Tobacco Leaf curl virus is called tobacco leaf curl virus, abbreviated as TLCV, and is a virus. The virion is a double-linked virus that appears as a pair of two globular virions. Single granular diameter 15-18nm.
About 30 degrees Celsius is the fastest. The occurrence and prevalence of tobacco leaf curl disease is closely related to the activities of whitefly, high temperature and drought, whitefly activity, and heavy leaf curl disease. In the rainy season, the incidence is light. The plots left with tobacco stalks after harvest are heavy in the next year.