Tea disease

Symptoms are also called star diseases. Anhui, Fujian, Zhejiang, Jiangxi, Hunan, Sichuan, Yunnan, and Guizhou provinces all have tea regions. The main damage is young leaves, tender shoots, tender stems and petioles, and mainly young leaves. The young leaves infected with the diseased tip size brown dots, and then gradually expanded into a grayish-white circular spot with a diameter of l-2mm, with a depression in the middle and a dark brown to purple-brown ridge line at the edges. When the humidity is high, the diseased part has scattered black dots, and the number of lesions on the diseased leaves ranges from several tens to several hundreds. Some merge into irregular large spots and the leaves deform or curl. Leaf veins are distorted or deformed. The diseased stems were dark brown in color, and turned gray afterwards. The diseased part also had black small grains. The length of the diseased section was shortened, the weight of the buds was reduced, and the number of clips increased. Severe spread to full shoots, forming shoots.

The pathogen Phyllosticta theaefolia Hara said that the tea leaf spot mold is a fungus of the subphylum Fungi. Conidia are spherical to oblate spheroids, 32-8032-80(um) in size, dark brown, with a papillary orifice at the top, burying at the beginning, and then breaking through the epidermis. Conidia elliptic to ovate, unit cells colorless, size 3-52-3 (um). After the bacteria were cultured on PDA medium for 48 hours, white mycelium grew and then turned black, giving rise to many small black spots, that is, pathogenic fruiting bodies. The temperature limit of mycelial growth is 2-25°C, and the suitable temperature is 18-25°C. Above 28°C, the growth stops. Light is conducive to the growth and reproduction of germs.

Transmission routes and pathogenic conditions The pathogens are overwintering in diseased leaves or diseased stems with mycelia or conidia. During the early development period of the late spring tea plants, a large number of conidiospores were released from the conidia, which spread through the rain and rain and invaded the young stems and leaves when the humidity was suitable. After a 1-3 days of incubation, new lesions began to form on the lesions. Conidia are produced again, and repeated infections are repeated for many times to spread the disease. The disease is a low temperature and high humidity type disease, the temperature of 16-24 °C, relative humidity higher than 80% susceptible to disease. A temperature higher than 25°C is unfavorable to its onset. Each year mainly occurs in spring and autumn, and May is the peak period of onset. Alpine tea gardens or tea gardens lacking fertilizers, partial application of nitrogen fertilizers are prone to disease, excessive picking, and severe disease incidence of tea trees.

Prevention methods (1) Tea picking in batches and tea picking in time can reduce the infection and reduce the incidence of the disease. (2) Promote the use of compost made from fermented bacteria, increase compound fertilizer, increase tree vigor, and increase resistance to disease. (3) spraying 75% chlorothalonil WP 750 times or 36% thiophanate-methyl suspending agent 600 times, 50% benomyl WP 1500 at the beginning of spring tea from the end of March to early April Times of liquid, 70% mancozeb WP 500 times, 25% carbendazim WP 500 times.

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