Yellow-skin shoot rot, also known as yellow dead skin disease. In Guangzhou, Nanhai, Dongguan, Sanshui, Huizhou, Shantou and other places. Those who suffer from mild disease reduction will suffer no gains and even the entire park will be destroyed. The serious disease rate will reach 70-90%. First, the symptoms The young shoots of shoot shoots were damaged by brown necrosis and rot. The tip of the top of the shoot was black-brown to black, and the diseased part shrank like a cigarette. When wet, there is a large amount of white mold and orange-red viscous spores on the surface. Leaf blade rot victims often start to brown and rot from the tips of the leaves and leaves, then extend to most or all of the leaves, and often have dark brown undulations at the diseased and healthy borders. Fruit rot victims suffer from round, brown, water-stained lesions, and a large amount of white mold appears on the surface when wet. The fruit rots. The branches splintered on the damaged branches to form a spindle-shaped, brown, uplifted and centrally depressed lesion, about 3 to 12 mm in length, and the surface is corked. Second, the pathogen The pathogen of yellow-skin shoot rot is Fusarium lateritium Nees ex LK. Var. Longum Wollenw., which belongs to the subphylum Subgenus. The aerial mycelium was sparse. After being colorless, it was brick red. The center of the colony was orange-orange spores. The conidia had five septa (Figure 2). The young shoots and young fruit of citrus were susceptible after artificial inoculation. Third, the infection cycle, disease conditions The yellow-skin shoot rot pathogens overwinter on the diseased part with mycelia and conidia. A large number of conidia grow in the spring of the second year, and it is harmed by rain and rain spreading to the young shoots of the yellow skin. Contaminated spores were re-infested on the new diseased part, causing fruit rot and branches to rot. With infected seedlings, the disease can spread to new areas. Diseases can occur all the year round, with peak incidence from April to August, but incidence of spring shoots is more important than autumn shoots. Fresh shoots, tender shoots are susceptible to disease, and mature shoots and shoots are more resistant to disease. Fourth, control methods Prevention of yellow tip rot mainly focuses on two steps: (1) In the winter, catch the clean garden. Combine the pruning and cut off the diseased shoots, diseased leaves, and diseased branches. Spray 1 to 2 times 50% carbendazim WP 500 times. (2) Strengthen the inspection of new shoots and sprouts in the yellow rind. Find the symptoms of the above diseases and spray the medicine in time. 50% of carbendazim WP can be used for 500 to 600 times; 70% Thiophanate can be wetted. Powder 800 ~ 1000 times; 40% copper oxychloride glue suspension 500 times and so on.
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