1. Hazardous Diseases Hazelnuts occur frequently in the Northeast. The main damage to the leaves can also invade shoots, shoots, and fruit pods. At the onset of the onset of leaves, the yellow devil appeared first on the leaf surface and the back of the leaf. Soon after, the white devil flew out at the Yellow Devil's office. Afterwards, many devils formed a piece: the back of the disease was chlorotic, causing the leaves to turn yellow. Distorted deformation. Scorching, early leaves. If the bud is seriously damaged, the leaf cannot be developed. When the branch shoots are victimized, white powder is also produced on it, the cortex is rough and cracked, the lignification of the shoots is delayed, and the growth is weak. Susceptible to freezing damage. When the fruit is damaged, it gives birth to white powder and then turns yellow and twists. In August, small particles (closed shell) were scattered on the white powder layer, which was yellowish-brown at first, then turned dark brown.
2. Pathogens and Pathogenicity Conditions Powdery mildew is overwintering in leaves, buds, and lesions of new shoots. Spores are produced in the spring of the following year. The initial infection is caused by wind propagation to the hazelnut tree, and multiple infections can be transmitted after the generation of white powder. Infected eucalyptus trees often spread from the central diseased tree to the neighboring trees. If the disease conditions are suitable, the propagation speed is very fast. In southern Liaoning Province, the incidence is generally severe in June, and in northern Liaoning, most occur in July. In the dense plant, poor ventilation, soil viscosity, low moisture and other conditions are conducive to the occurrence of the disease.
3. Control methods (1) The diseased plant should be eliminated in time If the diseased plant is a central diseased plant, all the diseased plants should be cut down to reduce the disease. For dense clusters, appropriate thinning or thinning can be performed to improve ventilation and light transmission conditions, and to enhance the disease resistance of the tree. (2) Chemical control In the period from early May to late June, spray 50% carbendazim WP for 600-1000 times, or spray 50% thiophanate-methyl WP 800-1000 times for hazel trees. Or spray 0.2 degrees - 0.3 degrees Be lime sulfur, can achieve good control effect. When using lime sulfur, it should be noted that it should not be used in hot humid summers to avoid phytotoxicity.
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