Oat leaf disease
Symptoms Oat red leaf disease is an important disease in the oat growing area in China. After the plants become infected, the upper leaves generally show symptoms. After the leaves are damaged, they begin with the tips of the leaves or the margins of the leaves, appear purple or red, gradually expand downward into red and green stripes or mottled, and the diseased leaves become thicker and harder. The later leaves were orange-red and the leaf sheaths were purple, and the diseased plants had different degrees of dwarfing. The diseased plants showed very obvious. In recent years, the disease has become intermittently epidemic. Some years have caused great losses.
Barley yellow dwarf virus pathogen, referred to as BYDV, called barley yellow dwarf virus, is a virus. Viral particles are equiaxed positive icosahedrons. The ultrathin section of the phloem tissue of the diseased leaf was observed under electron microscope. The diameter of the virion was 24 nm, and the lethal temperature of the virus in the juice was 65-70°C. Can infect oats, wheat, barley, rye, corn and so on.
Transmission routes and disease conditions Viruses can only be transmitted through wheat stubble. The parasites are Schizaphis graminum, Rhopalosiphum padi, Sitobion avenae, Metopolophium dirhodum, Rhopalosiphum maidis. )Wait. These locusts are transmitted in a persistent manner. The transmission rate of aphids was high within 10 days after the aphid was obtained, and then decreased after 10 days. Only a few individuals could transmit the virus after 20 days. After the virus is transmitted from the locust to the oat plant, the disease develops after a period of incubation.
Control methods (1) selection of disease-resistant varieties. (2) Improve cultivation conditions and strengthen management. (3) Before sowing, the seed is soaked with 75% phorate or 40% methylisotriphos-phosphate, and the application amount is 1kg. The water lookg is sprayed with 1000kg of oat seeds and dried, and sown. It is a simple and effective prevention. Measure.
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