Sunflowers are grown in many places in China. Sunflower seeds have extremely high oil content, delicious flavor, can be fried, and can be oiled. It is an important oil crop. What diseases should be controlled to grow sunflowers?
Two major diseases, sunflower rust and sunflower brown spot, often occur during the planting of sunflowers. Linyi Fertilizer Network Copyright
First, sunflower to disease symptoms identification Linyi Fertilizer Network Copyright
1. Sunflower rust is an important disease of sunflower. In the pandemic year, the yield is reduced by 40% to 80%. The rust-like spores can be formed after the leaves, petioles, stems, sunflowers and other parts are infected. The leaf is infected, and the brown blisters appear on the back of the leaf. It is the pathogen of the summer spore heap. After the surface is broken, the brown powder is released, that is, the summer spores of the pathogen, and the diseased part produces many dark brown blisters, that is, the teliospores of the pathogen, which are scattered. The black powder, the teliospores, is severely causing early dryness of the leaves. Linyi Fertilizer Network Copyright
2, sunflower brown spot disease is also known as spot blotch. It can occur in both seedling and adult stages. Cotyledons and seedlings were infected with nearly round brown lesions on the leaves, and a yellow halo appeared on the periphery, and the back of the lesions was grayish white. When the adult plants are infected, the lesions are polygonal, brown, and also have a yellow halo. On the later lesions, small black spots are formed, that is, the pathogens are conidia. It is rainy and damp, the lesions are easy to fall off or perforate, and the diseased spots are fused, and the whole leaves die. When the stem and petiole are infected, the lesion is brown and long strips. It is an important disease widely distributed in the world. Linyi Fertilizer Network Copyright
Second, sunflower disease prevention and control recommendations Linyi Fertilizer Network Copyright
1. Sunflower rust This year, due to the high precipitation in Erdaobaihe Town, the climatic conditions are conducive to the prevalence of sunflower rust. In addition, the sunflower planting area has expanded in recent years, and the variety resistance is poor, forming favorable ecological conditions for the disease. Recently, it is recommended that the main planting areas of each village take corresponding control measures for different disease situations. In the early stage of the disease, spray with 80% Daisen zinc 600-800 times solution, use 75-100 liters of water; or spray with 25% powder rusting wettable powder 1000-1500 times, and use 35-40 grams of medicine. Linyi Fertilizer Network Copyright
2, sunflower brown spot disease in the autumn harvest in time to clean the pastoral, remove the diseased leaves, concentrated burning or manure; advocate the application of Japanese enzyme bacteria prepared compost or decomposed organic fertilizer; in the early stage of disease removal of diseased leaves, if necessary, 50% more bacteria Ling Wet Powder 1000 times solution or 50% methyl thiophanate 1500 times spray. Linyi Fertilizer Network Copyright
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