Which diseases should be controlled when planting sunflowers?

Which diseases should be controlled when planting sunflowers? Please introduce sunflower to control the following diseases: first, symptom recognition 1. Sunflower rust is an important disease of sunflower, and the yield is reduced by 40% in pandemic years. Leaves, petioles, stems, sunflower plates and other parts of the disease can form a rust-like spore pile. Leaves infected, the initial appearance of brown vesicles on the back of the leaves is the germ summer spores heap, after the surface rupture scattered brown powder, that is, the pathogen summer spores, after the disease gave birth to many black-brown vesicles, that is, the pathogen winter spores pile, scattered black powder, that is, winter spores, the occurrence of serious early leaf drying. 2. Sunflower brown spot is also called spot blight. The disease can occur in both seedling stage and adult stage. When the cotyledons and seedlings were infected, there were nearly round brown spots on the leaves, yellow halos on the periphery, and gray-white spots on the back. When the adult plant is infected, the disease spot is polygonal, brown, and there is also a yellow halo. In the later stage, there are small black spots on the disease spot, that is, the conidium of the pathogen. Rainy and humid, the disease spot is easy to fall off or perforate, the disease spot fuses seriously, and the whole leaf dies. When the stem and petiole are infected, the spot is brown and narrow. It is an important disease widely distributed in the world. Second, prevention and control suggestions 1. Sunflower rust this year due to more precipitation in the city, climatic conditions are conducive to the prevalence of sunflower rust, coupled with the expansion of sunflower planting area in recent years, poor resistance of varieties, the formation of favorable ecological conditions for the disease. Recently, it is suggested that the main planting areas should take corresponding prevention and control measures according to different morbidity. At the initial stage of the disease, 80% Dyson zinc 600 Mel 800 times solution was sprayed, 75 Mel 100 liters of water was used, or 25% Rust Ning wettable powder 1000 Mol 1500 times solution was sprayed, 35 Mu medicine was used for 40 grams. 2. Sunflower brown spot disease cleans the countryside in time during autumn harvest, removes the diseased leaves and concentrates on burning or retting fertilizer; advocates the application of compost or mature organic fertilizer made by Japanese enzyme bacteria retting; the diseased leaves are removed at the initial stage of the disease, 50% carbendazim wettable powder 1000 times or 50% methyl thiophanate 1500 times spray can be used if necessary. Click to get more sunflower planting techniques click to get more grain and oil crop planting techniques