Symptoms of rust
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Amaranth rust mainly infects leaves and pedicels. It is a disease caused by fungi and is mainly transmitted by airflow. In the early stage of the disease, a yellow-shaped blister with a hammer-shaped or elliptical bulge is formed on the epidermis. A yellow halo is often formed around the lesion, and then expands into a large erythema. After the epidermis ruptures, an orange-yellow powder is scattered. Both sides of the leaf can be infected, and black vesicles appear on the leaves and stems in the later stage. When the disease is serious, the lesions fill the entire leaves, and the leaves of the whole amaranth turn yellow, and a lot of rust powder is emitted, which loses the edible value.
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Prevention
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　　 1. Selecting excellent varieties adapted to different periods: such as Beijing Dabaigen, Beijing Daqing Miao, Hanzhong Donglu, Shouguang Dugenhong, Shandong 9-1 and other fine varieties, can reduce the incidence.
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　　 2 , reasonable rotation: reasonable rotation, reduce the accumulation of bacterial sources. Daejeon planting should be selected fertile, organic matter than the foot plots, water should be irrigated before planting, Shizujifei applied per acre of the full maturity of manure and other manure 3000 kg, 30 kg of 25% fertilizer and spraying disinfectant at the surface The soil was disinfected by adding 800 times liquid of New High Fat Film .
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　　 3 , reasonable close planting: to achieve good ventilation and light, timely drainage after rain, to prevent excessive humidity in the field; using formula fertilization technology, more phosphorus and potassium fertilizer, improve disease resistance, while spraying a new high-fat film 800 times liquid to form a layer of protection Membrane to prevent pathogens from invading by airflow. And in the growing stage of the leek, the strong stems can be sprayed, which can make the stems of the plants strong, the leaves are thick, the leaves are fresh, the plants are flourishing, and the natural taste is strong.
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　　 4 , as low as possible when harvesting: pay attention to clean the noodles, after the harvest, spray 45% sulfur suspending agent 400 times liquid disinfection, and spray a new high-lipid film 800 times liquid to enhance the efficacy, improve the use of active ingredients Rate and consolidate the control effect.
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　　 5, early onset timely spraying: spraying 25% Propiconazole EC 3000 times or 25% aqueous emulsion tebuconazole 3000 times, 30% difenoconazole 3000 times EC propiconazole, triadimefon may be 15%. wettable powder 2000 times, every 10 days spraying 1, control 2.
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　　 6, the incidence of heavy land, the agent can not guard, it is best to cut the roots from the ground Qi: Department of rhizome left in spraying a second fungicide, and strengthen management, increased fertilizer to accelerate the growth of leeks, chives grow back so stand up.
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(Source: Agricultural Science and Technology News Author: Lixiao Heng)
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