The scallion rust is mainly caused by harmful leaves and flower buds. At the early stage of the disease, an orange-yellow blister with an elliptical or spindle-shaped bulge is formed on the epidermis, and the posterior epidermis ruptures outward, emitting an orange-yellow powder, namely the pathogen urediospores and urediospores. After the fall, the erythema becomes dark brown, and when it ruptures, it emits dark brown powder, that is, teliospores and winter mites. In severe cases, the lesions are connected into pieces, such as iron rust, causing the leaves to be full of erythema, and the diseased leaves are dry. This resulted in reduced production and reduced quality.
Control methods: First, after harvesting, remove the residual disease left in the field and eliminate the overwintering bacteria. The second is to apply more organic fertilizer, increase the application of phosphorus and potassium fertilizer, and improve the disease resistance of plants. Third, spray at the beginning of the disease, you can use 15% of the powder rust WP 2,000 times to 2500 times or 50% rust emulsified oil 800 times a 1000 times solution, or 65% sensitized zinc WP 500 times, or 70 % mancozeb WP 400--500 times solution, or 25% enemy de-emulsion 3000 times solution, or 70% mancozeb WP 1000 times solution plus 15% powder rusting WP 2,000 times Liquid, or 25% of the enemy de-emulsion 4000 times liquid plus 15% powder rusting wettable powder 2000 times liquid, etc., every 10 days or so, a total of 1-3 times. Various medicines are used in rotation.
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