What pesticide should be used to control withered lotus leaves?

The common diseases of lotus root mainly include: rot disease, leaf blight, leaf spot, etc. Today we will talk about what pesticide to sprinkle for lotus root leaf withering, which gives everyone the biggest headache. Let's take a look together.

1. Damage symptoms of lotus root leaf blight:

Generally speaking, lotus root leaf withering is leaf blight. This disease is caused by fungi of the genus Sphaerotheca in the family Erysiphaceae. It damages the leaves. In the early stage of the disease, pale yellow spots appear on the leaf margins and gradually spread toward the middle of the leaf. The spots change from yellow to yellowish brown, and finally spread from the mesophyll to the leaf veins. The spots become dark brown, and the whole leaf dies, resembling being burned by fire, commonly known as "catching fire," causing reduced yield.

2. Control methods for lotus root leaf blight:

(1) Remove diseased and residual tissues in time, prune diseased leaves, and eliminate the source of the disease.

(2) Properly control density, apply more organic fertilizer, and apply more phosphorus and potassium fertilizer, so that the plants grow vigorously and their disease resistance is enhanced.

(3) In the early stage of the disease, spray with 70% thiophanate-methyl at 800-1000 times dilution, or 25% carbendazim wettable powder at 500 times dilution. The agents should be used alternately to improve efficacy.

3. What pesticide to sprinkle for lotus root leaf withering:

Before planting, spray with 70% thiophanate-methyl at 1000 times dilution or 75% chlorothalonil at 800 times dilution for closed seed treatment, cover with agricultural film and seal for 24 hours, then air-dry before planting. In the early stage of the disease, mix 0.5 kg of 75% chlorothalonil and 0.5 kg of 65% zineb with 30 kg of soil, stir evenly, and sprinkle into shallow paddy fields; use 70% thiophanate-methyl at 1000 times dilution, 65% zineb at 600 times dilution, or 1:1:160-200 Bordeaux mixture for spray control, generally spraying once every 10-5 days, for 2-3 consecutive sprays.