Control methods of ginger leaf blight

Ginger leaf blight is a disease caused by fungi, which occurs scattered throughout the country and is not widespread. Except for a few areas, the disease is generally mild. The disease is serious in all parts of the Yangtze River basin from July to August, and it is easy to suffer from high temperature and high humidity. Continuous cropping land, plant growth is too dense, poor ventilation, excessive nitrogen fertilizer, plant overgrowth and serious disease. Let's take a look at the prevention and control methods of ginger leaf blight.

Hazard characteristics

At the initial stage of ginger leaf blight, the leaves were dark green, gradually thickened and glossy, and the macula between the veins gradually expanded so that the whole leaf turned yellow and withered, and the surface of the spot was small black dots. The main damage to the leaves, the diseased leaves began to produce yellow-brown spots, gradually spread to the whole leaf surface, and there were small black spots on the surface of the diseased leaves.

Occurrence regularity

The pathogen of ginger leaf blight is ginger coccidiosis, which overwinters on the diseased remains, produces ascospores in spring, and spreads by wind and rain, insects or farming operations. High temperature and high humidity are easy to occur, continuous cropping land, plant growth is too dense, poor ventilation, excessive nitrogen fertilizer, plant overgrowth and serious disease.

Prevention and cure method

1. Pay attention to the reasonable proportion of fertilizers, and phosphorus and potassium fertilizer, especially potash fertilizer, should also be applied in the process of applying nitrogen fertilizer.

2. Drug control can use 1000 times of 70% methyl topiramate or 1000 times of 75% chlorothalonil. The whole plant is sprayed with foliar spray at the initial stage of the disease, and the drug is sprayed every 7 to 10 days for 3 times.

3. Continuous cropping should be avoided in production and rotation of more than 2-3 years should be carried out where feasible.

4. It is better not to plant ginger in the low-lying land, and the ginger field should choose the land with higher terrain and convenient drainage and irrigation.