A Detailed Guide to the Latest Control Methods for Ginger Leaf Blight
Ginger leaf blight is a disease caused by fungi, occurring sporadically across the country, with a limited spread; except in a few areas, it is generally mild, but in the Yangtze River basin it causes severe damage from July to August. High temperature and high humidity easily trigger the disease, and it is severe in continuous cropping land, overly dense plant growth, poor ventilation, excessive nitrogen fertilizer, and excessive vegetative growth. Now let us take a look at the control methods for ginger leaf blight!
Damage Characteristics
In the early stage of ginger leaf blight, the leaves appear dark green, gradually become thicker and glossy, and yellow spots appear between the veins and gradually expand, causing the whole leaf to turn yellow and wither. The surface of the lesions shows small black granular dots. It mainly damages the leaves. Yellow-brown necrotic spots begin to appear on the diseased leaves and gradually spread to the entire leaf surface, with small black granular dots on the surface of the lesions.
Occurrence Pattern
The pathogen of ginger leaf blight is Mycosphaerella zingiberis, and the fungus overwinters on diseased plant residues. In spring, it produces ascospores, which spread through wind and rain, insects, or agricultural operations. High temperature and high humidity easily trigger the disease, and it is severe in continuous cropping land, overly dense plant growth, poor ventilation, excessive nitrogen fertilizer, and excessive vegetative growth.
Control Methods
1. Pay attention to a reasonable fertilizer ratio. Along with nitrogen fertilizer, apply phosphorus and potassium fertilizers as well, especially potassium fertilizer.
2. For chemical control, use 70% thiophanate-methyl at 1000 times dilution, or 75% chlorothalonil at 1000 times dilution, and spray the whole plant foliage at the early stage of the disease, once every 7 to 10 days, for 3 consecutive sprays.
3. In production, avoid continuous cropping and, where feasible, implement crop rotation of more than 2 to 3 years.
4. It is best not to plant ginger in low-lying land. Ginger fields should be chosen on higher terrain with convenient drainage and irrigation.