Identification and control of ginger plague

Ginger blight, also known as ginger rot or bacterial wilt, is the most harmful disease in ginger production, generally causing 20-30% loss, serious seed destruction, storage period continues to cause damage to rot.

This disease can harm stems and leaves, but mainly harm underground rhizomes. More in the base of the stem near the ground and the upper part of the underground stem, the disease first, the disease spot is initially wet, dirty brown dull, the internal tissue gradually becomes soft and rotten, leaving only the outer skin, hand pressure on the diseased part can squeeze out the dirty white juice with foul smell; the root is also damaged and causes yellow brown rot. After the rhizome is damaged, the stem on the ground is dark purple, the tissue gradually turns brown and decays, the leaves wither and curl, and even cause complete wilting and death. If the diseased stem or underground stem is transected, the vascular bundle can be seen to be browned in a ring, and white pus will overflow from the vascular bundle when pressed by hand. Pathogenic bacteria mainly overwintered in soil along with diseased ginger seeds and other field hosts and their residues. Ginger seeds with bacteria were the main source of initial infection, and introduction could cause disease in new areas. Pathogenic bacteria in ginger seeds or other hosts, diseased bodies and soil can invade through natural or mechanical wounds on ginger epidermis and cause disease under suitable conditions. The bacteria can be reinfected by irrigation water, rain or pest transmission. The soil temperature of 25-30 degrees Celsius is most suitable for the disease, high temperature, rainy and humid, especially after heavy rain, ginger plague may be serious epidemic. In addition, low terrain, flood irrigation, continuous cropping or adjacent cropping with Solanaceae vegetables were also more serious.

To control ginger blast, the measures of strengthening cultivation and management should be adopted, combined with the comprehensive control of chemicals.

1. Healthy ginger seeds are selected from disease-free fields or disease-free plants and eliminated again before sowing.

2. Rotation can be with rice or onion garlic rotation.

3. Ginger seed treatment: before germination, use 1:100 times of formalin solution to plant for 6 hours, fully open the seeds after the release of medicinal flavor, or use agricultural streptomycin 500 units for soaking for 24 hours.

4. Strengthen management, deep ploughing and drying soil in high ridges, apply high-quality organic base fertilizer; prevent flood irrigation and series irrigation. Discovered diseased plants immediately uproot, disease points sprinkle a small amount of lime to prevent the spread of bacteria;

5. Chemical control: must be preventive application before the onset of disease, can choose Kejunkang, copper chloride oxide, agricultural streptomycin, sterilization, etc.