Maize wilting disease

Symptoms also known as corn bacterial leaf blight, Shigella spp., Shigella spp., Escherichia coli wilt disease, etc., belong to the whole system of vascular bundle disease, is an important foreign inspection in China. The initial symptoms of the disease are wilting. The leaves are gray-green to yellow, with irregularly shaped or wavy edges, parallel to the veins, and can be severely extended to the entire leaf. These streaks quickly turn yellow and brown and dry, turning hollow in the medullary part of the stem near the ground. Bacteria expand through vascular bundles, sometimes flowing from the vascular incision to yellow bacterial pus. Some can also enter the grain. The affected strain became short or male flowers died prematurely. The disease is distributed in the United States and Canada, Mexico, Brazil, Peru, Guyana, Italy, Poland, Romania, Yugoslavia, Thailand, Vietnam, Malaysia and so on.

The pathogen Xanthomonas stewartii (Smith) Dowson is synonymous with Erwomoa stewartii (Smith) Dye. Erwinia scutellariae (Erwinia zeae wilt disease) is a bacterium. Bacteria rod-shaped, no flagella, Gram negative staining size 0.9-2.2o. 4 to 0.8 (um).

Transmission routes and conditions The seeds can be carried. The bacteria can also live in winter in the body of Chaetocnema pulicaria. Contaminated fleas can also spread the disease. According to the United States study, corn beetle has an important role in the overwintering and spreading of bacteria.

Elements affect the sensitivity of corn to the infection. The application of too much ammonium nitrogen and phosphate fertilizers can increase the susceptibility, and high temperatures are conducive to the epidemic. Sweet corn is not resistant to disease, and dent corn is lighter.

Control methods (1) Selection of breeding resistant varieties. (2) Early spraying of pesticides to control corn hop.

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