During this year's corn trumpet season, some farmers often reflected that the corn stalks they had planted were inexplicably softened and issued unpleasant odors, and the corn stalks in serious conditions rotted. The plant protection personnel of the city conducted a survey on the corn fields reported by the farmers and identified them as bacterial stalk rot. The disease mainly occurred in some plots of townships such as Mingshui, Longshan, Puji, and Fuzhen in the city. Spotting occurs, the average field block rate of 10-20%, 80% of serious plots. Remind the majority of farmers in the future low-lying or poor drainage, excessive density, poor ventilation, excessive use of nitrogen fertilizer fields to carry out timely inspections and prevention.
Symptoms:
The main damage is the middle stem and sheath. When more than 10 pieces of corn are in the leaves, water-stained rot begins to appear on the leaf sheaths, and the diseased tissues begin to soften and emit odors. Lesions on the leaf sheaths are irregularly shaped, with reddish-brown edges, and water-stained areas at the junction of diseased and healthy tissues are particularly evident. When the humidity is high, the lesion quickly expands up and down. When the disease is severe, the plants often fall above the diseased part 3 to 4 days after the onset of the disease and overflow the yellow-brown rotten bacillus liquid. In the dry condition, the expansion is slow, but the diseased part is also easily broken, resulting in inability to head or seed.
Control methods:
1. Agricultural control
Implement rotations and avoid continuous production as much as possible. After the harvest, we should clean the garden in time and properly treat the diseased plants to reduce the source of bacteria. Strengthen field management, use sorghum cultivation, no flood irrigation, timely drainage after rain, prevent moisture retention, promote robust corn growth and enhance disease resistance.
2. Chemical control
(1) Spraying: spray 25% Ye Ku Ling or 20% Ye Huojing wettable powder in corn trumpet season, add 60% thiazole copper or thiazole copper or 58% metalaxyl WP wettable powder 600 times liquid There is a preventive effect. Immediately after the onset of the disease, spraying 5% of the bacteriostatic water solution 600 times or the use of agricultural streptomycin sulfate 4000 times, the control effect is better.
(2) Stem coating liquid: If necessary, peel off leaf sheath at the early stage of disease, and apply lime water to the diseased area. Use 1kg of hydrated lime to effectively brush 5 to 10kg of water.
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