Cabbage rot symptoms:
The period of wilting disease wilt begins from the 6th to the 7th leaf stage. Symptoms are characterized by the discoloration of the leaf from bottom to top, dull, dehydration, wilting, and then the whole plant quickly wilts until death. The roots of the diseased plants were short and little, showing watery rot. When the disease was severe, they were easy to pull up. The stems were shortened and shortened. The cut surface was light brown rot and no odor. This symptom was different from soft rot.
In the early stages of the onset of soft rot, the outer leaves were wilting, and sooner or later and on rainy days, they returned to normal. As the disease progressed, the outer leaves collapsed and the leaves were exposed, and they turned brown and mushy and softly rotted. Immersion develops from the base of the leaf blade to the shortened stem, causing the root marrow to rot and overflowing with a sallow and odorless viscous material, until the whole plant rots.
Control methods:
One of the agricultural measures is changing crops and avoiding continuous cropping. The second is sorghum cultivation. In addition to drought and water shortages and saline-alkali land, should be used sorghum cultivation, alfalfa height 5 to 10 cm. The third is light water pouring, avoid flood irrigation, timely drainage after the rain. The fourth is to increase phosphorus and potassium fertilizers, apply formula fertilization, and increase disease resistance. The fifth is to adopt the live broadcast method to avoid the infection of wound bacteria caused by transplanting. The sixth is to remove diseased plants, remove the sick and bring them out of the field for deep burial.
Chemical control 1. Wilt disease: At the beginning of the disease, use 75% chlorothalonil WP 600 times, or 60% WP 500 times, or 72.2% Precise 600 to 800 times. Prevention, spray once every 7 to 10 days, and even spray 2 or 3 times. 2. Soft rot disease: The first is the timely control of aphids, cabbage caterpillars, diamondback moth and underground pests. The second is the initial stage of spraying with 72% of the streptomycin 3000 to 4000 times of spraying of agricultural streptomycin, spraying the diseased plants and surrounding plants as the focus, and pay attention to spraying the petiole and stem base close to the ground, the disease can be used when the enemy is serious Pine 700 times Irrigation root.
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