First, the symptoms
(a) wilt disease. The period of onset of wilt disease begins from the 6th to the 7th leaf stage. Symptomatic features are the discoloration of the leaf from bottom to top, dull, dehydration, wilting, and then the whole plant quickly wilt until death. The roots of the diseased plants were short and little, showing signs of rot in the water stains. When the disease was severe, they were easy to pull up. The stems were shortened and shortened. The cut surface was light brown and rotten. There was no foul odor. This symptom was different from soft rot.
(b) Soft rot. The onset of soft rot began at the heart-opening stage. Translucent infiltrates appeared at the base of the basal leaf. After gradually expanding, it became white. The young tissue showed water-stained decay, and the old tissue lost water and shrank. In the early stage of disease, the outer leaves are wilting, and sooner or later and the rainy days can still return to normal. As the disease progresses, the outer leaves collapse, leaving the leaf ball exposed, and then turn brown and sticky and soft rot. 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.
Second, control methods
(a) Agricultural measures. One is to change gears and avoid continuous production. 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.
(b) Chemical control:
1. Wilt disease. At the beginning of the disease, 75% of chlorothalonil WP can be used 600 times, or 60% of WP can be used 500 times, or 72.2% of Precise can be sprayed 600 to 800 times every 7 days. Spray 10 times a day, spray 2 or 3 times. For 69% of the severely diseased landfills, it can be used to irrigate roots at 900 times and 75 to 100 ml per plant.
2. Soft rot. 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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