“At present, we must do a good job in fertilizer and water management, and we need to drain water and drain moisture. Transplant and remove diseased seedlings.” A few days ago, in Dongxing District, Yuexing Town, agricultural technicians Wang Shuang patiently introduced the villagers to the root canker disease. Prevention methods.

It turns out that this year, rape in the Dongpo District is particularly serious. Dongpo District's agricultural department recently conducted investigations on six main varieties of Shangyi and Taihe townships. The incidence of 43 plots surveyed was 100%. The strain rate is as high as 40%. The average diseased plant rate reached 26%, posing a greater threat to the production of more than 200,000 acres of canola in the region. In addition to the harm to rape, clubroot disease also affected the production of more than 100,000 acres of cruciferous vegetables in the region.

According to Wang Shuang, the clubroot disease occurs in the roots. The pathogens usually invade from root hairs or young roots and form tumors on the main or lateral roots. Commonly known as "cerebral disease." The initial surface is smooth and white, after which the color becomes brown, rough and cracked. It is easy to be rotted and stinked by other germs. The upper part of the main root or base of stem is decayed due to the lower part, and some new roots can be grown. When seedlings are seriously damaged, they can die. In the adult stage, the leaf color of the lower leaves of the plants became pale, the plants were short, and the outer leaves were wilting at noon, and they could recover sooner or later. A few days after the onset of severe disease, wilting could not be restored, and finally the whole plant died. Those with mild disease are able to become strong if they have sufficient fertilizer and water. However, the plants are slender, the branches are reduced, and the yield is drastically reduced.

"There are five aspects of the root cause of rape root tuber disease, soil, climate, variety, fertilization and seeding methods." Wang Shuang said that the clubroot disease is a soil-borne disease. Once it occurs, it is difficult to achieve the desired results for ordinary prevention and treatment, and it is better to adopt comprehensive prevention and control measures.

According to reports, comprehensive prevention and control measures must first use resistant varieties. It is recommended that towns with severe disease incidence should choose relatively resistant varieties such as apricot oil No. 2 and Deyou No. 5 in combination with local varieties. Implement rotation. Due to the strong stress resistance of the sleeping leopards, rape fields that are severely affected have four to five years of rotation. Do not grow rapeseeds and cruciferous vegetables within the prescribed rotation period. Light-onset plots can be rotated for one year to reduce the occurrence of wheat.

Nursery transplanting. For 3 years or more, no cross-crop crop field or slightly alkaline soil was used as a seedbed. The seedbed was used with 400-fold 50% enemy or 50-fold for formalin, and 50% carbendazim with 300-fold solution was also acceptable. Disinfect. Seed treatment. Through wind, sieving, drying, elimination of pests and inferior seeds, seeding was performed after 1:800 seed dressing.

Strengthen fertilizer and water management. The seedbed uses potassium-comprising compound fertilizer and boron fertilizer as the base fertilizer, less nitrogen fertilizer and superphosphate, and strengthens the drainage and dehumidification to cultivate strong seedlings. After transplanting at the 5th leaf stage, remove the infected strains during transplanting.

Seedling chemical control. The true leaf development period of rape is a critical period of prevention and control. The whole seedbed can be sprayed or sprinkled with 70% chlorothalonil 600 to 800 times or 70% thiophanate 600 to 800 times. When transplanting, 2% lime water can be used as setting water.

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