Shangyincheng, Hongyao Town, Yishui County, said on the 1st of December that a local 0.7-mu rape plant is in the 5- to 6-leaf stage, and 20% to 30% of the plants in the field are rotted at the root neck. Acetochlor was used to seal the soil of rapeseed after transplanting. The field soil was dry after application. He asked whether the rotting of the roots of rapeseed was not related to acetochlor.
Acetochlor is a selective pre-emergence herbicide. The drug can be absorbed by young shoots of plants. The monocotyledonous plants are absorbed by the budding sheath. The dicotyledonous plants absorb and transmit through the hypocotyl and interfere with the metabolism of nucleic acids and protein synthesis in the plants. The young roots stop growing. If the water in the field is suitable, the young shoots will be killed when they are unearthed; if the soil moisture is less, the weeds will work with the increase of soil moisture and absorption of drugs. The gramineous weeds will be curled and the other leaves will shrink and the whole plant will shrink. Withered. The oilseed rape was damaged by acetochlor, which showed that the plants were obviously short, the leaves turned purple and spoon-shaped, and the leaf area was about one-fifth of normal leaves. According to the situation reflected by Shang Yincheng, rot of the roots of rapeseed is not related to acetochlor injury, which may be caused by other reasons.
On December 4th, the Agricultural Technology 001 Workshop received Shang Yincheng's rape seedlings delivered by special express delivery. Examination of the diseased plants showed yellowing and rot at the root neck, and a small amount of white hyphae in the diseased part. Only one of the infected strains had a complete root system, and the other strains did not have a root system. Roots of the diseased plants with roots grew normally, but the roots and necks rotted and contracted, and the shoots and roots were almost disconnected.
The plant disease research institute of Jiangsu Academy of Agricultural Sciences made a pathological analysis of these diseased seedlings. According to the bacteria sampled and isolated from the diseased department, there are two types of bacteria and fungi, but it is currently impossible to determine which pathogen is the main pathogenic bacteria. Chen Huaigu, an expert in plant diseases research at the Provincial Academy of Agricultural Sciences, said in an interview with reporters that to determine what kind of disease caused, further field disease strains need to be further diagnosed. If the diseased part has bad odor, it may be caused by bacterial infestation. The bacterial disease that causes rape above symptoms may be soft rot disease; if the disease part does not have stench, it may be caused by fungal infection and may cause rape to appear above. Symptoms of fungal diseases are mainly damping-off and blight.
The prevention of soft rot in rapeseed can be selected from the early stage of onset of drug sprays such as zesin zinc, mettosole, mesitactin, chlorobromoisocyanuric acid, basic copper sulphate, colupamin copper, thienson copper, and spring thunder king copper. Note alternate medication. Rapeseed is sensitive to copper preparations, and it is necessary to strictly control the dosage so as to prevent phytotoxicity. The zearalenium, chlorobrominated isocyanuric acid and copper preparations have a broad spectrum of bactericidal effects and have good control effects on fungal diseases. The prevention and control of rapeseed blight can be selected at the early stage of disease, such as sodium propionate, mycophenolate, methyl-tocopherol and other drugs. Sodium sulphide is easily photolyzed and should be used immediately. The prevention of damping-off of rapeseed can be used in the early stage of the disease, such as hymexazol, sodium sulphofenate, propamocarb, metalaxyl zinc manganate, and cream manganese zinc.
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