What are the common diseases of rapeseed?
Now is the season of rapeseed flowering. With the increase of rapeseed area year by year, the prevention and control of rapeseed disease is a problem that is easy to be ignored in rapeseed production. So, what diseases are common in rapeseed?
First, rapeseed downy mildew
Rapeseed occurs from the seedling stage to the flowering stage, mainly affecting the leaves, stems, flowers and pods of rapeseed. The symptom is that the lesions are not obvious in the front of the damaged leaves, and the lesions are polygonal, and a white frosty mildew layer grows on the leaf back lesions.
Rape downy mildew prevention and control measures:
1. Rotate with non-host plants for 2 to 3 years to avoid continuous cropping with cruciferous crops.
2. Chemical control. In the early stage of the disease, timely spraying and prevention. It is generally sprayed when the rate of diseased plants in the early flowering stage of rapeseed is 10% in early March. Generally, the interval is 6~8d, and the drug is used continuously for 2~3 times. You can choose 75% chlorothalonil wettable powder 100g, or 64% antivirus WP wettable powder 500 times evenly spray.
Second, rapeseed sclerotium disease
Rapeseed sclerotium disease is commonly known as "white stalk". This disease can occur in rapeseed to adult stage, and it is most serious after flowering. In the onset of seedling stage, the stem base and petiole form red-brown spots, which occur in adult stage, starting from the leaves of basal senescence, and the initial dark cyan water-stained plaques, which later become round or irregular large spots. The pathogen invades the stem, and initially appears as a water-stained light brown lesion. Until the disease is advanced, the stem pulp is hollowed out, the cortex is longitudinally split, and it is easily broken. Many black mouse fecal sclerotia are formed in the stem. The whole plant with severe stem disease died.
Rape sclerotium disease prevention and treatment method:
1. The rotation is changed.
2, the control agent can be 50% speed Keling 50g or 40% sclerotium net 50g or 80% methyl thiophanate 50g spray 50kg evenly, according to the condition of spraying 1~3 times, each interval is 7~10 days .
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