According to information released by the National Agricultural Technology Promotion Center recently, due to factors such as higher accumulated temperature in winter and spring, the occurrence period of rape pests and diseases in early spring is ahead of schedule, and the degree of occurrence is higher than normal. As of March 4, the incidence of rapeseed pests and diseases in the country was 23.04 million mu, which was 9% less than the same period of last year, but it was 6.6% higher than the average value in the past five years.
It is reported that the area of ​​rapeseed sclerotiorum occurred in the country was 435 million mu, a decrease of 31.5% from the same period of last year. Affected by the higher temperatures in winter and spring than in normal years, the sclerotia of the sclerotinia germinate earlier in most regions. Southwest and southern regions have entered the period of onset of leaf disease, and some stems have begun to invade stems. Jianghan and the middle and lower reaches of the Yangtze River are in the leaves. At the early stage of disease, the incidence of downy mildew nationwide was 9.2 million mu, which was 7.1% higher than that of the same period of last year. It mainly occurred in the southwest, south of Yangtze River, and in the middle reaches of the Yangtze River. It occurred in all parts of Zhejiang, and the highest disease rate was 60% in the southwest and south areas. ~100%; The area of ​​locusts nationwide was 9.03 million mu, a decrease of 10.1% from the same period of last year. The main production areas of autumn rape were widespread, with an average of 100 strains in each province (city), and 10 to 50 in Anhui and Jiangsu.
According to the forecast of the National Climate Center, in the middle and late March, the cold air forces affecting China are weak, and most of the temperature in the autumn sown rapeseed production areas in China has risen significantly, which is higher than the corresponding period of the year. Among them, the temperatures in Huanghuai and Jiangnan districts are 1-2°C, which is beneficial to the occurrence of drought-loving pests such as rapeseed locusts, and the precipitation in Jianghan, Jianghuai, mid-north-central Jiangnan, and western South China is slightly more than usual. The rainfall is 15 to 40 millimeters and the local area is 50 to 70 millimeters. It is conducive to the proliferation of diseases such as Sclerotinia sclerotiorum and downy mildew. It is expected that in the middle and late March, rape pests and diseases will enter a period of high incidence of damage, rapeseed sclerotia in the middle and lower reaches of the Yangtze River, most of the southwestern locusts, etc. will focus on the above degree.
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