In recent years, the dominant species of weeds in wheat fields in China have undergone major changes, which has made it difficult to manage them.
First, weeds in grasslands are on the rise in the country. In the dry winter wheat area, the degree of occurrence of aggradation of wheat, wild oats, brome, and aegis is aggravated. For example, the acacia weeds mainly occurred in the rice-winter winter wheat area and spread to Hebei, Shandong, Henan, and Shaanxi provinces. The frequency of ryegrass weeds, candle grass, etc. increased in the Yangtze River basin and Shaanxi provinces. .
The second is the increase in the density of regionally difficult weeds. For example, in the northwest region, such as wheat fields, dense flowers, peas, wild oats, etc., in North China, Maijiagong, Zeqi, and bowl blossoms;
The third is the rapid development of drug-resistant weeds. More than 60% of the fields in Jiangsu, Anhui, and Hubei provinces found resistance to Japanese aphid populations, and seven provinces (cities), such as Hebei, Shandong, Henan, Shaanxi, Shanxi, and Jiangsu, discovered the anti-herbicide tribenurum. The resistance index of S. sophia in some crops in Hebei Province was as high as 1400, resulting in the failure of the chemical control system for the target herbicide tribenuron-methyl.
The fourth is to aggravate the highly mimicry of weeds in crops. For example, thallus was spread to 11 provinces including wheat, Hebei, Henan, Shandong, Shaanxi, and Jiangsu, and the area of ​​production exceeded 30 million mu.
Fifth, it is more difficult to control perennial weeds. For example, perennial weeds, bowl flowers, field bindweeds, and spiny vegetables are seriously endangered in local areas and chemical agents are difficult to remove.
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