Wheat farmers who grow wheat know that Triticum aestivum is a worldwide malignant weed. Because of its close relationship with the genus Triticum, common herbicides are difficult to control. At present, metsulfuron-methyl is more effective for Triticum aestivum.
There are two periods for the emergence of winter wheat fields: one is the autumn emergence period, which is mainly 15-20 days after the wheat sowing, and from late October to mid-November, the peak of emergence before winter is formed (weeds that emerge during this period account for approximately 70% of the total); the other is the spring seedling period (some seedlings still emerge from late February to March the following year).
According to the occurrence characteristics and regularity of Jiejie wheat, and the prevention and control practices in many places, the prevention and control should be "focused prevention and comprehensive prevention", and measures such as chemical weeding and manual removal before winter should be implemented.
First, stop seed dissemination and keep the seed quarantine. Jiejie wheat has strong tillering power, many transmission channels, and it is difficult to identify at the seedling stage. Therefore, it should be based on prevention at present.
It is necessary to insist not to transfer seeds from the area where the wheat harvest occurs. At the same time, we must select wheat seeds to prevent the spread of weed seeds. (The appearance of the seeds of Jiejie wheat is very similar to wheat kernels, but its size is only about 1/3 of wheat kernels, and its thousand-grain weight is much smaller than wheat, with an average of about 14.5 grams).
Jiejiemai relies on seeds to spread. To control the spread, we must first strictly observe the seed barrier. All seeds that are mixed with knotty barley must be selected to prevent the infestation of areas that have not yet occurred.
The second is manual removal and centralized burning. Combining with the management of the wheat field, completely remove the knotted wheat. The seedlings and adult stages of Triticum aestivum are easier to identify in the field. The base of the seedling stage is purple-red, the new leaves are drawn into a tube shape, and the expanded leaves are long, narrow and thin; the width of the leaves after tillering is less than that of wheat. 1/2, the thickness is about 1/2 of wheat; the plant is slightly higher than wheat after heading, and the ear shape is obviously different (the ear is cylindrical).
It must be removed in time, all sizes are removed together, and there is no future trouble. Attention should be paid to taking the plucked Jiejie wheat out of the field and burning them together. At the same time, weeds on the side of the field should be removed to reduce spread and spread.
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