What are the common weeds in wheat fields? How to control them?
Time:
2022-12-13
According to the weed control needs, weeds can be divided into three categories: grass weeds, dicotyledonous weeds (broadleaf weeds) and sedge weeds. Among them, wheat field weeds are mainly the first two categories. There are about 19 species of weeds with different ecological conditions, and about 24 species of weeds with different local distribution and damage.
Common weeds in wheat fields
According to the weed control needs, weeds can be divided into three categories: grass weeds, dicotyledonous weeds (broadleaf weeds) and sedge weeds. Among them, wheat field weeds are mainly the first two categories. There are about 19 species of weeds with different ecological conditions, and about 24 species of weeds with different local distribution and damage.
Broad-leaved weeds in wheat fields are dicotyledons, herbaceous or woody, with 2 cotyledons in the embryo, broad leaves, petioles, and reticulate veins. The common broad-leaved weeds in wheat fields are, sowing artemisia, pig's-eye, bracken, small quinoa, shepherd's purse, knotweed, miva pot, currant blue, spurge, small spineflower, etc.
Grass weed is a monocotyledonous plant, embryo has 1 cotyledon, stalk cylindrical or flattened, with nodes, internodes hollow. The leaf sheath is open, with ligule, no petiole, parallel leaf veins, narrow and long leaf blade, so it is also commonly known as "sharp-leaved grass". The common grass weeds in wheat fields include wild oats, wheatgrass, knapweed, ryegrass, matang, bullrush, dogwood, etc.
Classification of herbicides
There are two main types of chemical weed control in wheat fields: soil sealing treatment and selective stem and leaf treatment. Soil sealing treatment is applied evenly to the soil surface after sowing and before emergence to control the emergence of weeds. Soil sealing treatment can not be applied according to the weeds, and it is not effective enough for large seed weeds and perennial weeds, and the herbicidal effect is influenced by soil characteristics, and the efficacy is not stable; while selective stem and leaf treatment is based on the type and number of weeds that have emerged in the field, and the corresponding herbicide is selected for prevention and removal.
Selective stem and leaf treatment is a widely used chemical weed control method in wheat fields, and most of the herbicides sold in the market are also selective herbicides. Selective herbicides all have a certain spectrum of weed killers, and farmers must choose according to the main weed species in the field when selecting them.
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