How to Identify and Control Malicious Weeds and Flaverias in Wheat Fields

I. Identification of Gramineous Weeds in Gramineae of Wheat Fields: Wheat is one of the main food crops in our city. The growth of weeds seriously threatens the harvest of wheat. In recent years, with the continuous improvement of the level of wheat production and the use of similar chemical herbicides for many years, the corresponding changes have taken place in the weed populations in the wheat fields of our city, especially in the cross-region operations of the combine harvester in recent years. The more and more, the larger the scope of the occurrence, the more serious the degree of harm, so the wheat field weed has a serious threat to the city's wheat production. Malicious weeds in wheat fields are dominated by bromegrass, aegylle, wild oats, acorns, and bristles. The key period for the removal has so far been that in order to facilitate farmers' identification, their identification methods are now described as follows:
(I) Morphological characteristics
1. Bromegrass: The main characteristics of the seedling stage are: leaf blade shape, stems and leaves, leaf margins and ears are hairy. When mature, panicles develop, with 3–7 branches per section. Each branch has 1-4 spikelets in the upper part, and each spikelet contains 7-14 small flowers.
2. Wild oats: The main characteristics of the seedling stage: the leaves are broadly stripe, and the stems and leaves, leaf margins, and ears are hairless. At maturity, the panicles develop, towering, branching, sparsely spikelets, each spikelet containing 2-3 florets.
3. Aegilops taurica: The main characteristics of the seedling stage: leaf blade shape, stems and leaves more slender than brome, leaves above the rough, sparsely pilose, leaf margin auricle villi. When mature. The spikes are about 10 cm long, and the spikelets are round-shaped, containing 3-5 flowers and clinging to the internodes of the rachis. They break off one by one as they ripen.
4. Look at Acacia: The main symptoms at the seedling stage: The leaves are long and nearly upright. The panicles form a rounded, pale green, spikelet containing 1 flower, densely located on the rachis. It is to look at Ale. It is Japan that looks at Acacia.
5. Swine fever: commonly known as wet banana. Basal part of the branch, four prismatic, edge, leaf margin and leaf back are barbed. Leaves 4-8-round, blade-shaped, oblanceolate. Umbrellas axillary or terminal.
(B) Prevention and control methods: The main use of medicines in autumn is prevention and treatment, supplemented by spring extraction. At present, there are obvious morphological features. If no prevention or treatment is carried out, it must be removed in a timely manner to reduce the number of wheat weeds this year and achieve a sustained high yield of wheat.
Second, yellow top chrysanthemum
1. Morphological characteristics: Flaveria is an annual herb. Rapid growth, leafy foliage, its length is similar to Jerusalem artichoke, stem erect, plants ranging from a few centimeters to 3 meters, blade oblong acuminate, leaves alternately opposite, leaf margins sparse and neatly serrate, basal pupil 3 Parallel veins.
2. Main census sites: wasteland, roadside, ditch, graves, buildings, etc. Census time: three large-scale surveys in May, July and August.
3. Prevention and control technology: Chemical control in June, July and September, manual removal of scavenging in October.
(1) Chemical control: Flaveria bidentis and 20% paraquat or 41% glyphosate per acre with 30 kg of laundry powder and 15 kg of water before spraying. (2) Manually pull out: Near the farmland, seedlings, and small-density plots, find one, remove one, find one, and eliminate one.

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