Planting technology sharing: identification and control technology of grass weeds
Gramineous weeds are common weeds in rice and upland rice cultivation. Effective identification and control can help crops grow better. Today, Hui Nongwang Xiaobian will tell you about the identification and prevention techniques of grass weeds.  
First, the identification of weeds
1, Miscanthus
Over-year-old or annual herb, stalk silk, erect or slightly inclined, 15~90 cm high, 2-4 knots, broad-leaf blade, leaf sheath glabrous, transparent membranous after leaf, narrow inflorescence, erect Or obliquely rising; small spikes flat, usually containing 1 small flower, 3 mm long, dislocated under the stalk, sessile, into two rows on the side of the cob; two stalks of equal length, marginal membranous, The back is gray-green, with pale green horizontal stripes, and the outer scorpion is lanceolate, with 5 veins. It has a short pointed tip that protrudes out of the genus. The inner iliac crest is slightly shorter than the outer scorpion. The caryopsis is long-shaped, yellow-brown, and the seeds multiply. Widely distributed throughout the country, low-humidity farmland, riverbed or wet edge of the water is common, some wheat and rice are seriously damaged.
2, thousand gold
Herbs annual, stalks, upper erect, base knees, 30~90 cm high, with 3-6 knots, seed propagation, mainly distributed in rice fields, low wet and dry fields.
3, beef tendon grass (蟋蟀è‰)
Herbs annual, stalked, sometimes nearly erect, 15–90 cm tall, leaf blade, spikes, arranged in a finger-like arrangement at the top of the pole, small spikes densely on one side of the cob, fruit ovate If there are obvious wavy wrinkles, the seeds multiply and are distributed in the damp farmland or roadside.
4, Bermuda root (Herb)
Herbs perennial, with rhizomes or stalks up to more than 1 m in length, and rooting and branching in nodes, erect parts 10 to 30 cm tall, leaf-like, spike-like, arranged in a finger-like manner at the top of the culm. The spikelets are arranged in two rows on one side of the cob, and the caryopsis is long-shaped, mainly distributed by stolons, and distributed mostly in moist farmland.
5, chloris
Herbs annual, stalks, erect oblique or stalk knees, lower flowers firm, upper flowers infertile and entangled into a spherical shape, grainy narrow elliptical shape, light brown, transparent, seed reproduction.
6, look at Mai Niang
Over-year-old or annual herb, stalks sparse, weak, smooth, stalk often knee-curved, 15~40 cm high, leaf sheath usually shorter than internodes, leaves nearly erect, cone-like inflorescence narrowly cylindrical, pale green, spikelets Intensively above the cob, the anthers are orange-yellow or gray-white, and the caryopsis has a long elliptical shape and the seeds multiply.
7, the head grass
Over-year-old or annual herb, stalks, scatter or basal knees, sometimes nearly erect, 15 to 75 cm high, 4 to 5 knots, 5 to 15 cm long, 4-9 mm wide, smooth and lint sheath Most of them are shorter or lower than the internodes, and the seeds multiply.
8, bluegrass
Over-year-old or annual herb, stalks clustered, thin, erect or slightly inclined, 8~30 cm high, leaf sheaths mostly closed from the middle, no hair, leaf membranous, flower head, leaf texture soft cones inflorescence, caryopsis Near spinning cone, seed reproduction.
9, rice Li Shihe (you grass)
Herbs perennial, stalked, basal stalks or roots stalked, 20-100 cm high, often with inverted micro-hairs on the nodes, leaf-like lanceolate, hard, often involute, smooth or rough leaf sheath, cone Inflorescence, the main axis is thin, the branches are slender, with horns, stolons or seeds.
10, 稗
Herbs annual, stalks, erect or stalk knees, 50-130 cm high, leaf blade-shaped, glabrous, leaf sheath smooth, ligule-free, cone-like inflorescence, erect or slightly curved, racemes often divided Branches, obliquely or adnate, spikelets containing 2 flowers, ovate-shaped, long-flowered 3 mm with hard bristles, densely on one side of cob, locules 3-5 veins, first outer snails 5-7 veins The apex often has 5 to 30 mm awns, and the third outer sputum has small pointed ends, rough, marginal entanglement, nectar, ovate, beige, and seed reproduction.
11. Rice bran (Hipper, alfalfa)
Annual herb, plant height 50~130 cm. The stalk is erect or base curved, with branches and leaves without hair strips, middle ribs are blue and white, and the edges are finely serrated. The leaf sheath is smooth, cylindrical, without leaves, and is wrapped around the stem section. The ear is 5-10 cm long, with a conical inflorescence, with branches, no awns or short awns. The first one is longer and the outer stalk is grassy. The flowering period is from July to August, and the caryopsis is oval and beige. The whole plant turns from pale green to dark green or slightly purple. It is extremely humid, and is born in rice fields and surrounding wetlands, and is propagated by seeds.
12, Chang Mangye
The main difference from the rice blast is that the long awns, awns and spikelets of the 3-5 cm are often purple-red.
13, drought and flood
Herbs annual, stalks, 10 to 30 cm long, 6-12 mm wide, glabrous, apex acuminate, margins thickened, often involute when dry; leaf sheath smooth and glabrous, leafless, narrowly inflorescence Softly bent down, small spikes wide ovate to spine shape 4-5 mm long, light green or slightly purple, less hair, no sessile or slightly puberulous, 1-2 cm long, fruit mature It starts to fall off and the seeds multiply.
14, no mansions (floor 稗)
Herbs annual, stalks stalked, erect or slanted, 90-120 cm tall, leaf blade, 20–30 cm long, 6–10 mm wide, glabrous, margins rough, leaf sheath smooth, glabrous, liguleless, conelike The erect, the grain edge is ripe, the seedlings are flat at the base, the leaves are half-clawed, purple-red, and the base has extremely thin hair, and the seeds multiply.
15, Mang (稗光稗å)
The main difference with cockroaches is that the main inflorescences are arranged far apart on the main axis and have no branches. The length is no more than 2 cm, and the spikelets are 2-2.5 mm long. The apex is sharp and awnless, and is arranged in a regular row of 4 rows. One side of the cob.
Second, prevention measures
1. The following pesticides are recommended for control of weeds in the paddy field: He Da Zhuang, Mefenacet, Arozine, etc.
2, pool lice and malignant weeds recommended Han Letian, quinclorac and other agents for drug control.
[Expanding knowledge]
  Gramineae : annual or perennial herbs, few woody. Usually with rhizomes, the ground stems are called stalks, mostly cylindrical, often hollow, less solid, with distinct nodes and internodes, leaves alternate, arranged in two columns, each leaf consists of two parts, the leaves and the sheath. The leaf sheath is covered with stalks, often open longitudinally on one side, and rarely closed in a cylindrical shape; the leaves are located above the leaf sheath and have a flat band shape, with a flat vein, a medial junction of the leaves and the sheath, and a membranous or hairy shape. Leaf tongue. The shape and size often vary from plant to plant, and there are often protrusions on both sides of the stem of the leaf.
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