Tan Liyun: Can you shoot the tongue? How old is wheat? Now that the grass is very large, is it the grass that was not removed before?
Chen Qingyuan: It is grass in a cornfield, a bit like ryegrass, with 1.2 acres of land more than 20 days ago weeding with the preferred insecticide 40 ml, feeling no effect on this grass.
Tan Liyun: It is more ryegrass. The ryegrass seedling base leaf sheath is bright and dark brown, smooth and glabrous, the upper leaf sheath is green; the leaves are dark green, the surface has a thick waxy layer, is oily, and is not easy to contaminate water droplets; loose between the leaf sheath and the stem, this The lingual tongue is small or inconspicuous. The leaves of the adult plants were dark green, flat and glabrous. The veins and leaves were uneven and slightly rough. The lingual tongues were prominent and grew up to 4 mm. The stems were hard and erect, and the stem segments were red-brown and slightly swollen.
The preferred 4% thixodichlor dispersible oil suspension agent has better control effect on Lolium multiflorum, and can effectively control the grasses such as bromegrass, hardgrass, aphid, Japanese amaranth, etc. Wild broadleaf weeds, sowing wormwood and other broad-leaved weeds, dwarfed by weed poisoning, yellowing and browning of leaf color, and eventually complete death does not rebound. The drug has a slow action and it takes 4 to 6 weeks for the weeds to die under low-temperature and dry conditions. The above-mentioned 1.2 mu of ground wheat was sterilized with 40 ml of preferred insecticide, and the amount of the herbicide was more than enough. It should have better control effect on Lolium multiflorum. From the picture, some weeds have yellowed leaves and should have been poisoned. Then check whether there is poisoning in the growth point of weeds. If it has been poisoned, it will gradually die. When using this medicine to control old ryegrass, it is necessary to spray the weeds with sufficient amount of water and the amount of water, otherwise the control effect will be affected. Some parts of Suining and other regions have strong resistance to the insecticide Lolium multiflorum ryegrass, and the population is larger, and the use of control effects in these areas will decline.
Triazolopyrin, methylsulfuron-methyl and other drugs also have good control effect on Lolium multiflorum, wheat field can also timely use these drugs to control Lolium multiflorum, try to apply in the weeds 2-5 leaf stage. The safety of oxazoline oxalate to wheat is relatively good. Spraying weeds with sufficient amount and amount of water also has good control effect on older ryegrass. The drug's adaptability to low temperature is relatively good, but it should be Avoid short-term cool down in the case of strong cold weather. Methylsulfuron has higher technical requirements for pesticide application and should be applied strictly according to standard techniques. It should be used to control Lolium multiflorum in wheat fields and try to control the application of pesticides when the weed age is too large. Can only inhibit its growth, as in the picture of the more productive older ryegrass, 30 grams per liter of methylsulfuron can be dispersed 30 ml of oil suspension is also difficult to completely eliminate it, but can be effective Inhibit its growth and development and flowering.
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