It is a non-selective and residue-free herbicide, which is very effective against perennial rooted weeds and widely used in rubber, mulberry, tea, orchards and sugarcane fields.

In recent years, glyphosate herbicide damage has occurred from time to time in rice fields. Some of these phytotoxicity are caused by improper use of glyphosate, some are filled with other pesticides in pesticide bottles (barrels), some are just sprayed with glyphosate and applied to rice fields, and some are caused by glyphosate drift. Its phytotoxicity has become one of the factors affecting the high and stable yield of rice, which should not be underestimated.

Glyphosate is an inactivated herbicide and cannot be used in rice fields. When the normal weeding concentration is 1000ppm, rice plants will lose their green color and die early. However, at the lower concentration of 300ppm, rice did not wilt and stalk withered, but caused a series of allergic reactions of rice plants. First, the heading of rice was seriously blocked, and there were no heading and abnormal ears. Although some of them can heading normally, rice is not strong, and most of them are empty grains. Some of them have the phenomenon of multiple spines in the same position and low position. Second, the tillering of plants increased, and the phenomenon of high node tillering and high node root system appeared. Third, the flag leaves become shorter and smaller, often shorter than normal plants 1/3~2/3, and some flag leaves are less than 5 cm in length. The leaves of the affected plants are dark green in the late growth stage, and there is little yellowing. The agricultural technology department has observed the injury symptoms of low concentration glyphosate in hybrid rice, and found that the plants were damaged, dwarfed, the rice leaves turned yellow, the stem nodes at the base of the rice began to rot, the heart leaves withered, and the longitudinal rolls were whiplike, forming a false dead heart. Tillering began in about 7 days, with many tillers, dark green plants clustered, and aerial roots appeared on the basal nodes of susceptible rice. During the young spike differentiation stage, the growth of main stem was inhibited, plants became shorter, internodes became shorter, aerial roots also appeared on internodes, and tillers increased, resulting in multiple diseases. At booting stage, rice plants often can't heading, the stalk of ear axis is light brown to brown, and the tissue is necrotic, but the rice leaves are normal and don't die. The author observed the phytotoxicity caused by the abuse of low concentration glyphosate in late rice. The results showed that the leaves turned green in the afternoon after spraying glyphosate on a sunny day, and the heart leaves turned green and withered the next day, and resumed at night. On the third day, the heart leaves became fake dead hearts, and on the fourth day, the heart leaves turned yellow and died, and the plants were dwarfed. A week later, the tillers of the plants increased, and the roots grew well. After 10 days, aerial roots appeared in the internodes of rice stems, and young panicles differentiated at the top of the stems.

The harm of glyphosate in rice production is more and more serious, especially glyphosate, which should be well packaged and labeled, and it is advocated to store glyphosate in special herbicide medicine bottles for easy identification. Farmers are required to use glyphosate once and thoroughly clean the sprayer after use. It is best not to use it in windy days to prevent drift hazards. When glyphosate is damaged in rice fields, remedial measures must be taken immediately. Generally, the remedial effect is good after being damaged by glyphosate at the peak tillering stage and early panicle differentiation stage, but it is not good at booting stage, especially at the late booting stage. Remedial measures: First, wash with muddy water. Because glyphosate quickly loses its activity when it meets the soil, rice field water can be stirred into mud, and rice plants can be washed with mud to reduce phytotoxicity. The second is to wash the seedlings with water. In low-lying paddy fields, after glyphosate is abused, flood water can immediately pour over the top of rice plants, and it is best to irrigate with muddy water several times. This method can basically avoid losses. Thirdly, spraying 92o (gibberellin) promoted the growth and development of young panicles. You can use 1 g of 92O powder per mu, first add a little alcohol to dissolve it, and then add 50~60 kg of water to spray it. When spraying 92o, potassium dihydrogen phosphate can be added to each mu of liquid medicine.

100 ~ 120g or 1 leaf (5ml), and after 7 days, topdressing 5 ~ 7.5kg urea per mu of field to promote post-disaster transformation of rice. The remedial effect is closely related to the growth period of rice. If the growth period is early, the effect of timely remedy is good, otherwise it is poor. Suggestions: The main reason for the phytotoxicity of low-concentration glyphosate in rice is that farmers buy empty bottles of glyphosate from pesticide sales units, such as Jinggangmycin, dimehypo and so on. Because there is no label, it is used as jinggangmycin or dimehypo to control pests and diseases, and the dosage per mu is mostly 100 ~ 200ml, which is sprayed from the young panicle of rice to the booting stage, thus causing glyphosate damage to the reproductive growth of rice and often leading to poor rice harvest. To this end, first, we call on pesticide production enterprises to strictly manage trademarks according to pesticide registration requirements, do a good job in small packaging and labeling of glyphosate, and advocate the preparation of special herbicide medicine bottles for easy identification; Second, pesticide sales departments are not allowed to purchase glyphosate in large packages and supply it separately, so as to avoid misuse by farmers; Third, farmers don't want to use the copyright of Family Rural Information Network to store glyphosate. They should buy glyphosate as needed, use it once and clean the sprayer thoroughly after use.