Causes and remedial measures of 2,4-D injury in cotton fields

Causes and remedial measures of 2,4-D injury in cotton fields

A few days ago, the author encountered a severe 2,4-D herbicide injury in a cotton field at Sunlei Zhaicun Road, Guantao County. The victimization rate is over 70%. According to the memory of the owner of the cotton field, Liu Xingmin, he did not know whether he had used the 2,4-D herbicide and looked at the miserable pattern of more than three acres of cotton. Liu Xingmin was anxious. On June 13th, a reader of Hengshui (0318-2110695) also called inquiries about the damage caused by 2,4-D to cotton fields. His forest-damaged rate in the cotton fields reached 1/3. Causes of harm In fact, similar situations occur every year. The author believes that there are three main reasons: 12,4-D herbicides are still used by cotton farmers within a certain range. Among them, 72% 2,4-D butyl ester has a rapid herbicidal effect on wheat field “Sorkhorn”, and is also “blindly admired” by some people; some people apply 56% or 70% of 2 potassium 4 chloride (English generic) Name: MCPA-Na) In addition to the treatment of corn field "triple grass" (vanilla, aconite), it has buried potential hazards. The author particularly reminds: In addition to its own very low cost, in line with some people's psychology of greed, but more important is that some pesticide manufacturers and county-level dealers "profit-driven" intentionally create a market - the cost is very low, To change the name of a compelling product, one can “get a handful”, such as “wheatgrass kill light” in wheat fields, “vanilla”, “vanilla”, and so on. Many people use these 2,4-D herbicides in the end and it is still unclear what exactly is used! 2 Due to the large drift of 2,4-D herbicides, the use of adjacent plots may also cause cotton damage. 3Because sprayers that use 2,4-D herbicides are difficult to clean, residues in sprayers, measuring cups, water tools, and booms are easily shared, resulting in cotton, peanuts, soybeans, fruit trees, vegetables, etc. It is prone to injury. The main remedial measures need to remind farmers that many of the current alternatives to 2,4-D herbicides have already “had their heroic qualities” (such as “Meibao” in the field of wheat weeding and tribenuron-methyl, and “treasure in corn fields”. Grass "can be used nicosulfuron type "Yu Nong Le," etc.), eliminating the need for 2,4-D herbicide is imperative. There was a 2,4-D herbicide damage. The main remedial measures were as follows: 1 The damage was relatively light, and the deformed leaves and branches of the victim's performance could be promptly dismantled; if the damage was severe and the top of the cotton plant was deformed, the top could be destroyed. , use 2 to 5 leaf branches to achieve a certain amount of production (depending on the density of the field, leaving less dense, leaving more). 3 timely water and fertilizer management. Focus on nitrogen and potassium fertilizer application, with the water topdressing urea 10 to 15 kg, while spraying 0.5% of the urea plus 0.1% of the high-potassium phosphonium or 0.3% of potassium dihydrogen phosphate. 3 regulate plant growth. Can be sprayed with “920”” (gibberellin) 1 or 2 times (note that the amount and frequency of use should not be excessive to prevent crop growth). Or spraying brassinolide 2 or 3 times, alternating with foliar fertilizer Use better.