Chlorimuron ethyl phytotoxicity measures

In previous article, we briefly discussed on injury symptoms and a brief analysis causes after using Chlorimuron ethyl; today, we can talk about how to deal with the injury symptoms.

Here, I want to keep the point on two aspects about preventive and remedial measures.

Preventive measures

1. Accurately calculate the amount of Chlorimuron ethyl. Depending on soil and climatic conditions, grass love Chlorimuron ethyl determine the dosage, to the amount of quasi-chemical control area to area medication, accurate dilution, uniform spraying, do not re-spray, do not leak spray, can not be arbitrarily increased drug concentration and spray Shi times.

2. Strictly in accordance with suitable period of medication, scientifically formulated liquid, determine spraying period. Necessary to consider the sensitive period of weeds, for good control effect, but also to choose seasonal crops resistant to strong, safe time “Xiacha” crop spraying. 3-5 leaf stage of corn has the strongest resistance on Chlorimuron ethyl, then the safest medication.

If the weather and other reasons, the 6-leaf stage of corn after the medication, as directed spray, pharmaceutical avoid touching the heart of corn leaves. General 2-leaf stage of corn leaf stage before and 10 after are sensitive to Chlorimuron ethyl, not medication. Meanwhile, the solution should be accurate dilution, mix well before spraying.

3. To improve the level of application techniques and strict chemical control procedures. Guiding farmers to eliminate the existing old-fashioned poor performance manual sprayers, and introducing them good performance, high efficiency, low cost, new sprayers.

Currently there are better performance Shandong Wish Plant Protection Machinery Co., Ltd. produces WS-16P type sprayer and Shandong Huasheng Pesticide Co., Ltd. production Tarzan-18AC knapsack sprayer duster machine. As Chlorimuron ethyl herbicide is super efficient, re-spray, drip, it is likely to cause local agent concentration is too large to produce injury. In addition, before each medication must ensure that sprayer clean, avoid the other Yaoxie corn injury caused by pesticide residues.

In addition, naphthalic anhydride with corn seed coating can reduce Chlorimuron ethyl with organophosphate insecticides effect caused by the injury.

Remedial measures

Generally, the corn itself has strong resistance, Chlorimuron ethyl a slight phytotoxicity, without treatment, only temporarily inhibited growth of corn, can be restored after a period of time, does not affect the production. If severe injury, need to be addressed, we can use the following measures:

1. A Timely detoxification in Chlorimuron ethyl phytotoxicity has occurred or is about to occur, to take early measures to detox. On the initial injury on corn plants that can be used 3-5 times spray equipment wash water spray pesticide residues on plants.

2. To strengthen field management

(1) Pouring enough water, prompting a lot of corn roots absorb water to reduce the concentration of the herbicide plant body, relieve injury.

(2) Appropriate to increase the depth and frequency of hoeing, enhance soil aeration, and promote beneficial soil microbial activity, accelerate the decomposition of soil nutrients, enhance maize root under water and nutrient absorption capacity, so as soon as possible to restore normal maize plants growth and development.

(3) Spraying large cloud -120 (natural brassinolide) diluted 1500-fold or GA plus 1% urea aqueous solution or spiritual harm, leaf treasure diluted 500 times in the morning or evening dew dry with sprayer to spray both sides of the blade, and promote normal growth of plants, in order to effectively reduce injury.

(4) The injury occurred corn plots should be combined with water, increasing livestock manure composting facilities, ammonium bicarbonate, ammonium nitrate, urea and other fast-acting fertilizer to promote root development and regeneration, restoring victims corn physiology to reduce Chlorimuron ethyl phytotoxicity to corn damage. But also foliar spray of 1% -2% urea or 0.2% -0.3% potassium dihydrogen phosphate solution or Huimanfeng 600-800 times, resume normal growth favorable for corn. Should also actively controlling other corn pests, in order to improve the ability of maize to resist injury.

If the cornfields injury is the too heavy, these measures can not relieve victims extent, you can only take one or switching to other crops destroyed to avoid greater losses.

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Chlorimuron ethyl injury causes

Chlorimuron ethyl is widely used for the current corn postemergence foliar treatment agent, the agent and the prevention and treatment of a broad spectrum effect is good, but the market reaction to the drug serious injury, this paper, the pharmaceutical injury symptoms, causes, preventive measures and phytotoxicity after remedial measures to do a brief overview of the application for the pharmaceutical technical guidance.

Chlorimuron ethyl(CAS NO: 90982-32-4) is currently the most widely used postemergence foliar treatment agent, suspending agent was 4% in corn 3-5 leaf stage, after a homogeneous basic weed foliage spray, 0.9-1.5 liters per hectare (equivalent to 36-60 g active ingredient / ha), can control crabgrass, goosegrass, foxtail, wild millet, redroot amaranth, quinoa, sedge weeds.

The agent is the uptake and sulfonylurea herbicides can be absorbed through the plant stems and roots and quickly xylem and phloem conduction, by inhibiting acetolactate synthase activity, impeding the synthesis of branched-chain amino acids, which affects plant cells division, so that weeds stop growing and eventually die.

After absorption of pharmaceutical weeds stop growing very quickly, usually in 4-5 days after spraying toxic symptoms appear, damage symptoms of heart leaf yellowing, chlorosis, leaf tip, leaf sheath purple. About 20 days of annual weeds killed more than 6 leaves perennial broadleaf weeds suppressed, stop growing, high doses can be fatal.

In recent years, some areas administered Chlorimuron ethyl, some maize varieties grown conventionally produced a more serious injury. Now on injury symptoms, a brief analysis causes.

Phytotoxicity symptoms

After spraying Chlorimuron ethyl 5-10d corn leaf chlorosis, yellow, or irregular chlorotic leaf spot in corn 3-5 leaf stage. Some leaves curling into a tubular shape, margin shrinkage, heart-shaped leaves oxtail, not normally draw. Corn growth was inhibited, plant height, and may have some profusion of secondary stems. Return to normal growth of the light injury, severe affecting production.

Cause injury

1. Excessive medication: fails to herbicide use as specified in doses of medication, mistaking increase the amount of the herbicidal effect can be increased, resulting in excessive drug use, high concentrations cause injury.

2. Improper medication: during the crop growth period with herbicide sensitivity varies. Chlorimuron ethyl general rhythm of corn postemergence use the 3-5 leaf stage, 2-leaf stage or less than 6 leaves, easy to produce injury.

3. Herbicide spraying inappropriate: the part of farmers lack of awareness on Herbicide, not in strict accordance with the instructions, five -leaf stage of corn in the summer is not directed spray after spraying, and even pesticides used simultaneously, a large number of liquid Shi Xiangyu m leaf artificially causing injury. Meanwhile, organophosphorus pesticide spraying corn ethyl Takatoshi sense to smoke, so with the use of organophosphorus pesticides intervals not exceeding 7 days, will produce injury.

4. Sprayer cleaning without a net: a soybean field Herbicide spray failed to timely and thorough cleaning, and then spraying it Chlorimuron ethyl, easy to produce injury on corn.

5. Sprayer poor performance or non-standard field operations: such as multi-nozzle spray nozzle flow is inconsistent, leaking, resulting in excessive localized spray volume. Spray when fighting drugs uneven spray rate link with overlap, resulting in excessive localized spray volume, but also easy to make corn suffer.

6. Weather Factor: corn growth stage low rainfall, high temperature and drought, easily impact on maize growth, corn slow growth, reduced resistance to herbicides, decomposition function to reduce phytotoxicity, many latent injury into explicit drug harm. After spraying, cold and rainy, less light, corn also prone to injury.

7. Individual maize varieties of tobacco itself ethyl Takatoshi sense such as sweet corn and burst varieties. Different types of corn resistance to the drug is different, the patience of the order of durum> General Type> Cape sweet> burst.

This article, we briefly discussed on injury symptoms and a brief analysis causes after using Chlorimuron ethyl. The next time I will given the appropriate response measures according the reasons.

Want to learn more information about Chlorimuron ethyl, you can access the guidechem.com. Guidechem.com is just a place for you to look for some chemicals. Guidechem provide the most convenient conditions for the international buyers and let these leads benefit all the business people. Guidechem chemical B2B network provides information on china and global chemical market quotation and relative chemical Information. Guidechem Chemical Network providing the most complete information of the chemical industry.