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At present, the main resistant weeds in the rice crop fields in mainland China are Barnyard grass, Qianjinzi, weedy rice, wild cucumber, duck tongue grass, hollow lotus seed grass (water peanut) and so on. The main varieties of herbicides used in paddy fields are dichloroquinolic acid, cyanofluoxate, pentaflusulfachlor, oxazolamid, butachlor, prochlor, benzsulfuron-methyl, pyrisulfuron-methyl, bendasone, 2-methyl4chloro and their compound preparations.
1. Oxazolamid
Oxazolachlor is safe for rice and can effectively control the main weeds in paddy fields, such as barnyard grass, goldenrod, horsetail and cow tendon grass. It is mainly used for transplanting and direct seeding of rice field weeding. Low toxicity, safe for the environment, and widely mixable. A single dose is sprayed through foliar spray, mainly to control annual grass weeds in transplanted and direct seeding fields. It is an ACC enzyme inhibitor that can inhibit the synthesis of plant fatty acids.
Precautions: Within a few days after the application, the sensitive varieties appear foliar greening, inhibiting growth, and some varieties dry up and even die 2 weeks after application.
2. Dichloroquinolineic acid
Dichloroquinolic acid is a special selective herbicide for the control of barnyard grass in paddy fields, which is a hormonal quinoline carboxylic acid herbicide, and the symptoms of weed poisoning are similar to those of auxin, which is mainly used for the prevention and control of barnyard grass and has a long application period, and is effective at 1-7 leaf stages. Rice is safe.
It is mainly used for barnyard grass control in paddy fields. It can also prevent and control rain flowers, field cyanine, cress, duck tongue grass, and saponaria. Barnyard grass can be applied at 1-7 leaf stages in the transplanted field, with 13.5-26 grams of active ingredients per mu, spray, drain the water before the medicine, and return the water to the field after the medicine, and maintain a 3-5cm water layer. After the 2.5 leaf stage of the seedlings in the direct seeding field, the dosage is the same as above.
Notes:
(1) The amount of residue in the soil is large, which is easy to produce pesticide damage to the back stubble, and the back stubble can be planted with rice, corn and sorghum. Solanaceae (tobacco, potato, pepper, etc.), umbelliferae (carrot, celery), quinoa (spinach, sugar beet), malvaceae, cucurbitaceae (various melons), legumes, Asteraceae, and spindle crops are sensitive to the drug.
(2) It can be mixed with chlorpyran, benzsulfuron-methyl, pyrisulfuron-methyl, propanil, cyanofluoxate, etc. to expand the herbicidal spectrum.
(3) In some areas, dichloroquinoline acid was used in excess of perennial amounts, resulting in accumulated pesticide damage in the field. If it is used too early, excessively, or the water retention overflows the heart leaves and is easy to be harmed, the typical symptoms of dichloroquinolic acid to rice are the appearance of green onion seedlings (the heart leaves are longitudinally rolled and healed into onion tubes, and the leaf tips can be expanded), and the leaf color is relatively normal; The new leaves cannot be extracted due to the healing of the upper tissues, and the new leaves can be seen to roll up when the stalks are peeled off. The symptoms of pesticide damage generally appear 10~15 days after application.
3. Biscaether
After application, dioxaether can be quickly absorbed by the stems and leaves of weeds, and transmitted to the whole plant, inhibiting the growth of plant meristems, thereby killing weeds. Efficient, broad-spectrum, and extremely low dosage. Dioxaether can effectively control barnyard grass and other grass weeds in paddy fields, and also treat most broadleaf weeds, some sedge weeds and barnyard weeds that are resistant to other herbicides. It has a special effect on older barnyard grass and double-spike paspalum, which can kill barnyard grass at the 1-7 leaf stage.
Direct seeding paddy field: It can be used after the emergence of direct seeding rice and before heading, and the best effect is applied at the 3-5 leaf stage of barnyard grass.
Transplanting field or seedling throwing field: Rice transplanting field or seedling throwing field should be transplanted or thrown 15 days later, after the seedlings return to green, so as to avoid premature drug use, poor drug resistance of seedlings, resulting in pesticide damage.
Drain the field water before application, so that all the weeds are exposed, irrigate 1-2 days after application, and maintain a 3-5 cm water layer for 4-5 days. It should only be used for weeding in rice fields, not on other crops. Japonica rice varieties have yellowing of leaves after spraying this product, which can be recovered in 4-5 days without affecting the yield. Barnyard grass can be used at the 1-7 leaf stage, the barnyard grass is small, use a low dose, and the barnyard grass is large, use a high dose.
Notes:
Dichloroquinolic acid-resistant barnyard grass also developed resistance to cyanofluoxalate and bisoxane after two consecutive years of application of cyanofluoxalate and bisoxalin, and the resistant barnyard grass population had compound resistance. In some areas where bichlorfen has been used, it is necessary to pay attention to this point and be cautiously optimistic about the control effect in the field, so as not to be affected by poor control effect.
4. Pyrimidine oxidine ether
Pyrimidine oxime grass ether is a broad-spectrum selective post-budding herbicide. It has selective ultra-efficient post-budding weeding activity for rice, common wheat and knotweed, no pre-budding herbicidal activity, and is used to control various grasses and broad-leaved weeds such as barnyard grass, large spike wheat lady, spicy knotweed, etc., and is safe for rice and common wheat.
Notes:
The weeding speed of the pesticide is slow, and the weed growth can be inhibited after application, but it must die after 2 weeks. The drug is moderately wide, and it is effective for the 1.5~6.5 leaf stage of barnyard grass. At the 2.5~3.5 leaf stage, 100% can be prevented with a dose of 10g/h; 3.5~4.5 leaf stage, increase to 20g/h dose, 100% control.
5. Penflusulfam
Penflusulfamin is a conductive herbicide, with a wide range of herbicidal spectrum, and has a good control effect on a variety of common weeds in paddy fields, including barnyard grass, annual sedge and a variety of broad-leaved grasses, and the effective period is as long as 30~60 days, and a drug can basically control the weed damage in the whole season. Penflusuchlor is safe for rice, can be used from the first leaf stage to the mature stage of rice, and is also safe for subsequent stubble. Some weeds that have developed resistance to sulfonylurea herbicides also have good control effect with this product.
Notes:
The application method can be sprayed or mixed with soil. The product is very safe for rice, and when the dose is ultra-high, it has a certain inhibitory effect on the growth of rice roots in the early stage, but it recovers quickly and does not affect the yield.
6. Cyanfluoxate
Cyanfluoxate is a selective herbicide in paddy fields, which can only be treated as stems and leaves, and the pre-bud treatment is ineffective, and has a certain control effect on young barnyard grass, and can also be controlled, Ma Tang, double-spike paspalum, dogtail grass, cow tendon grass, Kanmai Niang, etc., and is ineffective against sedge weeds and broad-leaved weeds. It is efficient to a thousand gold. Cyfluoxate is the only aromatic phenoxypropionic acid herbicide that has a high safety profile for rice and, like other varieties in this class, is a systemic conductive herbicide.
From the absorption of cyanofluoxalate to the death of weeds, it usually takes 1-3 weeks. The symptoms of weeds after application are as follows: the shoots in the four-leaf stage atrophy, leading to death. The old leaves of the two-leaf stage change very little and remain green.
Notes:
The drug is highly toxic to aquatic arthropods and avoids its flow into aquaculture sites. When mixed with some broad-leaved herbicides such as pyrimidine huanglong, it may show antagonistic effects, which is manifested as a decrease in the efficacy of cyanofluoxate.
7. Chlorofluoropyroxyacetic acid
Chlorofluoropyroxyacetic acid is a systemic conductive post-seedling herbicide, which is quickly absorbed by plants after the drug, so that sensitive plants have a typical hormone herbicide reaction, and the plants are deformed, distorted, and eventually die.
Ethylhexyl chlorofluoropyroxyacetic acid is converted into chlorofluoropyroxyacetic acid for herbicidal effect, and 288 g/L of chlorofluoropyroxyacetic acid is equivalent to 200 g/L of chlorofluoropyroxyacetic acid. With the increasing area of direct seeding rice, chlorofluoropyroxyacetic acid is also slowly applied to direct seeding rice to control some broad-leaved weeds, the most common are purslane, duck broadgrass, knotweed and water peanut.
Notes:
Do not add silicone when chlorofluoropyroxyacetic acid is used for weeding, and then it should be used before the jointing stage after the four-leaf stage of rice.
8. Dimethyltetrachloride
Dimethyltetrachloride is harmful to the root system of rice, and it was used in many places before pulling seedlings, thinking that this would make the seedlings swelling and thickening or cracking. It is a selective hormonal herbicide. Its mode of action is the same selectivity as 2,4 drops. However, its volatility and action rate are lower and slower than that of 2,4 drops of butyl ester EC, so it is safer to use than 2,4 drops in cold rice areas. The seedling stage of gramineous plants is very sensitive, and the resistance gradually increases after the 3~4 leaf stage, and the sensitivity is strongest at the end of tillering, and the sensitivity of panicle differentiation increases, so it is advisable to apply pesticides at the end of rice tillering. It is suitable for rice, wheat and other dryland crops to control triangular grass, duck tongue grass, Ze Yuan, wild cucumber and other broad-leaved weeds.
Notes:
Dimethyltetrachloride is harmful to the root system of rice, and it was used in many places before pulling seedlings, thinking that it would make the seedlings easier to pull.
The 3rd Rice Quality Improvement and Yield Increase and Plant Health Technology Exchange Conference
Meeting time and place
May 16 (15th registration), Chaohu, Anhui
Organization of meetings
Organizer: "Agricultural Resources Herald" Title Sponsor: Recruitment Co-organizers: Liufuding Crop Protection Co., Ltd. Shanghai Mingde Lida Biotechnology Co., Ltd. Jiangxi Xinruifeng Biochemical Co., Ltd. Zhejiang Xinyinbang Biotechnology Co., Ltd. Zhonghe Tiancheng Agricultural Development (Wuhan) Co., Ltd. Hubei Yipule Crop Science and Technology Co., Ltd. Anhui Maoshi Agricultural Technology Co., Ltd. Organizers: Anhui Houtian Seed Industry Co., Ltd. Anhui Huifuqiang Agricultural Technology Co., Ltd. Anhui Meiyoujia Agricultural Technology Co., Ltd
Conference Topics:
1. The status quo and management trend of rice pesticide product registration 2, the market analysis and future forecast of rice purchase price 3, the high-yield and high-efficiency cultivation technology and main promotion mode of rice 4, the occurrence trend and control status of rice diseases, insects and weeds 5, the prevention and control strategy of rice weeds "sealing, killing and supplementing" 6, the medication scheme and control technology of resistant weeds such as barnyard grass and goldenrod 7, the medication scheme and control technology of insect pests such as the two chemical borer 8, the medication scheme and control technology of rice blast, rice koji disease and bacterial diseases 9, Selection and Technology Sharing of Pesticides for Efficient and High Yield of Rice Planting 10. Market Opportunities of "Plant Conditioning + Nutrition" in Improving Rice Quality and Increasing Yield11 New Prevention and Control Strategies for Rice Diseases, Insects and Weeds, New Products, New Technologies, etc.12, Pesticide Channel Marketing Rules in the Era of Large FarmersMore reports are being determined......
Conference Registration
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Registration & Collaboration Consultation
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............................................................ Please indicate in the following format for reprinting: Article source: Agricultural Resources Herald Editor: Peng Leyao Review of this issue: Zhai Yiting Producer of this issue: Zheng Hongyan
