Phenomenon 1: Zotroxacin has a quick effect, but it encounters a lot of rain, especially in spring, after use, it is easy to rebound later.
Reason: The oxazolone destroys the cell membrane of the weeds, and the leaves quickly dry and die. After 3-4 hours, the weeds appear poisonous symptoms and die in 2-4 days. This is what the farmers' friends say is “quick effectâ€. As a contact herbicide , oxazolone has no systemic, no dead roots, no rain, no spray, and is easy to cause weeds to resurrect.
Suggest:
1. The oxazolone has poor systemic absorption, and can be mixed with a highly systemic herbicide to achieve complementary advantages, such as: oxazolone + diflufenacil; oxadiazon + sodium dimethyltetrachloride.
2. When using the medicine, it must be two barrels of one mu of land - three barrels of water, sprayed and sprayed through it (Zoxarone is used as a contact herbicide, only the weed leaves are evenly stained with liquid medicine, which will kill grass) .
Phenomenon 2: Zolapoxanes sometimes have poor effects, especially in cloudy and low temperature conditions, and are also prone to phytotoxicity.
Reason: The efficacy of oxazolone has a certain relationship with the light conditions. After the application, the light conditions are good, which is beneficial to the full effect of the drug, and the cloudy day is not conducive to the normal effect of the drug. When the temperature is above 10 °C, the speed of killing grass is fast, and the speed of spraying and killing grass at low temperature will be slower.
Recommendation: Choose a clear weather, no wind or breeze, from 10 am to 3 pm (preferably at noon temperature is relatively high), the temperature is 8 ° C -25 ° C, spray. Note that the temperature is too low (below 5 degrees Celsius), too high is likely to cause phytotoxicity.
Phenomenon 3: In the wheat and peanut rotation area, farmers like to use oxadiazon. For the use of fensulfuron for many years, it is no longer the first choice for medication, reflecting the effect of benzenesulfuron on peanuts.
Reason: The half-life of oxadiazon in the soil is only a few hours, the safety is very good, and the safety of the crop is high. Due to the use of fensulfuron-methyl for many years, weeds are resistant to drugs, and the dosage is getting larger and larger, which causes residual phytotoxicity to the glutinous peanuts. It has been shown that the use of bensulfuron-methyl is 4 months after use to grow peanuts.
Phenomenon 4: Some farmers friends know that oxazinone has high safety. In order to improve the herbicidal effect, it is easy to cause phytotoxicity when used in dosage.
Reason: The safety of oxadiazon is relative. It is usually used after the wheat clover is one heart and before the jointing, when the weeds are basically out. If the dosage is too much and the concentration of the liquid is too large, the phenomenon of burning leaves will occur. The effective dosage of the general mu is about 1 gram to 1.8 grams.
Suggestion: Use medicine in the winter of last year. Due to the small seedling age of wheat and poor resistance to weeds, it is recommended to use a low amount of 1 gram of oxadiazon, two barrels of water per acre (15kg a barrel); Before the festival, due to the large number of wheat leaves and the strong resistance of weeds, it is recommended to use a high amount of about 1.5 grams, two acres of water - one bucket of water (15kg a bucket).
Phenomenon 5: The effect of oxazolone is good, but there are many things to pay attention to when mixing, and some farmers' friends are foggy and blurred.
Reason: The oxazolone contact herbicide, if mixed improperly, will cause contact damage.
Suggest:
1. Xanthonone can be mixed with herbicides such as bensulfuron-methyl, diflufenacil, sodium dimethyltetrachloride and bensulfuron-methyl which are used to control broadleaf weeds.
2.oxazolone can not be mixed with the emulsion type product, such as the 20% chlorofluoxyacetic acid emulsifiable concentrate mentioned at the beginning of the article; in use, no additives such as washing powder, silicone, and spreading agent can be added, otherwise it is easy to crop Produce phytotoxicity.
3. Mixed use of oxazolone and herbicide weed herbicide: oxazinone and 3% methyl disulfuron dispersible oil suspension, 6.9% fenoxapropanol EC, 15% acetylene ester Mixed with emulsifiable concentrate; as far as oxazolone can be mixed with 70% flurazuron-water dispersible granules and 15% acetylene oxalate water emulsion herbicides, it is recommended to use a small area experiment to confirm the safety and then apply it in a large area (I personally do not It is recommended to mix).
4. Zoxoxadone is not recommended to be mixed with other insecticides , fungicides and control agents, especially organophosphorus and carbamate pesticides .
Phenomenon 6: In the case of low temperature (below 5 ° C), heavy spray, no secondary dilution, etc., what should I do?
Suggest:
1. The symptoms of wheat phytotoxicity are mild and not serious. Generally, it recovers spontaneously within one week and does not affect the yield.
2. The symptoms of wheat phytotoxicity are relatively heavy, and there is no need to worry too much. The urea is applied 5-10 kg/mu to promote wheat tillering.
Phenomenon 7: Some farmers think that oxazolone is relatively safe, regardless of the growth of wheat seedlings, and arbitrarily use drugs.
Recommendation: In October this year, in many provinces, the rains were more than the same period of the previous years, and the wheat was sowed too deep (the wheat planting depth was 3-5 cm), which caused the wheat in some areas to be weak and the roots were more pests and diseases. For these very weak wheat, prudent use of drugs, first to improve the growth of wheat seedlings.
More pesticide knowledge , please pay attention to China Pesticide Network
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