How to choose white gourd herbicide?
1, look at the gourd field weed species
Herbicides generally have selectivity, and the effects of different herbicides on weeds are different. When farmers choose herbicides, be sure to read the product labels or instructions carefully, or buy them under the guidance of agricultural technicians. The chosen herbicide should be safe for the crops used, while weeds on crop fields are efficient.
2, look at the size of the gourd field weed
Medication, weed size of herbicides in general; weed is small, weak resistance, better efficacy, weed germination is sensitive to herbicide application, is the best period of soil treatment agent, with stem and leaf treatment is different, the weed is too small, the contact of the medicine area is small, is not conducive to the efficacy of absorption, if the weed is too large, it will reduce the resistance, efficacy, therefore, stem and leaf treatment in weeds 2 ~ 4 leaf stage optimal medication.
3. Look at the resistance of weeds in winter melon fields
In general, the use of herbicides for long time, area single herbicide, because the selection pressure of the reagent, weed resistance, herbicide effect is poor, so you should use the recommended dose limit (Gao Jiliang), and should choose a different mechanism of action of herbicide for use in order to improve the efficacy of the wheel.
How do you use the winter melon herbicide?
1, grasp the use of dosage, if the dosage is too large, it will produce phytotoxicity.
2, grasp the use of inappropriate use of pesticides, herbicides and crop sensitive period anastomosis, it will cause phytotoxicity. For example, during the germination period of rice seeds, the use of grass killing pills, Butachlor and two chloro quinoline acid, etc., can lead to the decrease of rice emergence rate, the decrease of seedling quality and the withering of seedlings. Herbicides such as 2.4-D butyl and paraquat could be applied to the wheat before and after the 3 leaf stage and from jointing stage to flowering stage, and then the phytotoxicity of wheat, leaf and leaf would affect the heading.
3, choose the right way to look at improper methods of spraying, but also produce phytotoxicity. If the wheat field uses oat, when the soil depth is not proper, the wheat is planted with the same depth, which can cause phytotoxicity. Soil treatment agent was used in the treatment of seedlings, stems and leaves, and leaf and leaf treatments were not available for soil treatment. Spraying of herbicide requires sufficient spraying liquid, and generally do not use a low capacity sprayer.
4, uniform spraying herbicide spray applicator or whether good medicine, medicine and soil fertilizer, should strive to achieve a uniform. Uneven application, easy to produce phytotoxicity or weed control, the effect is not good.
5, grasp the pesticide interval, the same crop using two agents, should have the appropriate interval, the interval is too close, will also produce phytotoxicity. Such as the use of propanil simultaneously or shortly, and use of organophosphate or carbamate insecticides, the rice loss of propanil detoxification capacity, and the occurrence of injury.
