1. Herbicidal effect of flufenacet in corn field and safety of crops
Herbicidal effect of flufenacet in corn field:
At 10 g ai/hm2 dose, 10% flufenacetate EC against valerian, golden foxtail, crabgrass, chloris, wild pheasant, ryegrass, toxic wheat, brome, stevia, ramie, and relict The visual control effects of Solanum nigrum L. and A. chinensis are 80%, 90%, 90%, 95%, 70%, 20%, 30%, 30%, 10%, 0%, 10%, 0%, 10, respectively. %; at 30g ai / hm2 dose, the control effect is 100%, 100%, 100%, 100%, 95%, 90%, 80%, 90%, 20%, 0%, 70%, 0%, 90%, indicating that under the greenhouse conditions, flufenacet has good control effect on grass weeds, and has certain inhibitory effect on some broad-leaved weeds, and against the grass, at the dose of this experiment. Ineffective for castor and nightshade.
The ED90 values ​​of flufenacetamide against valerian, golden foxtail, crabgrass, chloris, wild pheasant, ryegrass, toxic wheat, brome, aphid, amaranthus and comfrey were 11.32 ga.i. /hm2, 10.00g ai/hm2, 10.01ga.i./hm2, 6.48g ai/hm2, 16.48ga.i./hm2, 30.93g ai/hm2, 42.32ga.i./hm2, 30.80g ai/hm2 187.54ga.i./hm2, 47.51g ai/hm2 and 24.25ga.i./hm2, indicating that flufenacet has good herbicidal activity against grass weeds, and some broadleaf weeds (duck Grass, amaranthus) have herbicidal activity.
Safety of flufenacet to crops:
10% flufenacetamide EC produces safe and no phytotoxicity to corn, soybean, cotton, peanut, broad bean, kidney bean and transplanted rice at a dose of 100g ai/hm2. For spring wheat, winter wheat, sunflower, adzuki bean, radish and watermelon A certain inhibitory effect, direct-screening rice, cucumber, rapeseed, cabbage and cabbage sensitive to flufenacetamine visual inhibition rate of 50% ~ 100%; 10% flufenacetamine EC at 200g ai / hm2 dose against corn, peanuts , broad bean and kidney bean safe and no phytotoxic symptoms, slightly inhibited soybean and cotton, visual inhibition rate of sunflower and winter wheat were 10% and 20%, spring wheat, direct seed rice, transplanted rice, cucumber, rape, cabbage , Bean cabbage, radish and watermelon are more harmful, and the visual inhibition rate is 40%~100%. It can be seen that flufenacet has good safety to corn, soybean, peanut, cotton, broad bean and kidney bean.
In addition, flufenacet can also be used for the control of sweet corn weeds, which can effectively prevent broad-leaved weeds such as annual grass weeds and water peanuts such as goosegrass, crabgrass, and valerian. When the test agent is more than 600g ai/hm2, the control effect and fresh weight control effect of flufenacetine SC on goosegrass, crabgrass, valerian, water peanut, etc. are all above 80%, and the plant defense against total grass The efficacy and fresh weight control effect is above 85%, the effect period is about 30 days, and the environment is friendly, and the growth of sweet corn is safe. With the increase of the dosage, the control effect is enhanced, and the optimal dose of the product is recommended to be 600~840g ai/hm2.
2. Field trials of cornfields containing flufenacet
Up to now, flufenacet has applied for 20 field trials in China, including 19 flufenacetamide single doses, 20%, 41%, 60%, 500 g/L. The mixture is one. (See Table 3)
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