In the actual process of chemical weed control, there is a part of the plots is not completely dead grass, weeds recurrence. If the area is small, less weed, it can be considered a normal phenomenon. Because the weeding process will inevitably occur leak spray, light spray of the phenomenon, while in the weed communities will inevitably be part of the emergence of resistant weeds, chemical weed control is not 100 percent results. But if there is a large area of recurrence, they should pay attention to it. After years of observation the author concluded that the presence of weeds recurrence following reasons:
1, herbicides too quick result, only wheat as an example: if one is leaf tag azole grass herbicide, weed fast when weed is only slightly above the ground to kill the majority of blades, and miscellaneous dead grass and roots growing point, easy to relapse.
2, herbicide solution concentration is too high, also caused rapid killing blades, undead roots phenomenon.
3, too little water spraying, back pack sprayers uneven. Based on the investigation, at the same herbicide doses acres sprayed a bucket of water (about 15 kg), the recurrence rate than acres sprayed three buckets of water 20% higher.
Responses: 1, quick and slow-acting herbicide solution reasonable ratio problem. Such as: Tribenuron + Fluoroglycofen ether formulations, if Fluoroglycofen ether the amount of acres more than 20 ml (10% EC), the speed of 3-5 days dead grass, weeds on tribenuron absorption and conduction decline, weeds easy to relapse.
Therefore, we can control the dead grass in 7-10 days time, thus reducing the recurrence of weeds, proved tribenuron + Fluoroglycofen ether formulations to 10% tribenuron 12-15 g +10% Fluoroglycofen ether 8 ml is appropriate.
2, improve the quality of spraying, and strive to have, thoroughly. Spraying directly affects the quality of the herbicidal effect, require the use of manual manual sprayer spraying, mu liquid volume of not less than 30 kg, to ensure that no re-spray, spray does not leak.
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