Weeds cause of relapse and Countermeasures

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 , spray uneven. Based on the investigation , at the same herbicide doses acres knapsack sprayer 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 manual sprayer spraying , and strive to have , thoroughly. Spraying directly affects the quality of the herbicidal effect , require the use of manual sprayers spraying , mu liquid volume of not less than 30 kg , to ensure that no re-spray , spray does not leak .