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pattern of Newpath injury in CLXL745

Newpath injury to rice

Newpath injury to rice published on No Comments on Newpath injury to rice
pattern of Newpath injury in CLXL745
pattern of Newpath injury in CLXL745
Newpath injury symptoms on rice plants
Newpath injury symptoms on rice plants

 

The images above are of CLXL745 sprayed with two applications of 4 ounces of Newpath.  It was sprayed with a ground rig with a sophisticated control system that is supposed to prevent overlapping and skipping.  The problem was not noticed until the second application.  Clearly there was a serious overlap problem.  The accurate guidance system probably contributed if the malfunction occurred on both the first and second applications.  If it did, then these areas got 16 ounces of Newpath.  If it only malfunctioned on the second spraying then the affected area received 12 ounces of Newpath.  If this had not been a hybrid the injury might not have been as serious, but it still would have had an effect.  With only one copy of the resistance gene the plant is overwhelmed.  The only thing to do here is call a priest and fix the spray rig.

Herbicide injury in rice

Herbicide injury in rice published on No Comments on Herbicide injury in rice

These three photographs show herbicide injury related to application problems.  The variety is CL161 which has excellent herbicide tolerance.  The field had been sprayed with a mixture of Newpath, Permit, and Grasp plus a crop oil.  From an undetermined cause the herbicide application was uneven with some areas getting too much herbicide resulting in the pattern shown in the top photo.  The bottom left picture is of plants in the affected area.  The bottom right photograph compares the root systems of affect plants on the left and “normal” plants on the right.  Clearly there is reduction in root mass.  This is NOT root pruning.  The affected roots are not short and stubby, there are just less of them and those present are not as long as the unaffected.  True root pruning results in damage to the root tips where growth occurs.  The consequence is a short, stubby root or a root obviously missing the root tip.  The first type of pruning can happen when herbicides containing pendimethalin (Prowl, Stealth) contact the root.  The second type of purning usually is the result of insect feeding as in the case of rice water weevils or disease such as root rots or hydrogen sulfide toxicity.  Twenty or thirty years ago most herbicides had a 2X measure of safety built into them, but today’s herbicides do not.  It was already a pretty hot mixture and overlapping the pattern caused injury.

herbicide injury in rice
Spray pattern of herbicide injury in rice
 

herbicide injury to rice plants
Close up view of herbicide injury to several rice plants
 

herbicide injury to rice roots
A comparison of injured roots (left) and normal roots (right) of rice

Recovery from Command Injury

Recovery from Command Injury published on No Comments on Recovery from Command Injury
Command injury to rice
Command injury to riceRice recovery from Command injury

Above are two photographs.  The first one appeared in an earlier edition of Field Notes showing Command injury to Cheniere.  The second one was taken Thursday in the same field.  While there is a little stand loss most of the rice has recovered very well.  If the entire field had been affected the same way some yield loss could have been expected, but not in this instance.

 

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