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Band applications of herbicides are less common than band applications of insecticides
because weeds need to be controlled in the entire field and not just in or on the
plant area. Banding herbicides in row crops is not uncommon, however, and has several
advantages. The primary advantages are reduced cost and herbicide carryover in the
soil. Banding over the crop row is often combined with cultivation. Cultivation
is cost effective with immediate gratification. Determining the rate of application
when making band applications is sometimes misunderstood and or abused. The application
rate should be the same for both band and broadcast applications but the treated
acreage will differ depending on the band width. If, for instance, a 50% band is
applied on a 10 acre field, 5 acres will be treated. The amount of both water and
herbicide should be calculated for 5 acres. This is fairly straight forward but
often misunderstood. The key is to calculate the amount you put in the tank based
on the actual area that will receive the chemical, not the total area in the field.
It can be tempting, when the herbicide is inexpensive and easily accounted for,
to apply higher than labeled rates to increase weed control. A good example of this
is the use of glyphosate on roundup ready cotton. Although crop safety is well known
with this herbicide, there are some instances where other herbicides can cause injury
at higher than labeled rates. More important, however, is that this practice increases
the possibility of herbicide resistance. Selection pressure for resistant biotypes
increases with higher than labeled rates. The rapid increase in the number of glyphosate
resistant weeds in the Midwest has been alarming. One of the primary reasons for
this has been the progressive increase in application rates to control tough weeds.
Increasing rates is a short term solution that can cause long term problems.
To contact Barry Tickes go to: btickes@ag.arizona.edu.
Real IPM
To contact Barry Tickes go to: btickes@ag.arizona.edu.
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For questions or comments on any of the topics please contact Marco Pena at the Yuma Agricultural Center.
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