PPDL Picture of the Week
September 28, 2020
Fall broadleaf weed control applications
Glenn Hardebeck, Turfgrass Research Agronomist, Purdue Universty
We are quickly approaching the best time of the year for
controlling most perennial broadleaf weeds here in Indiana. While a good fall fertility program should be
the primary approach to reducing weed problems, in most situations, fall is
also the best time to apply broadleaf herbicides. Broadleaf applications made during October
and November are more effective at killing the entire weed rather than merely
“burning off the top” which is likely with spring applications. Winter itself appears to help out. While the herbicide may kill many weeds
outright, still more weeds may be weakened to the point of succumbing to
winterkill. The end result is less weedy
flowers in the spring including those lovely yellow dandelions. So, mulch those leaves this fall and take a
walk in the lawn to look for broadleaf weeds.
Consider treating them now rather than waiting until they flower in the
spring.
Tips for Improving Control during the Fall
- Apply
during sunny days above 55 degrees F
- Check
weather forecast to avoid rain after application
- Mulch
or remove leaves before treating
- Avoid
mowing the area for several days after application
- Spray
applications are generally more effective than granular (weed and
feed-type) when applied correctly
- Granular
fertilizer/herbicide combinations should be applied to wet turf
- Application
should be uniform and at the correct rate (a little extra is not always
better)