Although it is fortunate that nonchemical
pest control measures are fairly consistent over the years,
chemical controls are ever changing. Chemical labels change
often and so do chemical recommendations for control of
insects, diseases, and weeds. Be sure to refer to your
product label every time you purchase a product, even when
using a product that you have used in the past. Two good
sources of current chemical recommendations are Illinois
Homeowners’ Guide to Pest Management and Illinois Commercial
Landscape & Turfgrass Pest Management Handbook, 1998–1999.
The former will be updated every two or three years, while
the latter will be revised every other year. A chemical
update that has occurred since those two publications went
to press follows. This information was obtained from Dr.
John Hartman at the University of Kentucky.
Immunex is the homeowner-use formulation of the fungicide
propiconazole and is no longer being manufactured. Two other
familiar products containing propiconazole are Alamo and
Banner. They are still available. Immunox is the
homeowner-use formulation of the fungicide myclobutanil.
Immunox at first contained propiconazole, but the
formulation has been changed so that it now contains
myclobutanil. It is possible that both products are on the
shelf, but new supplies will contain only Immunox
(myclobutanil). Immunox is fairly new, so look for it in
garden centers as an option for powdery mildew control and
other common fungal diseases on ornamental crops. Always
read the label carefully for crop clearance and specific