Kentucky Integrated Pest Management
Annual Summary 1992
Eleven counties participated in formal county-based Integrated Pest Management
(IPM) programs in 1992. These programs included 410 fields with a total
of 13,877 acres. This is half again the number of fields enrolled in 1991.
Independent scouting consultants, informal and trial county programs,
and farmer-scouts encompassed an additional 111,479 acres. All together,
more than 125,000 acres were involved in some phase of integrated pest
management during 1992.
More than three-fourths of the acreage enrolled in county-based IPM programs
was planted in corn. Soybeans accounted for 13% of the acreage and wheat
6%. Alfalfa (3%) and tobacco (1.1%) were relatively small components of
the total picture. No grain sorghum fields were enrolled in formal IPM
programs in 1992.
The most common disease, insect, and weed pests were arbitrarily identified
as those affecting 50% or more of the fields planted in a given crop.
Most of the common diseases under this definition occurred in wheat. These
included Glume blotch, Head scab, and Septoria nodorum
leaf blotch. Other common diseases in 1992 were Leaf spot in
alfalfa and Septoria brown spot in soybeans. At least some
fields exceeded reporting values for each of these diseases, with Leaf
spots in alfalfa and S. nodorum leaf blotch having the highest
percentages of affected fields over reporting value.
Alfalfa weevil and Potato leafhopper were widespread in
alfalfa. Aphids were reported to be common in alfalfa, wheat, and
tobacco. European corn borer, Flea beetle, and Western corn
rootworm beetle were the common insect pests in corn. Over 70% of
soybean fields reported Bean leaf beetle, although very few were
over the reporting value. Green cloverworm was also common. In
addition to Aphids, tobacco fields reported Flea beetle
and Tobacco budworm in over 50% of surveyed fields. Armyworm
was common in wheat. Only Alfalfa weevil and Potato leaf hopper in alfalfa
showed significant numbers of fields over the reporting values for these
A large number of weeds were reported as common in the crops surveyed;
most weed pests were over their reporting values in the majority of fields
affected. These included Chickweed and Johnsongrass in
alfalfa; Crabgrass, Cocklebur, Horsenettle, Morningglory, and Pigweeds
in corn and soybeans; Common milkweed, Fall panicum, Giant foxtail,
Honeyvine milkweed, Trumpetcreeper, Wild sweet potato, and Yellow
nutsedge in corn; Johnsongrass in soybeans and Chickweed
and Wild garlic in wheat.
Extension specialists were asked to provide lists of pests of particular
concern for each crop in the IPM program. Pests in this category found
in alfalfa in 1992 included Leaf spots, Phtophthora root
rot, Alfalfa weevil, Potato leafhopper, Chickweed, Dock, Crabgrass, Mustards,
and Thistle. Only a small amount of Stewart's wilt was found
in corn, plus European corn borer, Black cutworm, Fall Armyworm, Armyworm,
and the three corn rootworm beetle species (Northern, Southern,
and Western). Weeds of particular concern in corn included Johnsongrass,
Shattercane, Honeyvine milkweed, Giant ragweed, and Cocklebur
in 1992. Soybean cyst nematode and very small amounts of Sudden
death syndrome were the only soybean diseases noted; insect pests
included Bean leaf beetle, Grasshopper, and Green cloverworm.
Weeds present were Johnsongrass, Cocklebur, Black nightshade, Giant
ragweed, and Velvetleaf. Only two tobacco diseases of concern
were reported for IPM fields: Tobacco blue mold and Virus complex
(including Tobacco etch virus and Tobacco ring spot virus).
Insects of particular concern in tobacco included Tobacco hornworm,
Aphids, Tobacco budworm, Flea beetle, and Wireworm. Weeds of
particular concern were reported as being in relatively few fields: Morningglory,
Lambsquarters, Pigweeds, Crabgrass, and Yellow nutsedge. Several
wheat diseases of concern were also quite widespread in 1992, including
Glume blotch and Septoria leaf blotch. Other diseases
that occurred in relatively few fields included Powdery mildew
and Leaf rust. Insects of particular concern in wheat that were
reported included Aphids, Armyworm, and Cereal leaf beetle.
All four weed species of concern in wheat were reported for 1992: Wild
garlic, Chickweed, Mustards, and Henbit.
Original document: 5 December 1996
Last updated: 5 December 1996
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