Kentucky Integrated Pest Management
Annual Summary 1991
Eight counties participated in formal county-based Integrated Pest Management
(IPM) programs in 1991. These programs included 299 fields with a total
of 10473 acres. Independent scouting consultants, informal and trial county
programs, and farmer-scouts encompassed an additional 114,000 acres. All
together, more than 124,000 acres were involved in some phase of integrated
pest management during 1991.
Nearly three-fourths of the acreage enrolled in county-based IPM programs
was planted in corn. Soybeans accounted for 19% of the acreage and alfalfa
8%. Wheat (1%) and grain sorghum (0.4%) were very small components of
the total picture.
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 Black chaff, Glume blotch, Head scab, Barley yellow dwarf
virus, Powdery mildew,and Septoria nodorum leaf blotch.
The only other common disease was Leaf spot in alfalfa. Fields
were most severely affected by Head scab and S. nodorum
leaf blotch (100% of affected wheat fields over reporting value),
Glume blotch, Barley yellow dwarf virus, and Leaf spot (up
to 50% of affected fields over reporting value).
Alfalfa weevil and Potato leafhopper were extremely widespread
in alfalfa. Grasshoppers were common in both alfalfa and soybeans.
Aphids were also common in alfalfa. European corn borer
was the only common insect pest in corn. Of these, Alfalfa weevil and
Grasshoppers reported a significant number of fields over the reporting
values for these pests. European corn borer and Potato leafhopper also
exceeded their reporting values in 10-20% of the fields planted in their
Nineteen weeds were commonly reported in alfalfa, corn, soybeans, and/or
wheat, including Dock, Honeyvine milkweed,and Yellow nutsedge,
to name a few.
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 1991 included Leaf spots, Anthracnose, Alfalfa weevil,
Potato leafhopper, Chickweed, Dock, Crabgrass, Mustards, and Thistle.
Very small amounts of Stewart's wilt and Anthracnose were
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, and Cocklebur
in 1991. Soybean cyst nematode was the only soybean disease noted;
insect pests included Bean leaf beetle, Grasshopper, and Green
cloverworm. Weeds present were Johnsongrass, Cocklebur, Black nightshade,and
Velvetleaf. Several wheat diseases of concern were also quite widespread
in 1991, including Powdery mildew, Septoria leaf blotch,and
Glume blotch. No insects of particular concern in wheat were reported.
Three weed species of concern in wheat were reported for 1991: Wild
garlic, Chickweed, and Henbit. Only one field of grain sorghum
was surveyed in 1991. Scouts found no diseases of particular concern,
but did find Fall armyworm in high numbers and Aphids. Cocklebur
was the only weed of concern found in this field in 1991.
Original document: 5 December 1996
Last updated: 5 December 1996
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