Kentucky Integrated Pest Management
Annual Summary 1990
Five counties participated in formal Integrated Pest Management (IPM)
programs in 1990: Webster, Butler, Shelby, and Union Counties in Kentucky,
and Gallatin County in Il- linois. In all, 52 farms were enrolled in formal
county IPM programs, encompassing 437 fields (13930 acres). Data were
obtained on the incidence of insect, weed, and disease pests in three
counties (7,870 acres) and additional data on insect pests was obtained
from the remaining two counties. Scouts working for Kentucky Seed Improvement
Association, Inc. surveyed an additional 4,732 acres in 10 counties. Fulton
and Todd Counties used IPM training and materials, but did not have formal
IPM programs. A total of 93,377 acres in crops and 929.330 bushels of
stored grain were scouted by farmers themselves, usually after receiving
training through the IPM scout schools held at various times during the
growing season. Thus, 105,656 acres of Kentucky crops were involved in
some type of integrated pest management in 1990 (Johnson, 1990 ms).
The majority of acres in the 1990 county-based IPM programs were planted
in corn (62.9%), followed by soybeans (14.7%), wheat (12.6%), and alfalfa
(8.6%). Grain sorghum (1.1%) and tobacco (0.04%) were very small components
of the crops that were scouted in these programs.
Pests were identified as "most common" if they occurred in 50% or more
of the fields planted in a particular crop. There were only two diseases
that were common during 1990: Powdery mildew and Leaf rust,
both in wheat. Approximately one-half of the fields reporting Powdery
mildew problems were over the reporting value for this disease. About
one-third of the fields with Leaf rust exceeded its reporting value.
Alfalfa weevil was reported in over 90% of alfalfa fields, all
of which were over the reporting value. Fall armyworm and Sorghum
midge were common in the grain sorghum fields scouted.
A number of weeds were reported in over 50% of the soybean or grain
sorghum fields scouted. These included Morningglory and Cocklebur
in soybeans, and Trumpet creeper, Giant foxtail, Morningglory, Horsenettle,
and Honeyvine milkweed in grain sorghum.
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 1990 included Sclerotinia crown and stem rot and
Leaf spots. Alfalfa weevil and Potato leafhopper were
reported; Potato leafhopper was found in only about 28% of the alfalfa
fields scouted, with about25% of those over the reporting value. Three
weeds of particular concern in alfalfa were reported: Dock, Mustards,
and Thistle, each occurring in less than one-third of the fields
scouted. A very small amount of Stewart's wilt was reported from
corn fields in the program. This was the only disease of concern in corn
reported. All but one of the insects of particular concern in corn were
reported, although percentages stayed around 30% of all corn fields surveyed.
These included European corn borer, Black cutworm, Armyworm, Fall armyworm,
and Southern and Western corn rootworm beetles. Honeyvine milkweed,
Cocklebur, and Johnsongrass were the only weeds of concern
reported. Each was reported in less than 20% of the fields surveyed. No
soybean diseases of particular concern were reported, however, we do not
have data on Soybean cyst nematode in the surveyed fields. Insects
of particular concern reported for 1990 were Green cloverworm, Grasshoppers,
and Bean leaf beetle. Cocklebur was the most widespread
of weeds of concern in soybeans, followed by Velvetleaf, Johnsongrass,
and Giant ragweed. Powdery mildew, Leaf rust, and Septoria
leaf blotch were quite widespread and severe in wheat fields in 1990.
Aphids and Cereal leaf beetle were the only insects of concern
to be reported in wheat and these were generally in low numbers. Two weeds
were reported: Wild garlic and Henbit, although these were
found in less than 10% of the wheat fields surveyed. No grain sorghum
diseases were reported in 1990. Fall armyworm, Aphids, and Sorghum
midge were reported from the three grain sorghum fields surveyed.
No weeds of particular concern were reported from these fields. One five-acre
tobacco field was surveyed: Angular leaf spot was reported at values
exceeding its reporting value, Flea beetle was also found. Three
weeds of concern, Redroot pigweed, Yellow nutsedge, and Ragweed,
were reported as well.
Original document: 5 December 1996
Last updated: 5 December 1996
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