Kentucky Integrated Pest Management
Annual Summary 1987

ABSTRACT

Approximately 72% of the acreage enrolled in county-based IPM programs was planted in corn. Soybeans accounted for 21% of the acreage followed by wheat with 5%. Alfalfa (2%) and grain sorghum (0.4%) were relatively 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. There were two diseases that were "common" in 1987 using this definition: Leaf spots in alfalfa and Glume blotch in wheat. Approximately half of the fields affected by each of these diseases were over the reporting value for the particular disease.

Alfalfa weevil and Potato leafhopper were widespread in alfalfa. All fields reporting these pests were over their respective reporting values. European corn borer was common in corn; approximately 20% of these were over the reporting value. There were only two fields of grain sorghum in the 1987 program, thus if a pest species was found, it would be classified as "common" by our definition. Aphids, European corn borer, Green stinkbug, and Sorghum midge were all reported; no fields were over the reporting values for these pests.

A number of weeds were reported as common in two of the crops surveyed (grain sorghum and soybeans). All the weed pests of soybeans were over their reporting values in at least some portion of the fields affected; neither of the grain sorghum fields were over reporting values for any weeds reported. Weeds included Cocklebur, Giant ragweed, Horsenettle, Morningglory, and Trumpetcreeper in grain sorghum, and Honeyvine milkweed, Johnsongrass, Morningglory, and Prickly sida in soybeans.

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 1987 included Leaf spots, Anthracnose, Alfalfa weevil, and Potato leafhopper. There were no weeds of concern reported for alfalfa. Several diseases of particular concern were found in corn in 1987, including Stalk rots, Anthracnose, Northern leaf blight, and Stewart's wilt. A number of insect pests were also reported, including 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 1987.

There were no diseases of particular concern reported from the two grain sorghum fields in the 1987 IPM program. Two insect pests of particular concern, Sorghum Midge and Aphids, were reported. Cocklebur was the only weed of concern reported for grain sorghum. Phytophthora root rot was the only soybean disease noted; insect pests included Bean leaf beetle, Grasshopper, Green cloverworm, and Soybean podworm (aka Corn earworm). Weeds present that were of concern were Johnsongrass, Cocklebur, Black nightshade, Velvetleaf, and Giant ragweed. Septoria leaf blotch and Glume blotch were diseases of concern reported in wheat. The only insect of particular concern in wheat reported was Cereal leaf beetle. Weed species of concern in wheat reported for 1987 included: Wild garlic, Chickweed, and Mustards.

	Original document: 5 December 1996 Last updated: 5 December 1996