Monthly Archives: July 2018

Fall Webworm 2.0

Colonies of fall webworm caterpillars work together to encase terminal foliage of over 100 species of forest trees, shade trees, and shrubs in silk (Figure 1). Then, they feed together in this shelter for 4 to 5 weeks, expanding it

Posted in Landscape Trees & Shrubs

Oak sawflies – One Cause of Leaf Browning

Oak sawflies are common on red and white oaks.  A thin layer of upper leaf surface with a network of veins is left behind as a result of their surface feeding; these areas quickly turn brown, giving the appearance of

Posted in Landscape Trees & Shrubs

Cicada Killer Wasps

Cicada killer wasps are busy during July and August, capturing prey and bringing it to individual burrows to feed their developing larvae. Although intimidating, these harmless insects can be destructive along walkways and on golf courses where their excavations bring

Posted in Lawn & Turf

Paper Wasps, Hornets, and Yellowjackets

Paper wasps, hornets, and yellowjackets are social insects that build nests of chewed plant fibers and salivary secretions.  The nests include cells in which wasp larvae are reared on a diet consisting of caterpillars and other insects captured as the

Posted in Human Pests

Notify Local Beekeepers before Applying Some Insecticides to Plants in Flower

Some insecticide labels require applicators to notify beekeepers 48 hours before making applications to flowering plants. But many applicators do not even know if there are bee colonies near their fields or where those colonies are located. This notification is

Posted in Pesticide Topics

Frogeye Leaf Spot & Black Rot of Apple (PPFS-FR-T-03)

Black rot and frogeye leaf spot are common names of an apple disease that occurs in three phases: (1) leaf infections result in frogeye leaf spot, while (2) fruit rot and (3) branch infections are referred to as black rot.

Posted in Featured Pubs & Videos

Plant Disease Diagnostic Lab Highlights

The following plant disease highlights from the University of Kentucky Plant Disease Diagnostic Laboratories represent recent sample submissions from field crops, fruit, vegetables, and ornamentals. Diagnostic samples of agronomic crops have included Lepto leaf spot, summer black stem, and Phytophthora

Posted in Plant Disease Diagnostic Lab

2018 Insect Trap Counts

Trap counts for major insect pests are provided by the Kentucky IPM Program. Traps are located at the UK Research and Education Center in western Kentucky and the UK Spindletop Farm in Lexington.  Below are trap counts for the current

Posted in Insect Trap Counts

Variegated (Not Western Bean) Cutworm Identified

Two weeks ago, I reported in KPN about a suspected western bean cutworm egg mass that was collected by a field scout in Owensboro. This large egg mass was located on the upper leaf surface of the upper leaf of corn.

Posted in Grains

Cucurbit Downy Mildew Fungicide Sensitivity Research and Extension Project

Cucurbit downy mildew is the most economically important disease of cucurbits in Kentucky. All cucurbits, such as cucumber, cantaloupe, summer and winter squashes, pumpkin, and watermelon are susceptible to this water mold (fungal-like organism/oomycete) pathogen (Figure 1). Since cucurbit downy

Posted in Vegetables

Vegetable Diseases to Scout for: Cucurbit Powdery Mildew

Early reports of powdery mildew on cucurbit crops are beginning to come in from Kentucky locations this week, so systemic fungicides should be incorporated into spray programs now for most effective disease management. Powdery mildew is a common disease of

Posted in Vegetables

Boxwood Blight Threatens Kentucky Shrubs

Boxwood blight has been detected in Kentucky again this year. The disease can be devastating to American boxwood cultivars, which are common in the Kentucky landscape. Complete defoliation can occur within a week and plants can die within a single

Posted in Landscape Trees & Shrubs

Black Locust Brown?

In some areas of the state, black locust trees have taken on a brown color (Figure 1). This is due to activity of locust leafminer, which results in trees that appear scorched. The adults feed on lower leaf surfaces while

Posted in Forest Trees, Landscape Trees & Shrubs

Kissing Bugs

A recent rash of calls and pictures of kissing bugs from various counties indicate that this insect is active. The eastern conenose bug is a species of kissing bug that lives throughout Kentucky. These insects can be found in or

Posted in Human Pests

Creatures after the Rains

Frequent rains favor several arthropods that do well under humid or wet conditions. These include springtails, pillbugs, gnats, and millipedes. Springtails Springtails (small, wingless insects that hop, Figure 1) are among the most numerous soil arthropods. There are several species

Posted in Household Pests