Monthly Archives: July 2020

Plant Disease Diagnostic Lab Operations Update

The University of Kentucky Extension Plant Pathology Team would like to provide the following updated guidelines for managing Plant Disease Diagnostic Lab operations during COVID-19 and the re-opening phases in Kentucky. Lexington PDDL Laboratory Until further notice, operations of the

Posted in Announcements, Plant Disease Diagnostic Lab

Beware of Unsolicited Gifts (Seeds)!

People in several states, including several residents in Kentucky, have received unsolicited small packages of foreign seeds in the mail from China. Potentially these can pose a threat to Kentucky agriculture and the environment through the introduction of invasive plants

Posted in Misc. Topics

New Disease Severity and Insect Defoliation Training Tool

Crop scouts and field researchers now have a new tool at their disposal to help correctly estimate disease severity and insect defoliation in field crops. The new online tool has been developed by the Crop Protection Network and can be

Posted in Grains

Threecornered Alfalfa Hopper Found Cutting Soybeans

Problem In response to the Agriculture and Natural Resources Agent in Butler County (Gregory K Drake), we visited a soybean field that had plants cut off or lodged at 1 to 3 inches above ground (Figure 1). This field, which

Posted in Grains

Southern Blight of Hemp

In 2018, there were significant increases in confirmed cases of southern blight in hemp.  The fungal disease affects a wide range of plant species, as well as hemp. When stems and roots become infected, plants can wilt, decline, and/or die,

Posted in Hemp

Cucurbit Downy Mildew Creeping Closer to Kentucky

Cucurbit downy mildew was confirmed on winter squash in central Tennessee on July 24, so all Kentucky cucurbit growers should be on alert for this disease in their crops. Symptoms are shown in Figures 1 and 2, on cucumber and

Posted in Vegetables

How Dry Seasons Affect Woody Plants

Water is an essential component to plant mass and is vital to growth, carbohydrate production, and nutrient transport. During periods of below-average rainfall or when rain distribution is uneven, plant health may decline (Figure 1). Drought conditions or inadequate water

Posted in Landscape Trees & Shrubs

Grape Powdery Mildew (video)

Dr. Nicole Gauthier, Plant Pathology Extension Specialist, has created a short video (3:04 minutes) focusing on grape powdery mildew.  This video provides information on disease appearance and prevention. Grape Crown Gall is available online. For additional publications on small fruit

Posted in Featured Pubs & Videos

2020 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

Phytophthora Root and Stem Rot Being Observed in Some Soybean Fields

In parts of the state where wet weather has continued through the season so far, one of the diseases being observed is Phytophthora root and stem rot, which is caused by the oomycete (aka water mold) pathogen Phytophthora sojae. This

Posted in Grains

Southern Rust Confirmed in Kentucky

Southern rust of corn, caused by the fungus Puccinia polysora, was confirmed in Caldwell and Daviess counties in Kentucky on July 20, 2020. We typically confirm southern rust in Kentucky in mid-July, so the timing of these findings is on

Posted in Grains

Stress and Decline in Woody Plants

Woody trees and shrubs may exhibit decline resulting from the stresses that can occur during their lives. Stress may be the result of improper plant or site selection, incorrect planting or maintenance practices, or poor soil conditions. Injury from equipment,

Posted in Landscape Trees & Shrubs

Boxwood Blight

Boxwood blight 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 growing season. Use of tolerant cultivars, cultural practices, and fungicides

Posted in Landscape Trees & Shrubs

Asian Longhorned Tick: A New Tick in Town

Ticks are always a concern for those of us who like to go outside to hike or hunt and for those of us who work in outdoor settings. Ticks are annoying blood thieves and they are also potent disease vectors,

Posted in Human Pests, Livestock Pests

Black Spot of Rose (PPFS-OR-W-10)

Black spot is the most common and serious disease of roses in Kentucky, affecting susceptible cultivars in greenhouse production and outdoor plantings. This one page fact sheet covers symptoms, cause, disease development, and management options. Black Spot of Rose (PPFS-OR-W-10)

Posted in Featured Pubs & Videos