Blog Archives

Hemp Greenhouse Sanitation: Cleaning Up Today May Keep Disease Away

Diseases are a major concern for greenhouse hemp growers, and they can be a factor that limits the profitable production of plants. The warm, humid greenhouse environment provides optimal conditions for reproduction of many pathogens. A good sanitation program can

Posted in Hemp

Powdery Mildew of Hemp

Powdery mildew can affect numerous plants, including fruit, vegetable, and agronomic crops, as well as woody and herbaceous ornamentals. Kentucky hemp is also susceptible to this disease. Plants infected early in the season can be seriously damaged, while those affected

Posted in Hemp

Sanitation Recommendations for Small-Scale Field Hemp Plantings

Hemp is often considered a disease-free plant. However, research is being done to determine whether certain pathogens can increase to problematic levels in the field. Should disease become a significant problem in field-planted hemp, the result can be premature leaf

Posted in Hemp

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

Septoria Leaf Spot of Hemp

Hemp (Cannabis sativa) is grown both outdoors and in greenhouses.  Outdoor-grown hemp is susceptible to infection by leaf spot fungi that affect other crops and nearby plants, especially during periods of extensive rain or high humidity.  There are three primary

Posted in Hemp

New Grower Resource: A Grower’s Guide to Kentucky Hemp Production Video Series

The Grower’s Guide to Kentucky Hemp Production webinar was conducted on May 5, 2020. Sessions from this webinar were recorded and are now available online. These videos provide information for growers of all experience levels. This series includes presentations from

Posted in Hemp

The Science of Hemp Meeting Proceedings

Hemp is an emerging crop within the U.S. and around the world. Previously, this crop was classified as a Scheduled 1 controlled substance within the U.S., which limited its production. However, The Agricultural Act of 2014 (Farm Bill) allowed for

Posted in Hemp

Last Year’s Hemp Diseases Equal This Year’s Disease Risk

Disease presence last year can indicate a risk for the same disease this year. Many pathogens overwinter on infected plant material or as pathogen survival structures. Poor sanitation practices can lead to an increased risk of these diseases in the

Posted in Hemp

2020: List of Products for the Management of Insects and Mites in Commercial Hemp

For the 2020 growing season, the Kentucky Department of Agriculture (KDA) has a list of pesticides registered for commercial hemp in the following link: Pesticide Products Registered for Industrial Hemp in Kentucky. This link should be checked periodically as new

Posted in Hemp

Two Additional Insecticides Are Registered under Section 24(c) to Manage Insect Pests on Hemp in Kentucky

Two additional products recently received Environmental Protection Agency (EPA) approval under State Local Need Section 24(c) registrations for use against insect pests on hemp. These are Gemstar, a naturally occurring nucleopolyhedrovirus (HzSNPV), and Agree WG, a biological insecticide effective against

Posted in Hemp, Pesticide Topics

EPA Approves Use of 10 New Pesticide Products for Hemp

Last Month, the Environmental Protection Agency (EPA) announced that it has approved 10 pesticides for use on Hemp for the 2020 growing season. Nine of these products are biopesticides and one is a conventional pesticide. This expands the tools producers

Posted in Hemp, Pesticide Topics

Tachinid Flies Might Have Been Actively Working this Season in Kentucky

This past July I observed tachinid flies around conglomerations of June bugs and Japanese beetles while tallying insects in industrial hemp fields (Figure 1). Yaziri Gonzalez (graduate student in Entomology) collected stink bugs in soybean fields in central and western

Posted in Grains, Hemp

Heligen® is Registered under Section 24(c) to Manage Corn Earworm in Industrial Hemp in Kentucky

A naturally occurring baculovirus (Helicoverpa zea nucleopolyhedrovirus) with the commercial name of Heligen® was registered in Kentucky under FIFRA Section 24(c) (Heligen 24c KY190041 SLN Acknowledgement Letter_20190925). This is a highly specific virus used to control corn earworm (Helicoverpa zea)

Posted in Hemp, Pesticide Topics

Corn Earworm Outbreaks in Industrial Hemp in Kentucky: September – 2019

Helicoverpa zea (formerly Heliothis zea) is an insect that affects many crops and is known with different common names, depending on the crop it affects: cotton bollworm, soybean podworm, tomato fruitworm, or corn earworm. The larva of this noctuid moth

Posted in Hemp

Hemp Russet Mite Detected in Several Areas across Kentucky

Problem During the last 2 weeks of July, several hemp samples were received and evaluated by specialists at the University of Kentucky (Lexington and Princeton).  Hemp russet mites (Aculops cannabicola, Acari: Eriophyidae) (Figure 1) were observed on nearly all of

Posted in Hemp