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Nematode Assay Program
Soils for nematode analysis should not be taken if the ground is frozen. During the winter months, if the ground is not frozen, samples should be taken at a depth of 12 inches, as nematodes go deeper...
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Downy Mildew of Impatiens
Downy Mildew on Underside of Leaf Downy mildew of impatiens is a serious new disease in the United States, caused by the fungus-like Oomycete, Plasmopara obducens. Originally found in Europe, impatiens...
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Winter Temperature Index For Predicting Stewart’s Wilt in Delaware Sweet...
Stewart’s wilt – image courtesy of J. Pataky, University of Illinois Winter Temperature Index For Predicting Stewarts Wilt 2013 Temperature indexes averaging 106 to 113 combined degrees for December,...
View Article2013 DE Cooperative Extension Short Course – Christmas Tree Production
April 23, 2013 4 – 6 p.m. Delaware Department of Agriculture, 2320 S DuPont Hwy, Dover, DE (Cost $10), Credits: 2 Pest, 1 CNP Learn to identify and control important insect pests and plant diseases...
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68th Meeting of the NJDelMarVaPa Plant Pathologists
Attendees at the 2013 NJDelMarVaPa Plant Pathology Meeting at UD in March The 68th annual meeting of the NJDelMarVaPa Extension Plant Pathologists was held in at the University of Delaware in Newark,...
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Rose Rosette Disease Summit in Newark, DE April 15-16
Steve Hutton – President and CEO of Star Roses and Plants/Conard-PyleDr. Michael Dobres – Managing Director of Nova Flora LLCKathleen Case, Facilitator, Cindy Zook AssociatesDr.Thomas Bewick – USDA...
View ArticleExtension Plant Pathologist Nathan Kleczewski Joins UD
The University of Delaware welcomed Dr. Nathan Kleczewski on May 1, 2013. Nathan will be serving as Extension Specialist in Plant Pathology.
View ArticlePresentations from the 2013 Christmas Tree Workshop are Posted
Presentations from our 2013 Delaware Christmas Tree Production Workshop have been posted on the website under Plant Diseases and Christmas Trees, at...
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Ash Rust
Severe symptoms of ash rust affecting leaves and twigs, R. Mulrooney image Rust has been severe this spring on ash trees, characterized by leaf spot and orange sporulation of the rust fungus on leaves...
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Storm Damage
Flooding SATURATED SOIL can lead to problems with roots of trees and shrubs, and ultimately contribute to death or uprooting of trees. When soil becomes saturated through over-watering or heavy rains,...
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Boxwood Blight Confirmed in Delaware
Boxwood blight caused by the fungus Cylindrocladium pseudonaviculatum was confirmed in a retail nursery in Delaware on June 19, 2013. Leaf spot on boxwood infected with the boxwood blight pathogen...
View ArticlePhytophthora Root Rot in Flooded Soils
Phytophthora root rot, a soil borne disease caused by a fungus-like organism, is a widespread problem which can affect many of our woody and herbaceous landscape plants. Azaleas, hollies, and...
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Fungus-like Things That Grow in Mulch and on Lawns
FUNGI AND SLIME MOLDS grow in mulch composed of organic debris and wood chips. Fungi and fungus-like organisms such as slime molds are decomposers, and they do it very well to the benefit of our...
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Leaf Scorch on Maples
Dark areas on maple leaves following excessive water and heat LEAF SCORCH SYMPTOMS ON MAPLE AND OTHER HARDWOODS have been showing up quite dramatically and rapidly in the landscape. Several samples...
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Management of Boxwood Blight in the Landscape
MANAGEMENT OF BOXWOOD BLIGHT (caused by the fungal pathogen Cylindrocladium pseudonaviculatum) will be important in our area over the next few years, after detections in MD, DE, and PA. Be cautious...
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Mulberry Weed: a New Invasive Plant in Delaware
Mulberry Weed (Fatoua villosa) Description and Geographic Distribution Mulberry Weed or hairy crabweed (Fatoua villosa) (Thunberg) Nakai is an invasive exotic Asian species from the Mulberry family...
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O’ Christmas Tree
Healthy Douglas Fir In December, many people are shopping for a perfect cut tree or live tree to decorate their homes. There have been recent reports in 2013 regarding root rot in fir, causing problems...
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Winter Injury and Frost Cracking
Frost Cracking Maple. Image courtesy of B. Johnson The Clinic recently received an inquiry via our Ask an Expert feature, about the bark splitting on a red maple tree. A key piece of information was...
View ArticleWatch for Tobacco Mosaic Virus in Petunia
This message is an alert for growers and retail bedding plant sellers that some petunia seedlings have been detected in the U. S. that are infected with tobacco mosaic virus (TMV). TMV is very common...
View ArticleNew! UD Plant Diagnostic Clinic Report and other Reports Posted
Please see the following link for the 2013 Plant Pathology Clinic, Survey, and Research Reports Bulletin:...
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