Plant Diseases

Virginia Master Naturalist, Basic Training Course, Botany

Wed, 27 Mar 2013 14:20:00 -0400

Pest Management Guide: Field Crops, 2013

Mon, 18 Feb 2013 11:24:00 -0500

Pest Management Guide: Horticultural and Forest Crops, 2013

Thu, 14 Feb 2013 15:44:00 -0500

Troubleshooting The Soybean Crop

Fri, 16 Nov 2012 09:11:00 -0500

Rose Rosette Disease

Mon, 17 Sep 2012 01:00:00 -0400

Rose rosette disease (RRD), a disease believed to be caused by the recently identified Rose rosette virus, has been spreading through much of the wild rose population of the Midwestern, Southern, and Eastern United States for years.

Sorghum (Sorghum vulgare, L.) Insects Corn earworm [Helicoverpa zea (Boddie)]

Fri, 31 Aug 2012 16:35:00 -0400

The purpose of this publication is to provide performance data of the many soybean varieties offered for sale in Virginia. These data should be of benefit to producers and agribusinesses in making selections of varieties for their use. It is realized that not all varieties that are offered for sale in Virginia are included in these tests. There is no implication that varieties not included are inferior in any way, but only that they have not been tested.

Sorghum (Sorghum vulgare, L.) Diseases Head mold

Tue, 21 Aug 2012 16:35:00 -0400

Applied Research on Field Crop Disease Control 2011

Wed, 01 Feb 2012 10:57:28 -0500

Impact of Cotton Monoculture, Variety Selection, and Chemical Inputs on Disease Control, 2011

Fri, 27 Jan 2012 10:45:45 -0500

Late Blight of Tomato and Potato

Fri, 20 Jan 2012 09:19:32 -0500

Plant Disease Diagnostic Form

Mon, 09 Jan 2012 14:03:05 -0500

Boxwood Blight: A New Disease of Boxwood Found in the Eastern U.S.

Thu, 05 Jan 2012 10:03:52 -0500

Managing Fusarium Head Blight in Virginia Small Grains

Fri, 04 Mar 2011 14:06:03 -0500

Fusarium head blight (FHB), or scab, continues to impact small grain crops grown in Virginia. Caused primarily by the fungus Fusarium graminearum (also known as Gibberella zeae), this disease can negatively impact yield and grain quality. Grain may also contain toxins (mycotoxins) produced by the fungus and reduce the price received for grain at local mills and elevators. Corn and small grain residues remaining in the field prior to small grain planting are known to provide a place for the fungus
to overwinter and proliferate during favorable environmental conditions.

Soybean Rust Incidence and the Response of Soybeans to Fungicides in 2009

Tue, 21 Dec 2010 14:14:43 -0500

Bean Pod Mottle Virus in Virginia Soybeans

Thu, 09 Sep 2010 11:07:18 -0400

Common Diseases of Soybean in the Mid-Atlantic Region

Wed, 17 Feb 2010 15:26:39 -0500

Common diseases of soybean are caused by viruses, bacteria, fungi and nematodes. Some diseases are spread by insect vectors and nematodes while others are spread by wind, splashing rain, or movement in soil. The best way to determine if disease control would be profitable is to first identify the diseases that are capable of causing conomic yield losses. Symptoms of disease include plant damage caused by a pathogen and the reaction of plants to infection. Signs are the visible evidence of the pathogen. Some diseases have characteristic symptoms and signs that are identifiable in the field.

Bacterial Leaf Scorch of Landscape Trees

Mon, 11 Jan 2010 15:04:51 -0500

Winter Injury and Cool Temperatures Create Ideal Conditions for Botrytis in Strawberries*

Tue, 18 Aug 2009 11:48:18 -0400

Winter injury has left many dead leaves that will serve as a major source of Botrytis spores in the early spring season. Likewise, a number of plantings recently experienced freeze injury to emerged blooms. These dead flowers can become infected with Botrytis; the pathogen can grow down the peduncle and into the upper crown tissue to cause a Botrytis crown rot.

Use of In-furrow Fungicide Treatments and Seedpiece Dusts for Disease Control in White Potato

Tue, 18 Aug 2009 11:12:31 -0400

On the Eastern Shore of Virginia, potato growers plant potatoes in early spring for summer harvest. Fungicide dusts have been typically used to protect the potato seedpiece from infection when planted in cool, wet soil in the early spring.

Downy Mildew in Cucurbits: Occurence of QOI Resistance in the USA and Impact on Managing Disease

Wed, 12 Aug 2009 11:08:17 -0400

Strains of the cucurbit downy mildew fungus resistant to QoI (also known as strobilurin) fungicides were detected in GA and NC in fall 2004 and in FL in spring 2005. The genetic mutation detected is the same as that in QoI-resistant cucurbit powdery mildew fungal strains.

Successful No-Tillage Corn Production

Wed, 29 Jul 2009 12:10:08 -0400

Strawberry Anthracnose Ripe Fruit Rot and Management Recommendations

Thu, 23 Jul 2009 10:34:12 -0400

Anthracnose symptoms on ripe strawberry fruit include typical sunken and round lesions with an orange discoloration within the lesion and brown spots on green fruit.

Actigard May Reduce Disease in Strawberry

Tue, 14 Jul 2009 15:49:25 -0400

One of the biggest problems facing strawberry production in Virginia is disease management.

Botryosphaeria Canker and Dieback of Trees and Shrubs in the Landscape

Thu, 18 Jun 2009 09:16:23 -0400

Symptoms of Botryosphaeria cankers and dieback are most commonly seen as wilting or dieback of a branch or branches on a tree or shrub that, in other respects, appears healthy

Applied Research on Field Crop Disease Control 2008

Wed, 13 May 2009 00:00:00 -0400

Cool temperatures and rainfall delayed planting of cotton and peanut until after 20 April in Virginia. Thereafter, rainfall was widely scattered and soil temperatures averaged above 60 ºF which allowed planting to proceed in a timely manner. Most crops showed good emergence after planting throughout Eastern Virginia, except for some stand losses in early plantings of corn.

Fusarium Wilt of Mimosa (Albizia julibrissin)