University of Maryland Extension

Horticulture and Disease Topics

Horticulture provides healthy foods, aesthetic landscapes, improved air, water and green space, and Maryland’s livability. These goals are accomplished by: 1) conducting research in managed horticultural systems 2) collaborating with industry leaders, agencies, and stakeholders to improve production efficiencies, environments, livelihoods and human well-being, and 3) delivering statewide education programs through improved communication, research, and teaching techniques.

Vegetable production is changing rapidly worldwide. Major factors driving change are globalization, environmental protection, and urbanization. Globalization introduces new models of business and competition requiring global perspectives and innovation to maintain viable markets. Environmental issues demand research and implementation of production practices to achieve healthy neighborhoods and farm systems. Consumers are increasing their demand for a safe, secure, affordable local food system. Maryland’s vegetable growers have considerable opportunities to adjust rather than remain threatened with globalization and urbanization.


Bacterial Spot, Thrips and Mites; Problem Pests Now in Tomatoes - 9/2020

Broad Mites Found in Maryland Caneberries - 9/2020

Southern Blight Found Throughout Maryland this Season - 9/2020

Good Time to Check for Root Knot Nematode in Vegetables - 9/2020

Plectosporium Blight Common in Pumpkin Fields this Year - 9/2020

Celery Leaf Curl Found in Several Fields in the Mid-Atlantic – 7/2020

Extreme Weather Events Could Compromise One of our Best Disease Management Tools in Vegetables – 7/2020

Gummy Stem Blight in Cantaloupe – 7/2020

Odd Cold Damage in Potato Field – 7/2020

Ozone Damage to Cucurbit and Tomato Plants – 7/2020

Problems with Pollination in High Tunnel Tomatoes – 7/2020

Southern Bacterial Wilt of Tomato Found – 7/2020

Tomato Spotted Wilt Virus in Tomatoes – 7/2020

White Rot of Onion and Garlic – 7/20200

Cold Damage to High Tunnel and Greenhouse Vegetables - 5/2020

Cold Damage to Strawberry Flowers - 5/2020

Does it Pay to Graft Tomatoes for Increased Yields - 12/2019

Dry Plugs /causing Problems in Some Strawberry Fields - 12/2019

Old News but it Pays to Clean Up Your High Tunnel in the Off-Season - 9/2019

Maintain Pumpkin Foliage - 9/2019

Potassium and Other Factors Needed for High Quality Tomatoes - 8/2019

Oh Hail Yes - 8/2019

Oregon Dept of Ag Stops the Sale of Some Neem Products - 8/2019

Sulfur Deficiency in Corn and Watermelon - 8/2019

Santitation Important in Transplant Production Houses - 6/2019

Brusing on Strawberry Leaves - 6/2019

Tomato Problems - 9/2018

Sulfur Deficiency in Sweet Corn - 9/2018

Expect Poor Fruit Set in Tomatoes this Week - 9/2018

Manganese Toxicity in Cantaloupe - 9/2018

Be Alert for Late Blight Showing Up on Tomatoes - 7/2018

Black Dot Root Rot - 7/2018 

Pollination Problems in High Tunnels -7/2018

Sunscald on Vegetable Leaves - 7/2018

Tomato Pith Necrosi - 7/2018

Ethylene Problems in Vegetable High Tunnels - 4/2018

Frequent Rains = Lots of Vegetable Disease Problems - 4/2018

High Soluble Salts in Some High Tunnels - 4/2018

Rain Check in Tomatoes - 4/2018

Virus Problems in Garlic Found Early This Year - 4/2018

Tomato Pollination and How to Increase it in High Tunnels (Presentation) - 6/2017

Biostimulent Work: Using Stimplex for Vegetable Disease Management  - 4/2017

Biostimulent Work: Effect of Stimplex on Late Season Tomatoes Grown at Reduced N - 4/2017

Biostimulent Work: Commercial Extracts of the Brown Seaweed Ascophyllum nodosum and Silicon Reduce Plant Death Due to Fusarium solani and Increase Yields of Cucurbits - 4/2017

Biostimulent Work: Using Stimplex and CaSi in Tomato for Increased Yields and Quality - 4/2017

Biostimulent Work: Evaluate Stimplex and Acadia LSC on Yield of Watermelon - 4/2017

Biostimulent Work: Using Stimplex and Acadia LSC in Watermelon Production to Reduce Nitrogen Usage - 4/2017

Some of our watermelon fields may be low in sulfur - 10/2016

Why so little yellow shoulders in tomatoes this year? - 10/2016

Other Fruit Problems in 2016 Tomato Crop - 10/2016

Catfacing Problems in Tomatoes - 7/2016

Tomato Pollination - 3/2016

Vegetable Fertility - 3/2016

Sunscald Very Prevalent in Peppers This Year - 8/2015

Tomato Ripening - 8/2015

Helping Fruit Set in Tomatoes - 8/2015

Blossom End Rot in Tomatoes - 8/2015

Cantaloupe (Muskmelon) in Maryland

Grafting Heirloom Tomatoes for Increased Yields and Quality - 3/2014

Tomato and Blossom End Rot - 7/2014

Tomato Plastic Mulch and Shade Study 2012

Organic Weed Control in No-Till Vegetable Systems - 3/2014

Nutrient Problems and Their Management in Tomatoes - 12/2013

Silicon Use in Pumpkins - 12/2013

Tomato Ripening Problems and Potassium - 3/2013

Reducing N Applications - 3/2013

Midwest Vegetable Trials - 3/2013

Air Pollution and its Effect on Vegetables - 3/2013

Petiole Sap-Testing - 3/2013

Vegetable Variety Trials - 3/2013

Tomato Disorders - 3/2013

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