University of Maryland Extension

Integrated Pest Management

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Grasshoppers: Life Cycle and Control

Life Cycle In early September the weather has changed to hot and dry, at least for this week. Many weeds are drying up and grasshoppers are moving into container grown perennials and annuals. Some growers are reporting feeding damage on their plants in garden centers, nurseries and greenhouse...

Downy Mildew on Basil and Coleus

Downy Mildew on Basil Downy mildew has become an emerging disease of basil. The first US detection of this disease was in Florida in 2007, and and in 2008 there were numerous reports throughout the eastern US in both greenhouse and field-grown basil. Dr. Meg McGrath, vegetable pathologist at...

A Tale of Two Leaf Spots on Zinnia

Two leaf spots are often found on zinnias. Alternaria is a fungal leaf spot that produces lesions start out as small dark spots (Fig. 1), very similar to those caused by Xanthomonas , a bacterial pathogen of zinnia. As the disease progresses in the greenhouse, spots caused by the fungus Alternaria...

Sycamore Anthracnose

Sycamore Anthracnose Conditions were perfect in spring 2013 for a severe outbreak of sycamore anthracnose, caused by the fungus Apiognomonia veneta (say that three times!). We have had many reports in the past of American sycamores ( Platanus occidentalis ) and London plane trees (a cross between...

Conference Lectures

February 27, 2020 Innovative Lawn Care Conference After the Ban (in Ontario Canada): Moving toward biologically-managed turfgrass - Michael Brownbridge, Biobest Diseases in turfgrass: A biological approach - David Clement, UMD Extension Controlling Insects in Turfgrass With Organic Controls - Kevin...

Using Banker Plants to Control Aphids in Greenhouses

pdf version Biological Control of Aphids – Succeeding in Maryland Vegetable transplants are a big seller for greenhouse operations. With the recovering economy, customers are planting vegetable and herb gardens. Vegetable transplants have insect problems like any other greenhouse crop. Tomato,...

Diseases on Greenhouse and Cut Flower Crops

Impatiens Downy Mildew Alert: Impatiens downy mildew Alternatives to garden impatiens Botrytis Reducing Botrytis Leaf Spots Two leaf spots on zinnia Downy Mildew On coleus and basil Rust Chrysanthemum White Rust


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