University of Maryland Extension

Integrated Pest Management

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German Irises: Variegated and Reblooming Options

Article and Photos by Ginny Rosenkranz, Extension Educator, University of Maryland Extension The German bearded iris ( Iris barbata ) is one of the many irises to grow in a nursery for garden center and landscape customers. Usually, they bloom only in spring (May through June) and come in a rainbow...

Alternative Energy and Labor Saving Field Day

As part of our work with the commercial ornamental horticulture industry, we have been organizing alternative energy field days since 2005 in cooperation with MNLA, LCA and MGGA. We conducted a tour of several locations that have implemented energy saving methods on October 20, 2011. Brent Rutley,...

Ambrosia Beetles in Maryland

Introduction Order: Coleoptera: family: Scolytidae: Sub family Scolytinae: Scolytini: Xyleborina In Maryland we have many species of native ambrosia beetles. These native species of ambrosia beetles have evolved over time with the native species of plants. We generally observe that these native...

Reducing Botrytis in Greenhouses

In the spring during extended periods of cloud cover, rain and generally poor selling conditions for bedding plants, Botrytis is hard to avoid. Greenhouses can stack up with plants and air circulation drops rapidly. With these conditions the fungal spores can spread quickly and infect many plants...

Biological Control of Spider Mites

Two predaceous mites, Neoseiulus californicus and Mesoseiulus longipes , tolerate low humidity levels and high temperatures and can be used in interiorscape situations as well as in production greenhouses. N. californicus tolerates the highest temperatures of the available predaceous mites. It is a...

Oedema: An Abiotic Problem

Oedema occurs during cool, cloudy weather when the soil is moist and warm. Symptoms can show on plants in greenhouses and landscapes. During moist and warm periods, plants can take in large amounts of water without transpiring it. Pimple-like blisters appear as the cells swell with water. The cells...

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