University of Maryland Extension

Integrated Pest Management

Base Name: 

Impatiens Downy Mildew

Introduction Severe outbreaks of downy mildew in garden impatiens ( Impatiens walleriana ) were reported in the fall of 2011 on landscape plantings in Europe as well as in the US (Northeast, Midwest). In February 2011, the disease was reported in Florida landscapes and nurseries. In Maryland, the...

Problems Controlling Whitefly

On Poinsettia: There were some really tough whiteflies in greenhouses in Summer 2013. Two growers received poinsettias in the spring from the West Coast. One shipment came in late March for stock plant production. The other greenhouse operation received plants in April to produce tree poinsettias...

Greenhouse Pest Alert: European Pepper Moth

pdf version The European pepper moth (EPM), Duponchelia fovealis (Zeller), a relatively new invasive species, has been confirmed in a Maryland greenhouse operation. Greenhouse managers and Extension people working with greenhouse growers should be alert and monitor for this new pest. How much...

Biological Control

Greenhouse and Cut Flower Production: Using Banker Plants in Greenhouse for Aphid Control Biological Control of Spider Mites

Greenhouse Insects

Winter/Spring 2014 European Pepper Moth: In 2013, european pepper moth caterpillars were found feeding on geranium, petunia, mums and poinsettias. The caterpillars feed on foliage as well as bore into the plant stems at the base. Be sure to check compost piles near the production areas because...

What Crops Up on Impatiens?

Garden impatiens and New Guinea impatiens are significant crops for the greenhouse industry and are used heavily in home and commercial landscapes. With the recent occurrence of Impatiens downy mildew on garden impatiens, many growers decided in 2013 to reduce or eliminate production of garden...


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