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Impatiens Downy Mildew

The disease is caused by the funguslike microorganism, Plasmopara obducens , and is favored by cool, moist conditions. However, we continued to see symptoms even in hot weather. The disease affects both seed and cutting propagated Impatiens walleriana . It appears that New Guinea impatiens plants are resistant or tolerant.

Boxwood Blight

Back to Diseases - Shrubs Row of infected boxwoods in CT. Photo: Sharon Douglas, PhD, Plant Pathologist, Connecticut Agricultural Experiment Station Box blight or boxwood blight has been causing defoliation of boxwoods throughout Europe since the late 1990’s. In October 2011, the disease was found...

Sudden Oak Death/Ramorum blight

Symptoms on infected rhododendron To date, Sudden Oak Death has not been found infecting oak trees in Maryland. The name "sudden oak death" is somewhat misleading and the disease is increasingly being referred to as " ramorum blight ", or " ramorum dieback ". Popular landscape plants including...

Invasive Diseases

An invasive species is a non-native species whose introduction causes or is likely to cause economic harm, environmental harm, or harm to human health. Learn more about invasive diseases of concern in Maryland.


Strawberry Planting and Maintenance: Selection and Planting/Training Care (Fertilizing, harvesting, spray schedule info., etc.) Renovation/Overwintering Strawberry Problems The strawberry plant is composed of leaves, a crown (compressed, modified stem), and a root system. In heavy clay soils, 90%...

Raspberries and Blackberries (brambles)

Brambles Planting and Maintenance: Selection and Planting Care (fertilizing, harvesting, spray schedule info) Training/Pruning Raspberry-Blackberry Problems Red raspberries Black raspberries Purple raspberries Yellow raspberries Blackberries Brambles are defined as any species belonging to the...


Blueberry Planting and Maintenance Selection and Planting Care (fertilizing, harvesting, spray schedule info., etc.) Pruning Blueberry Problems Several species of blueberry are indigenous to the United States. These include the lowbush blueberry ( Vaccinium angustifolium ) found in Maine and Canada...

Kudzu Bug

The kudzu bugs love kudzu and are one rare example of an invasive feeding on another invasive. Since kudzu is one of its favored hosts in Asia, it is expected that the bug will continue to spread throughout the areas in the U.S. where kudzu grows. It would be nice if the kudzu bug only fed on kudzu but, unfortunately this critter feeds on the leaves and stems of soybeans and can cause serious yield losses.

Japanese Cedar Longhorned Beetle

This beetle has been in New England, North Carolina, and the west coast for some time. It was found in Maryland in 2011. It is a relatively small longhorned beetle (~3/8in). Females are reddish brown and males are black with reddish “shoulders.” Adults emerge mid-April through May. Hosts include...

Sirex Woodwasp

The Sirex woodwasp (SWW) is an exotic, invasive pest considered one of the top 10 most serious forest insect pests worldwide. SWW primarily attacks pine species. It has no natural controls outside its native range and causes extensive losses in areas where it is accidentally introduced. It is...


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