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Mary Ann Hansen

Title Summary Date ID Author(s)
Best Management Practices for Boxwood Blight for Greenery Producers Oct 13, 2016 PPWS-39NP (PPWS-95NP)
Best Management Practices for Boxwood Blight for Professionally Managed Landscapes and Public and Historic Gardens in Virginia

Boxwood blight is caused by the fungal pathogen Calonectria pseudonaviculata (syn. Cylindrocladium buxicola). Boxwood blight was first described in the United Kingdom in the mid-1990’s and by 2002 was found in several other European countries and New Zealand. In September 2011 boxwood blight was discovered in North America. Symptoms of the disease include leaf spotting (Fig. 1), elongate, dark cankers on stems (Fig. 2), defoliation, and dieback (Fig. 3). The primary means by which the disease spreads is the inadvertent introduction of infected boxwood to existing plantings. The pathogen can also spread by spores, which readily adhere to equipment and work clothes, and by microsclerotia, which survive in infested soil and plant debris. This document outlines best management practices for landscapers and property managers to reduce the risk of spreading boxwood blight to landscapes and public and historic gardens, and to manage the disease if it is introduced.

Sep 26, 2016 PPWS-49NP (PPWS-84NP)
Best Management Practices for Boxwood Blight in Virginia Production Nurseries WITHOUT Boxwood Blight Version 2, September 2016

Boxwood blight (also known as box blight), caused by the fungus Calonectria pseudonaviculata, is a serious fungal disease of boxwood that results in defoliation and decline of susceptible boxwood. In Virginia boxwood blight was first identified in a nursery location in Carroll County in 2011. By the fall of 2013 it was found in other commercial nursery/retail operations and landscapes in several counties in Virginia

Sep 30, 2016 PPWS-33NP (PPWS-86NP)
Best Management Practices for Boxwood Blight in the Virginia Home Landscape: Version 2, September 2016 Sep 30, 2016 PPWS-29NP (PPWS-85NP)
Best Management Practices for Boxwood Blight: Best management practices for Virginia retail nurseries WITH boxwood blight Version 2, August 2016 Sep 30, 2016 PPWS-34NP (PPWS-89NP)
Best Management Practices for Boxwood Blight: Best management practices for Virginia retail nurseries WITHOUT boxwood blight Version 2, September 2016 Sep 30, 2016 PPWS-35NP (PPWS-88NP)
Best Management Practices for Boxwood Blight: Best management practices for boxwood blight in Virginia production nurseries WITH boxwood blight Version 2, September 2016 Sep 30, 2016 PPWS-32NP (PPWS-87NP)
Botrytis Blight of Peony Sep 26, 2016 450-602 (PPWS-93NP)
Boxwood Blight: A New Disease of Boxwood Found in the Eastern U.S. Jan 5, 2012 PPWS-4
Corn Smut May 1, 2009 450-706
Entomosporium Leaf Spot of Photinia

Photinia, a shrub belonging to the plant family
Rosaceae, is a popular landscape shrub in the
southeastern U.S. Several species are grown, but
the most popular is the hybrid Photinia ×fraseri, or
“redtip”, so named for its bright red, immature foliage.
The biggest drawback to growing photinia is a leaf
spot disease caused by the fungus Diplocarpon mespili
(syn. Entomosporium mespili) to which redtip is
highly susceptible.

Sep 30, 2016 450-609 (PPWS-82P)
Impatiens Downy Mildew May 21, 2013 PPWS-19NP
Iris Leaf Spot

Iris leaf spot (also called Heterosporium leaf spot) is the
most common disease of iris in Virginia. It is caused by
the fungus Cladosporium iridis (syn. Heterosporium
iridis). Leaf spotting is most conspicuous on the
upper half of the leaf following bloom. Although this
pathogen is most common on bulbous iris, it can also
cause severe damage to rhizomatous iris, and has also
been reported on Gladiolus, Freesia and Narcissus

Nov 1, 2016 450-600 (PPWS-90NP)
Juniper Tip Blights

In Virginia, juniper tip blight is caused by one of
two different fungi, Phomopsis juniperovora or
Kabatina juniperi. Symptoms of the two diseases
are identical; however, some aspects of their control
differ. Therefore, correct identification of the causal
agent is important. These fungi can also attack other
hosts, including Cryptomeria, Chamaecyparis, and
Thuja species. They seldom cause significant damage
in landscapes unless weather conditions become
favorable for disease development. However, they
can be very destructive in seedbeds, cutting beds,
and lined-out stock in nurseries, or in mass landscape
plantings that receive overhead irrigation.

Jan 27, 2017 450-601 (PPWS-91NP)
Leaf and Flower Gall of Azalea and Camellia Oct 18, 2016 450-605 (PPWS-92NP)
Plant Injury From Herbicide Residue

In recent years, an increased number of cases of
injury from herbicide residue in straw/hay, manure,
and compost have been diagnosed in the Virginia
Tech Plant Disease Clinic. Growers are surprised and
dismayed to learn that manure, straw, mulch, or other
amendments intended to improve their garden or
landscape might have such unforeseen consequences.
Of particular concern to organic growers are herbicide

Aug 22, 2016 PPWS-77P
Powdery Mildew of Ornamental Plants May 1, 2009 450-603
Problem-free Shrubs for Virginia Landscapes Jun 27, 2016 450-236 (PPWS-69P)
Problem-free Trees for Virginia Landscapes Oct 19, 2016 450-237 (PPWS-70P)
Rose Rosette Disease Sep 17, 2012 450-620 (PPWS-10P)
Virginia Boxwood Blight Task Force May 20, 2014 PPWS-30