Daylily rust (Puccinia hemerocallidis)
has been found on nursery stock in Peabody, MA in
Essex County. Symptoms of daylily rust were observed
on seventeen plants from Monrovia and one plant from
Van Burkem; however, the Dept. of Agricultural Resources
is unsure of where the infection originated. Once
the disease was confirmed by Rob Wick, plant pathologist
at the University of Massachusetts, the eighteen infected
plants were destroyed. The remaining block is being
held under quarantine for two weeks to see if they
develop symptoms. The other daylilies in this establishment
will receive a fungicide treatment.
Daylily rust was first detected in four states in
the southeastern United States in 2000. As of January
2003, it was present in a total of 24 states. In 2003
several cases were reported in Massachusetts. Due
to the limited number of cases of daylily rust in
Massachusetts it is possible to eradicate this disease
in the state. If daylily rust is confirmed on their
plants, growers will be ordered to destroy symptomatic
plants and follow quarantine procedures.
Please look for the symptoms of this disease on new
stock coming into your nurseries or gardens. Raised
orange-yellow to red-brown pustules will appear on
both the upper and lower surfaces of the leaves infected
with daylily rust. If you rub a tissue along the surface
of the leaves, it will pick up the bright orange spores.
For photos of the symptoms visit websites listed below.
The Massachusetts Department of Agricultural Resources
is asking growers to report daylily rust via the MA
Introduced Pests website (http://www.massnrc.org/pests)
or via the plant pests and noxious weed hotline at
Resources on identifying and treating daylily rust:
Fact sheet from UMass Extension Floriculture Program
on daylily rust details how to detect, treat, and
limit the spread of this disease.
This website from Canada contains excellent photos
of the symptoms of daylily rust and other symptoms
that could be mistaken for daylily rust.
National Plant Board
This pest alert is from the Massachusetts Introduced
Pests Outreach Project, a collaborative project between
the Massachusetts Department of Agricultural Resources
and the UMass Extension Agriculture and Landscape
Program aimed at preventing the establishment of new
pathogens and pests in Massachusetts. Visit the project
for more information on other emerging pests and to
subscribe or unsubscribe from our pest alert list.