Biology Reference
In-Depth Information
on apple, apricot, peach, pear, quince, plum,
cherry, willow, and mountain-ash. Valsa salicina
(
Cytospora salicis
).
Twig and Branch Canker
of
willow.
Valsa sordida
▶
Volutella buxi
Boxwood “Nectria” Canker
,
Volutella Blight
. The teleomorph state of the fun-
gus is supposed to be
Pseudonectria rouselliana
,
which see. As a canker the disease often follows
after winter injury, with salmon-pink spore pus-
tules on dying twigs, branches, and main stems.
As a blight, the fungus spreads rapidly in moist
weather in summer, attacking healthy twigs when
humidity is high and often discernible at
a distance by a straw yellow “flag.” On such
yellowing branches the backs of leaves and the
bark of twigs are both covered with the pinkish
spore pustules.
Control
Cut out branches where the bark has
been loosened by winter ice and snow. Have
a yearly “housecleaning,” brushing out accumu-
lated leaves and other debris from interior of
bushes and cutting out all twigs with pink pus-
tules. If there are signs of disease, follow cleaning
with thorough spraying, from ground up through
interior of bushes, with lime sulfur.
Cytospora chrysosperma
.
Vermicularia
Deuteromycetes, Coelomycetes
Like
Colletotrichum
but setae are scattered
throughout the acervuli, not just marginal; spores
hyaline, globose to fusoid.
Vermicularia ipomoearum
Stem Canker
of
morning glory.
Volutella
Blights
.
▶
