Biology Reference
In-Depth Information
north central states. Cinnamon brown spore pus-
tules cover both leaf surfaces with black pustules
toward autumn. The disease is not often serious
enough for control measures.
Puccinia sparganioides (
P. peridermiospora
).
Ash Rust
.0, I, general on ash east of the Great
Plains; II, III on marsh and cord grasses (
Spartina
spp.). Ash twigs and petioles are swollen and
leaves distorted. Cluster cups filled with yellow
powdery aeciospores are formed in the swellings.
In New England, where rust is often severe, the
most important infection period on ash is May 15
to June 20, with 6 to 8 hours of damp air neces-
sary. Marsh grasses are infected and reinfected
July 20 to August 20.
Puccinia stenotaphricola On St. Augustine
grass, Florida.
Puccinia striiformis (
P. glumarum
).
Stripe
Rust
of wheat. II, III on wheat, barley, rye, redtop,
orchardgrass, and many other grasses. Uredial
stage is yellow, and pustules are formed in
streaklike clusters on leaves; telia are in black
streaks.
Puccinia substriata
Rust
on eggplant.
Puccinia taneceti
Chrysanthemum Rust
. I
general; III known only in Japan; 0, I unknown.
Small blisters of pinhead size appear on under-
side of leaves and occasionally on upper surface.
The spore mass is dark reddish brown and pow-
dery. The rust is more common in greenhouses
than outdoors. Optimum germination is at 60
to
70
F; spores are killed at high temperatures.
Puccinia tanaceti var. dracunculina (formerly
Puccinia dracunculi
). On artemisia, Wisconsin to
the Pacific Coast.
Puccinia thaliae (
P. cannae
). II, III on edible
canna, garden canna, and maranta.
raspberry, not black. This rust appears late in
the season on Cuthbert and other susceptible
varieties, in northern half of the country, most
common east of the Mississippi. Fine light yellow
powdery masses of spores appear on basal leaves,
leaf petioles, shoots, and even fruit.
Pucciniastrum epilobii
Fuchsia Rust
, the alter-
nate hosts are species of Abies.
Pucciniastrum goeppertianum
Fir-
Huckleberry Rust
,
Blueberry Witches' Broom
.
0, I on firs; III on low and high bush blueberries.
The fungus is systemic and perennial in blue-
berries, producing short swollen twigs in
a witches' broom effect, and telia forming
a polished red layer around the shoots. Destroy
diseased bushes; keep blueberry plantations some
distance from firs.
Pucciniastrum hydrangeae 0, I on eastern and
Carolina hemlock; II, III on hydrangea.
Pucciniastrum vaccinii (
P. myrtilli
).
Hemlock
Rust
,
Leaf Rust
of blueberry; widespread. 0, I on
eastern hemlock; II, III on azalea, blueberry,
cranberry, lyonia, menziesia, and rhododendron.
This is the most common hemlock rust, but often
only a single leaf or twig is infected. Aecia are
formed on current-year needles. Blueberries have
yellow pustules, on leaves only, with defoliation
in mid-or late summer.
Ravenelia
Pucciniaceae. Autoecious, tropical with only
a few species in United States. Teliospores more
or less muriform, with compound stalks.
Ravenelia
Ravenelia
fragrans
var.
evernia
). On
Mimosa
, Arizona.
Ravenelia fragrans var. evernia (formerly
Ravenelia dysocarpae
). On
Mimosa
, Arizona.
Ravenelia humphreyana On
Poinciana
, Flor-
ida, Texas.
Ravenelia indigoferae On
Indigofera
, Arizona.
dysocarpae (see
▶
Pucciniastrum
Melampsoraceae. Heteroecious with perennial
mycelium, pycnia and aecia on conifers: firs and
spruces; pycnia subcuticular, other sori subepi-
dermal; telia may be intraepidermal; aecia and
urediospores yellow.
Pucciniastrum americanum
Late Leaf Rust
of
raspberry. 0, I on white spruce; II, III on red
Maravalia (Scopella)
Pucciniaceae. Tropical. Uredia and telia subepi-
dermal. Teliospores one-celled, on pedicel.
