| HOST PLANT |
DISEASE |
SYMPTOMS |
MANAGEMENT |
Cherry/Chokecherry
and other
Prunus spp. grown as landscape plants Prunus spp. |
Bacterial spot and canker, Pseudomonas syringae pv.
syringae |
Angular or circular, red/brown lesions which drop out
giving the leaf a tattered appearance. Occasionally cankers form on twigs
and branches. |
Seldom serious in landscape settings. Prune cankered wood
during dormant period. Cleap up leaves and other debris in
fall.
CHEMICAL: Copper. |
| Black knot, Apiosporina morbosa |
Infection occurs in spring with olive-green, elongate
swellings on branches visible the next spring. Galls turn woody and
black later that second summer. |
Remove infected branches 3-4” below galls before
budbreak.
Remove nearby wild chokecherries.
CHEMICAL: Apply lime sulfur as a
dormant application following pruning or thiophanate-methyl when dormant,
at pink bud, full bloom and 3 weeks later. |
| Brown rot, Monilinia fructicola |
Sudden browning and death of flowers. Cankers on small
branches. Most noticeable is the browning and dropping of fruit, often
with a gray/brown spore mass on the surface. Infected fruits shrivel (form
mummies) and persist on the tree through winter. |
Remove and destroy all mummified fruit.
CHEMICAL:
Benomyl, captan, chlorothalonil, ferbam, iprodione, myclobutanil (cherry
only), propiconazole, thiophanate-methyl, vinclozolin, wettable sulfur.
Begin as flower buds first open and continue as per label
directions. |
| Canker, Valsa leucostoma, Leucostoma sp. |
First symptoms appear on young branches with brown drooping
leaves. Elliptical cankers develop at the base of these branches and
produce fruiting bodies that exude hairlike yellow tendrils in the spring.
Cankers may become perennial. |
Promote tree vigor and prevent mechanical damage. Remove
and destroy infected branches. Only plant on good sites for Prunus
spp.
CHEMICAL: None. |
| Leaf spot, Blumeriella jaapii (formerly
Coccomyces hiemalis) |
Dark purple spots initially on young leaves. Spots become
red/brown and fall out of leaf or entire leaf may yellow and drop. |
Remove and destroy infected plant material. Avoid wetting
foliage.
CHEMICAL: Captan, chlorothanonil, dodine, fenarimol,
iprodione, myclobutanil (cherry only), propiconazole, sulfur, or
thiophanate-methyl. Begin at petal fall. |
| Plum pockets and leaf curl, Taphrina communis |
Swollen, discolored, and distorted branches. Fruits enlarge
greatly and are bladderlike or spongy and pale yellow/green in color. |
Remove diseased fruit and twigs.
CHEMICAL: Bordeaux
mixture or lime sulfur during dormancy. |
| Western X disease, caused by a spiroplasma |
This organism is transmitted by leafhoppers. Early in the
growing season light green to yellow foliage indicates the initial stages.
New growth may be thicker. Leaves receiving full sunlight turn reddish
brown. Proliferation of leaves or stems at the ends of new growth is
common. Infected plants die after 3 years. |
Rogue out infected plants.
CHEMICAL: None. |
