|Rusts - (several species)
Rusts - (Apple-cedar rust, Juniper-hawthorn Rust)
L. Barnard, Florida Dept. of Ag & Consumer Sciences,
Atthowe, Missoula County Extension
occurs anywhere that perennial hosts (juniper, cedar, etc.) grow
near their deciduous hosts.
leaf spots, defoliation and fruit and twig deformities. Juniper
infections appear as swellings on deciduous host or galls on twigs,
these form gelatinous orange fruiting bodies in the spring.
Gall Rusts - Endocronartium harknessii
Atthowe, University of Montana
Fred Baker, Utah State University, www.ipmimages.org
mugo, Scots, Austrian and ponderosa pine.
globular galls on trunks or branches of pines. When the fungus is
fruiting the galls are yellow or orange.
Pine Blister Rust - Cronartium ribicola
W. Schwandt, USDA Forest Service, www.ipmimages.org
fungus attacks all five needle pines.
elongated cankers develop on trunks. Orange spore masses burst through
cankered bark. Pitch flows around the canker wound.
Baldo Villegas - firstname.lastname@example.org
spots are present on leaves. Spots on canes are orange, but become
black in the fall and winter.
temperatures for rust infections are 64-70° F. High temperatures
(>85° F.) and dry weather discourage rust disease.
Cultural: Irrigate early enough in the day so that
plant surfaces have time to dry before the cooler temperatures of
evening. Keep irrigation off of leaves, branches, and trunk.
Maintain plants for good air circulation. In the case of vegetables,
plant rows to run with the prevailing winds.
Use resistant cultivars, where available (see specific vegetable
Mineral: Sulfur sprays can be effective if sprayed
preventatively when rust infection periods occur.