Shasta Daisy
(Sclerotinia sclerotiorum) Plants wilt and die. Basal stem rot. Cottony mycelium present in and on stems under moist conditions. Large black sclerotia form in and on stems. Fungus survives in soil as sclerotia that ... [... more]
University of California IPM |
Peony
(Verticillium dahliae) Plants wilt at flowering, but no basal rots are present. The water-conducting tissue (xylem) in stems is discolored. Infected plants may appear to recover, but symptoms will reoccur the ... [... more]
University of California IPM |
Azalea
(Pythium spp., Phytophthora spp.) Plants are low in vigor. Leaves wilt and turn dull green and fall, so only a few terminal leaves remain on the plant. Plants frequently die. Wood under bark at soil line is ... [... more]
University of California IPM |
Marguerite Daisy
(Sclerotinia sclerotiorum) Plants wilt and die. Basal stem rot. Cottony mycelium present in and on stems under moist conditions. Long, black sclerotia form in and on stems. Fungus survives in soil as sclerotia, which ... [... more]
University of California IPM |
Cymbidium Orchid
(Sclerotium rolfsii) Rapid rotting and collapse of the leaf bases and stem. White fungus growth and small resting structures (sclerotia) that resemble mustard seeds usually present on plant and planting medium. ... [... more]
University of California IPM |
Snapdragon
(Puccinia antirrhini) Pustules of dark brown to purple powdery spores develop on leaves and stems. Rapid water loss from severely rusted leaves causes them to dry up. On living snapdragon plants and spores on seed. ... [... more]
University of California IPM |
Weed Classifications
Growing site and production practices largely determine which weeds are likely to become problems at a site. For example, weeds commonly associated with container nursery production include creeping woodsorrel, ... [... more]
University of California IPM |
Pythium Root Rot
The fungi that are responsible for Pythium root rot, also known as black rot or water mold, are present in practically all cultivated soils and attack plant roots under wet conditions. These fungi can be spread by ... [... more]
University of California IPM |
Easter Lily
(Botrytis elliptica, B. cinerea) Circular or oval orange or reddish brown spots usually appear on older leaves. Under damp conditions, woolly gray fungal spores form on spots. Brown spotting of blooms occurs. ... [... more]
University of California IPM |
Begonia
(Erysiphe cichoracearum, Odium begoniae) White, powdery spots develop on upper and lower leaf surfaces and small, greasy spots occur on undersides of leaves. Also may appear on flowers of some fibrous begonias. On ... [... more]
University of California IPM |
Special Weed Problems For Field-Grown Trees And Shrubs
YELLOW NUTSEDGE. Yellow nutsedge, sometimes call nutgrass, is a perennial sedge that is often confused with a grass. Fumigation before planting is very effective in controlling this weed. Repeat applications of ... [... more]
University of California IPM |
Leafhoppers And Sharpshooters
Other monitoring methods, including beating samples and visual counts, can be used to detect the presence of leafhoppers and sharpshooters. Beat or sweep sampling for nymphs and adults is most effective when ... [... more]
University of California IPM |
