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How to Manage Pests
UC Pest Management Guidelines
Turfgrass
Rust
Pathogens: Puccinia striiformis, P. graminis, P. coronata, and Uromyces spp.
(Reviewed 6/03,
updated 6/03)
In this Guideline:
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DESCRIPTION OF THE DISEASE
Rust begins as small yellow spots on leaves and stems that form elongated,
reddish brown or orange pustules. Shoes and clothes are often stained orange by
the spores when walking through infested areas. Rust kills leaves and
debilitates plants when it is severe. The turfgrass quality is reduced because
of poor color and reduced plant vigor. Rust survives as dormant mycelia in
infected plants and as teliospores; it may spread to turf from infections on
other grasses and woody ornamentals.
SUSCEPTIBLE TURFGRASSES
Bluegrasses, ryegrasses, zoysiagrass, and tall fescue.
CONDITIONS FAVORING DISEASE
Moderately warm, moist weather favors rust development. Moisture in the
form of dew for 10 to 12 hours is sufficient for the spores to infect
plants. Warm air temperatures (70° to 75°F) and extended periods
of leaf wetness favor the development of the disease. The disease is more
severe in turf deficient in nitrogen.
MANAGEMENT
Rust can usually be managed with proper mowing, fertilizing, and irrigation
practices.
Cultural Control
To reduce the incidence of rust, maintain turfgrass vigor by applying adequate
but not excessive nitrogen fertilization and irrigate in the morning according
to the evapotranspiration needs of the turfgrass. Provide good air movement on
surface of grass. Mow the turfgrass regularly and remove clippings if the lawn
is infected to reduce the number of spores. Mixtures of several compatible
turfgrass species fare better against rust than turfgrass composed of a single
species. Most Kentucky bluegrass and tall fescue varieties currently marketed
in California are fairly resistant to rust.
Treatment Decisions
Rust can usually be managed successfully through cultural practices, but in
severe cases fungicide applications can be made.
| Common name |
Chemical class |
Many of these products are available for use by licensed applicators only and cannot be used by home gardeners.
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| A. |
AZOXYSTROBIN |
QoI (strobilurins) |
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| B. |
CHLOROTHALONIL |
Chlorophenyl (multi-site) |
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| C. |
MANCOZEB |
EDBC (multi-site) |
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| D. |
MYCLOBUTANIL |
DMI |
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| E. |
PROPICONAZOLE |
DMI |
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| F. |
THIOPHANATE-METHYL |
Benzimidazole |
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| G. |
TRIADIMEFON |
DMI |
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| H. |
TRIFLOXYSTROBIN |
QoI (strobilurins) |
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UC IPM Pest Management Guidelines: Turfgrass
UC ANR Publication 3365-T
Diseases
F. Wong, Plant Pathology, UC Riverside
M. A. Harivandi, UC Cooperative Extension, Alameda Co.
J. Hartin, UC Cooperative Extension, San Bernardino Co.
Acknowledgment for contributions to the disease section:
M. E. Grebus, Plant Pathology, UC Davis
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