Rust

Pest: Rust (Puccinia spp. and others)

Pest Type: Infectious disease, fungus

Major Identifying Features: Rust appears as powdery masses of yellow, orange, purple, black, or brown spores on leaves and sometimes stems, they are more commonly found on the underside of leaves

Life Cycle: Many rust fungi have complicated life cycles that can include several different spore stages and one or two different hosts, urediniospores are windborne and infect the plant through stomata, water is required for germination and infection, heavy dew can be sufficient, rust can overwinter on leaves that remain on the plant

Pest Rating: Moderate

Management Rating: Moderate

Host/Season/Outbreak Information: Rust fungi have many different hosts, breakouts are encouraged by water and warm temperatures

Damage Information: The upper surface of heavily infected plants may curl, wither, and drop prematurely, severely infected plants may be stunted, some rust species cause tissue swellings, galls, or cankers, this can result in stem dieback, and can (rarely) kill the plant

Management Options: Physical control with hot water, cultural control by proper irrigation methods and proper pruning, and removal of infected leaves (rapid compost, burial), chemical control with fungicides, Mancozeb as a protectant and myclobutanil as an eradicant, WARNING ON THE USE OF CHEMICALS

Sources:

http://www.ipm.ucanr.edu

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