Infection is favoured by prolonged leaf wetness, so rusts are usually diseases of wet summers. Spots on the upper leaf surface turn brown as the disease progresses, and heavily infected foliage turns yellow, dries and drops, often leading to complete leaf loss on the geranium. Rust fungi have very limited host ranges. Causes of rust spots on leaves: Rust is caused by a group of fungi from the Pucciniales order. Different rust fungi attack different host plants so rust on gerananiums won’t spread to other types of plants. Badly infected leaves will drop and younger plants can be severely stunted or die. Rust spores can be killed by high temperatures. Leaf Spot Diseases. Caused by pathogenic fungi of the order of Pucciniales. For example, the rust that attacks antirrhinum is a different species from that affecting hollyhock. Because water is necessary for infection, overhead irrigation should be avoided when rust … It shows up as a scattering of orange, yellow or red spots on foliage. High humidity and prolonged leaf wetness encourage these pathogens. Leaf Rust SYMPTOMS Leaf rust, caused by the fungal pathogen Puccinia pelargonii-zonalis, is characterized by small yellow spots on the upper surface of the leaf and rust-colored pustules that develop in the spots on the underside of the leaf. Plants Attacked A wide variety including: roses, daylilies, frangipani, myrtles, snapdragons, geraniums, orchids In addition, yellow spots may develop on the leaf tops. Rust can also attack turf. Geranium leaf rust first appears as small, yellow spots on the lower leaf surfaces that rapidly increase in size and become rusty brown spore pustules. Creates postules or markings on the leaves that often look like iron oxide (rust) and often causes leaves to twist or distort. By late summer there may be many different rust species present on various plants in the garden. Hardy geraniums infected with Cercospora leaf-spot fungi display sunken, bleached leaf lesions that gradually darken and may merge into V-shaped patches of dead tissue. Geraniums with leaf rot can develop pustules that look like rust. Geranium leaf rust first appears as small, yellow spots on the lower leaf surfaces that rapidly increase in size and become rusty brown spore pustules. Spores are often formed in a circular fashion around Infected leaves usually show yellow discolouration on the upper side of the leaf corresponding to where the rust spore is located on the underside. Rust. Left untreated, the spots get bigger and turn into bumpy-looking pustules. A wide variety of garden plants are affected by rust. The pustules break open and release spores. Small yellow spots appear opposite the pustules on the upper leaf surface but generally do not develop rings. Irregular, concentric rings of rusty pustules form around the original spot. Leaf Rust. Some rust infections, such as geranium rust (Puccinia pelargoni-zonalis), can be eradicated by hot water treatment of cuttings, but some damage to the host can occur. Removing affected leaves, drier conditions, soil adjustment, or chemical sprays can resolve the problem. Rust fungus grows within the leaf so there is usually a copy of the spores on the underside of the leaf as well. Geranium rust. Caused by Pucinia pelargoni-zonalis, geranium rust is most common on florist’s geranium (Pelargonium X hortuorum), though it has been reported on zonal and seed geraniums as well. The disease is unsightly, and can affect the vigour and yield of plants. Geranium rust is widespread throughout the United States due … The first signs of rust are tiny specks or spots on leaves that range in color from orange to rusty-brown, brownish-yellow, purple and red. These pustules can break open and cause a circular, rust-colored mark on the leave. 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