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Tomatoes 2008
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Hollyhock Rust
Hollyhock rust is caused by the fungus Puccinia malvacearum. The undersides of infected leaves show raised brown spots about the size of a pinhead. The upper leaf surfaces usually show a yellow to orange discoloration above the brown spots. Infected areas may run together and destroy large portions of the leaf. Stems may also be infected. To control rust on hollyhock, remove the first leaves on which rust is evident. Spraying with a fungicide, such as Daconil 2787, can be effective. Sprays should start when the new growth appears in the spring and repeated 7 to 10 days apart. When the flowering season is over, cut the plants back to the base and destroy the infected plant parts. In New Mexico rust is endemic on some of the native plants of the hollyhock family such as the orange flowered globe mallow. Controlling rust then may depend on controlling the plants on roadsides and vacant areas. The globe mallow however, is useful for providing color in the native landscape and may even be useful as a ground cover. It responds well to pruning or even mowing and if mowed regularly can provide broad stretches of color. The Botanic Garden has other color forms of this mallow which might be useful in landscapes. Other garden plants affected by rust includes snapdragons and their relatives. . |
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Go to nmmastergardeners.org/ to find these and other articles in a pdf. format that you may use to print out a book with much of this material from that web site. Those articles, however, may not have been modified since they were originally printed in 2001.
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