Pathogen—Fir broom rust is caused by the fungus Melampsorella caryo-phyllacearum. Spruce broom rust is caused by the fungus Chrysomyxa arctostaphyli. Hosts—Many true fir species …

Rust pustules (aecia) develop on the leaves. Leaves fall prematurely in August. Infected shoots continue to develop and branch yearly resulting in large brooms. Unlike brooms due to dwarf …

The rust induces juvenile needles to form which are sharp pointed needles in contrast to the smooth rounded mature needles found on the other areas of the tree. When wet, the telia …

Most of the rust fungi initially infect and cause diseases of foliage. However, some spread into branches and stems, colonizing the phloem and cambium. Rusts cause cankers (dis-eases of …

Fir broom rust is caused by the fungus Melampsorella elatina. This rust species causes perennial infections in both true firs and in an alternate host, chickweed (Cerastium) and its related …

Broom rusts are fungus-caused diseases that result in the formation of witches-brooms in the branches of infected trees. “Witches-broom” is a generic term for a localized proliferation of …

Fir broom rust gets its name from the proliferation of shoots on affected fir stem ends, which leads to broom-like growths. These growths may occur randomly anywhere on the tree but are most …

Studies have shown that cultivation and fertilization clearly increase rust infection. Selection of superior trees was first done without regard to rust resistance. The first seeds of loblolly and …