MYCELIUM OF LIMB RUST FUNGI |
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Authors: | R. S. Peterson R. G. Shurtleff Jr. |
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Affiliation: | Intermountain Forest and Range Experiment Station, Logan, Utah |
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Abstract: | Limb rust is a killing disease of hard pines caused by Peridermium spp. Study of tissue sections shows that growth of limb rust fungi differs from growth of other plant rusts: (1) longitudinal spread is mainly by hyphal growth within host tracheids; (2) hyphae grow radially in mature xylem, deep in host sapwood; (3) in larger stems mycelia avoid (rather than concentrate in) bark and outer xylem rings; and (4) mycelia become much larger than any previously described for rust fungi. Antibiotics being tested as therapeutants are unlikely to be effective against such deep-seated mycelia. |
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