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Witches' brooms-sources of new and interesting dwarf forms of Picea, Pinus and Tsuga species


, : Witches' brooms-sources of new and interesting dwarf forms of Picea, Pinus and Tsuga species. Acta Horticulturae (54): 25-32

The various causes of witches' brooms in conifers are discussed. The non-pathogenic type appears to result from a bud mutation or sport and the dwarf, dense growth habit can be perpetuated vegetatively. Data are tabulated on the segregation of normal and dwarf seedlings and variability among seedlings raised from witches' brooms of Picea abies, Pinus resinosa, Pinus strobus and Tsuga canadensis. Many ornamental dwarf, semi-dwarf, weeping and variegated forms have been obtained.

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Related references

Waxman S., 1975: Witches broom sources of new and interesting dwarf forms of picea abies pinus spp and tsuga canadensis. Acta Horticulturae (Wageningen) 54: 25-32

Grasso, V., 1969: Dwarf seedlings from witches' brooms of Pinus halepensis. Witches' brooms are said by most authors to be attributable to mutations. The shoots, needles, cones and seeds collected from a witches' broom on a P. halepensis tree near Bari were all smaller than those from normal branches. Seed from...

Waxman S., 1985: The development of new forms of dwarf conifers obtained from witches brooms. Hortscience 20(2): 190

Tovar, G.; Mayorga, M.; Rendon, G.; Cifuentes, C.; Prieto, J.; Ortiz, M., 1991: Witches' brooms of cocoa on the Piedemonte plains, Colombia: dynamics of witches' brooms production and the latent period. Investigations of 5-, 7- and 12-year-old cocoa hybrid plantations showed that removal of witches brooms [Crinipellis perniciosa] by pruning gave good disease control.

Wood, A.R.; Scholler, M., 2005: Uromyces euryopsidicola sp. nov., a rust species that forms witches' brooms on Euryops (Asteraceae) in South Africa. U. euryopsidicola sp. nov. (Uredinales) is described from South Africa. The species is microcyclic, forming telia on stems of Euryops spp. (Asteraceae, Senecioneae). It is systemic, inducing the development of witches' brooms in its hosts.

Waxman, S., 1987: Dwarf conifers from witches-brooms. Combined proceedings International Plant Propagators' Society6(36): 131-137

Fordham, Alfred J., 1967: Dwarf conifers from witches'-brooms. Seeds from white pine infected with witches' broom were collected and germinated. Forty eight percent of the seedlings showed dwarfness. Cones in the witches' -broom retain their seeds longer than the normal white pine cones which usuall...

Johnson A.G.; Pauley S.S.; Cromell W.H., 1968: Pine g dwarf segregates from witches brooms. Proceedings of the Central States Forest Tree Improvement Conference 6: 16-18

Johnson, A.G.; Pauley, S.S.; Cromell, W.H., 1968: Pine dwarf segregates from witches'-brooms. Plants raised from seed on witches' brooms of Pinus banksiana, P. strobus, P. resinosa and P. clausa comprised normal and dwarf segregates with highly significant height differences. There were also differences between the progenies of differ...

Fordham, A., 1966: Dwarf White Pines from witches'-brooms. Describes, with illustrations, some examples of witches' brooms on Pinus strobus, and discusses their cone abnormalities and the characteristics of seedlings raised from seed from witches' brooms.