. Biology of rust resistance in forest trees : proceedings of a NATO-IUFRO advanced study institute, August 17-24, 1969. Trees; Pine; Trees; Rust diseases. 492 E. P. VAN ARSDEL VAN ARSDEL: I think that probably you are right; the fungus needs nitrogen, and is higher in protein than the hose material. At least, those rodents that chew on cankers all the time are after something. I think they are after protein nutrition (or nitrogen). It shouldn't be too difficult to analyze but I haven't done it. WEISSENBERG: In discussing the question of potential hazard areas for blister rust, the Mediterrane
. Biology of rust resistance in forest trees : proceedings of a NATO-IUFRO advanced study institute, August 17-24, 1969. Trees; Pine; Trees; Rust diseases. 492 E. P. VAN ARSDEL VAN ARSDEL: I think that probably you are right; the fungus needs nitrogen, and is higher in protein than the hose material. At least, those rodents that chew on cankers all the time are after something. I think they are after protein nutrition (or nitrogen). It shouldn't be too difficult to analyze but I haven't done it. WEISSENBERG: In discussing the question of potential hazard areas for blister rust, the Mediterranean countries have been mentioned. Miss Emma Vecchi de Pellati mentioned at the FAO 2nd World Consultation on Forest Genetics that the white pine blister rust has not occurred in Italy although they have both the alternate host and P. gviffithii (syn. P. walliahiana) and P. strobus. And Prof. Vidacovic mentioned that the rust does not occur in Yugoslavia. I would like to know whether these areas can at all be considered potential hazard areas. They might have both hosts occurring sympatrically but the climate might not be suitable for the total life cycle of the rust. VAN ARSDEL: Spaulding showed quite a gradation across Europe in his paper of 1929 on conditions of rust in Europe. Harm has been done, I think, to research work in the Forest Service, because people that went to Switzerland were told by a Swiss forester that the rust wasn't very serious. "We grow P. strobus and we get rust but it never hurts ; Yugo- slavia is in a warm climatic zone and I don't think you could grow the rust in it if you wanted to, anymore than you could in southwest Texas, Ohio, or Indiana. I haven't explained the mechanism of what happens after a little rust gets into an area. Warmer weather is required for urediospores to make a secondary spread after the initial ribes infections from a few cankers on pines. They spread rapidly from ribes leaf to ribes leaf, defoliating th
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Keywords: ., bookauthoruni, bookcentury1900, booksubjectpine, booksubjecttrees
