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Resistance to Megastigmus spermotrophus among different stands and seed-trees of Pseudotsuga menziesii (Mirb.) Franco

Resistance to Megastigmus spermotrophus among different stands and seed-trees of Pseudotsuga menziesii (Mirb.) Franco

Pap 2nd FAO/IUFRO World Consult. For. Tree Breed., Washington. FO-FTB-69-5/10, 3

Studies of cones collected from trees selected at random in several Belgian stands of P. menziesii in 1964 and 1968 have revealed marked differences (5-70%) in the infestation of the seeds by M. spermotrophus. These differences occur both between stands and between individual trees within a stand. On a given tree, all cones are apparently affected to about the same extent.

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