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Forestry 1971 44(1):81-86; doi:10.1093/forestry/44.1.81
© 1971 by Institute of Chartered Foresters
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EDITORIAL

A Study of Some Factors of Resistance of Pinus sylvestris L. to Peridermium pint (Pers.) Lev.

TITUS W. OLEMBO 1

Department of Forestry University of Aberdeen, Scotland

External needle extracts from an infected and a healthyPinus sylvestris L. did not adversely affect the germination of aeciospores of Peridermium pini (Pers.) Lev.Internal extracts and juices expressed from needles and shoots showed a fungistatic effect on spores.

The effect was more pronounced when extracts and juices were derived from needles of a healthy tree than from an infected one. In the former case, the germ tubes were invariably deformed. The significance of these differences in relation to resistance is discussed.


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