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OBSERVATIONS ON LEAF FALL IN THE DOUGLAS FIR WHEN INFECTED WITH RHABDOCLINE PSEUDOTSUGAE SYDOW
Author(s) -
BROWN A.B.
Publication year - 1930
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1930.tb07243.x
Subject(s) - abscission , biology , botany
S ummary .1 In the Douglas fir the abscission layers and associated tissues are laid down early in the development of the leaf. 2 The extent of development of the protective layer has no causal relationship with leaf fall. 3 Infection with R. Pseudotsugae brings about a marked decrease in the water content of infected leaves. 4 The abscission mechanism is efficient at an early stage in the life of the leaf, provided the necessary physiological conditions are present and R. Pseudotsugae is capable of providing these conditions.The author wishes to express his indebtedness to Dr Malcolm Wilson for his valuable supervision of the work and criticism of the manuscript.