Volume 30 Number 2 Article 4 Pages: 63-64
Year 1976 Month 4
Title: Inheritance of Pear Decline Resistance
Author: M.N. Westwood
Citation
Abstract:
The present knowledge of pear decline disease indicates that phloem necrosis ovvurs in susceptible rootstocks of the bud union as a result of a mycoplasme whose vector is the insect pear psylla (Psylla pyricola Foers.) (1). Williams et al (3) showed that, based on phloem necrosis folowing psylla feeding, Pyrus communis L., P. betulaefolia Bunge, P. calleryana Dene., P. ussuriensis Max cv.
Chieh Li and P. pyrifolia Mak. cv.
Japanese Golden Russet were quite resistant to decline, while wild P. pyrifolia and cultivars 'Hawaii', 'Nijiseiki' and 'Mikado', and wild P. usuriensis were susceptible.
This is in general agreement with long term field studies of pear decline (2).
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