Inheritance of Pear Decline Resistance
DOI:
https://doi.org/10.71318/apom.1976.30.2.63Abstract
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 pyricolaFoers.) (1). Williams et al (3) showed that, based on phloem necrosis folowing psylla feeding, Pyrus communisL., P. betulaefoliaBunge, P. calleryanaDene., P. ussuriensisMax cv. Chieh Li and P. pyrifoliaMak. cv. Japanese Golden Russet were quite resistant to decline, while wild P. pyrifoliaand cultivars 'Hawaii', 'Nijiseiki' and 'Mikado', and wild P. usuriensiswere susceptible. This is in general agreement with long term field studies of pear decline (2).
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