Construction of genetic linkage map and identification of a novel major locus for resistance to pine wood nematode in Japanese black pine (Pinus thunbergii)

Table 1 Rating scale for phenotypic assessment of PWD resistance

Phenotype	Score	Symptoms
Resistant	1	No visible symptoms
Resistant	2	Slight leaf discoloration
Susceptible	3	Severe discoloration and dry leaves
Susceptible	4	Dark-brown stem, large expanding lesions

ISSN: 1471-2229