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Factors influencing infection of mechanical wounds by Fusarium circinatum on Monterey pines ( Pinus radiata )
Author(s) -
Sakamoto J. M.,
Gordon T. R.
Publication year - 2006
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.2005.01310.x
Subject(s) - pinus radiata , radiata , biology , inoculation , canker , spore , botany , horticulture , vigna
Pitch canker, caused by the fungus Fusarium circinatum , is a disease affecting many pine tree species. In California, Pinus radiata (Monterey pine) is the principal pine host affected by pitch canker. This investigation into factors affecting infection frequency by F. circinatum of P. radiata examined the influence of: (i) wound size; (ii) relative humidity; (iii) time of inoculation; (iv) inoculum density; and (v) wound age. Wounded branches sustained significantly more infections when large‐diameter (1·6 mm) rather than small‐diameter (0·5 mm) wounds were made. Infection frequencies tended to be higher at 100% RH than at ambient humidity, although these differences were not statistically significant. Infection frequencies were significantly higher on branches inoculated after 17·00 h than on branches inoculated before noon. Infection frequencies were significantly higher for wounded branches spray‐inoculated with 5 × 10 7 rather than 1 × 10 7 spores mL −1 . Infection frequencies of pruning wounds declined as wounds aged.