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- Title
Heat treatment of plant propagation material for the control of fire blight.
- Authors
Keck, M.; Chartier, R.; Zislavsky, W.; Lecomte, P.; Paulin, J. P.
- Abstract
The thermal sensitivity of Erwinia amylovora was determined at 45°C and 50°. In vitro assays with eight different strains showed that thermal death times did not exceed 70min at 45° C and 50min at 50°C (95% confidence interval). Heat treatments of naturally infected apple and pear shoots were performed using a moist and a dry heat procedure. When shoots were wrapped in wet cotton cloths (wet heat) and maintained in an incubator, no bacterial growth could be detected after an incubation of 5h, at 45° C. When shoots were sealed in polyethylene bags and immersed in water (dry heat), no Erwinea amylovora could be isolated after an immersion of 3 h at 45° C. Incubation at 50°C (or 1-2 b in either condition did not eradicate the pathogen entirely. The failure rate of grafts using budwoods treated at the effective time-temperature combinations did not exceed 25%. The present investigations showed that the use of thermotherapy techniques for controlling Erwinia amylovora in propagation material of apple and pear might be possible.
- Subjects
PLANT propagation; FIRE-blight; BACTERIAL diseases of plants; ERWINIA amylovora; ENTEROBACTERIACEAE; PATHOGENIC microorganisms
- Publication
Plant Pathology, 1995, Vol 44, Issue 1, p124
- ISSN
0032-0862
- Publication type
Article
- DOI
10.1111/j.1365-3059.1995.tb02724.x