(Castanea dentata) in Ontario - Ministry of Natural Resources ...

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Recovery Strategy for the American Chestnut in Ontario the establishment of 24 demonstration sites with a total of approximately 1,300 American Chestnuts planted in southern Ontario. Ten of the 24 sites are located outside the native range of American Chestnut. Ongoing research into the potential of using hypovirulence as a biological control strategy is being conducted by Dr. C. McKeen, the Canadian Chestnut Council and Dr. G.J. Boland, University of Guelph. Naturally-occurring healing-type cankers have been observed in southern Ontario and putatively hypovirulent isolates have been recovered from these cankers and their hypovirulence has been confirmed in laboratory tests. Hypovirulent isolates of C. parasitica from Ontario were released at several locations, including an experimental site at Skunk’s Misery in Middlesex and Lambton counties. Hypovirulent isolates compatible with virulent isolates at the site were inoculated around the perimeter of cankers. Expansion of treated cankers was measured in comparison with untreated cankers 15 months after inoculation. For the first one to two years after treatment, statistical differences were detected between treated and untreated cankers and after 15 months, hypovirulent isolates were recovered from 82 percent of the treated cankers. However, visual observations three to five years after inoculation were not as encouraging and many of the treated trees had died from blight. Observations will be continued at this site to see if there are any long-term effects from these treatments. 14
Recovery Strategy for the American Chestnut in Ontario 2.0 RECOVERY 2.1 Recovery Goal To restore American Chestnut populations in Ontario to a self-sustaining state whereby natural recruitment results in the maintenance or increase of current population size throughout the species’ native range. 2.2 Protection and Recovery Objectives Table 2. Protection and recovery objectives No. Protection or Recovery Objective 1 Survey suitable habitat and/or formerly occupied habitat for American Chestnut and protect and monitor known populations within the species’ native range in Ontario. 2 Promote protection and public awareness of American Chestnut. 3 Develop and evaluate management measures to control threats. 4 Secure Ontario sources of germplasm originating from blight-free trees. 15
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(Castanea dentata) in Ontario - Ministry of Natural Resources ...

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