R: winter hardiness of Nic29 /M9: The common problem in the inland Pacific Northwest isn't often from classic, low temperature winter damage. Our more common problems with the M9 clones comes from sudden "cold snaps" in the fall. The trunks of younger trees on M9 seem slower to develop tolerance for low temperatures in the fall. The latest cold snap was in late November 2010, when regional temperatures stayed up in the 55-60F highs and 45F lows for the weeks before diving down to 8 to18F below zero in 2 days. This did a lot of trunk damage in some orchards, and we are still seeing effects in some orchards. The rootstocks weren't injured at all, and many of them sent up a fringe of collar suckers in response to the trunk injury.
One rootstock that sometimes will die from the cold the first few winters, with no cold damage to the scion, is EMLA 106. They become much hardier with age. I believe I have misidentified winter damage as Phytophthora collar rot a few times in orchards on 106. Tim Smith WSU Does anyone have any experience with the winter hardiness of M9-Nic29 rootstock? _______________________________________________ apple-crop mailing list apple-crop@virtualorchard.net<mailto:apple-crop@virtualorchard.net> http://virtualorchard.net/mailman/listinfo/apple-crop _______________________________________________ apple-crop mailing list apple-crop@virtualorchard.net<mailto:apple-crop@virtualorchard.net> http://virtualorchard.net/mailman/listinfo/apple-crop Vincent Philion, agr., M.Sc. Microbiologiste/Phytopathologiste (pomiculture) Institut de recherche et de développement en agro-environnement Research and Development Institute for the Agri-Environment www.irda.qc.ca<http://www.irda.qc.ca> Centre de recherche 335, Rang des Vingt-Cinq Est Saint-Bruno-de-Montarville (Québec) J3V 0G7 vincent.phil...@irda.qc.ca<mailto:vincent.phil...@irda.qc.ca> Bureau: 450 653-7368<tel:450%20653-7368> poste 350 Cellulaire: 514-623-8275<tel:514-623-8275> Skype: VENTURIA Télécopie: 450 653-1927<tel:450%20653-1927> Verger expérimental 330, Rang des vingt-cinq Est Saint-Bruno-de-Montarville (Québec) J3V 4P6 Téléphone et télécopieur : 450 653-8375<tel:450%20653-8375> Local pesticide: 450-653-7608<tel:450-653-7608> Pour nous trouver, cliquer sur le lien: Laboratoire<http://maps.google.ca/maps/place?cid=9609486867104665866&q=irda+pfi&hl=fr&sll=45.557814,-73.360476&sspn=8.87586,1.961403&ie=UTF8&ll=45.557814,-73.360476&spn=0,0&z=16> Verger<http://maps.google.ca/maps/place?cid=11405391288824931904&q=verger+irda&hl=fr&sll=45.54961,-73.350585&sspn=0.012504,0.018389&ie=UTF8&ll=45.54961,-73.350585&spn=0,0&z=16> Fiers héritiers du travail des frères Saint-Gabriel: http://arboretum8gabrielis.wordpress.com _______________________________________________ apple-crop mailing list apple-crop@virtualorchard.net<mailto:apple-crop@virtualorchard.net> http://virtualorchard.net/mailman/listinfo/apple-crop
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