Much Mailing has been done in Ontario over the past few years. So where are we now? As we start another poinsettia season, the subject of whitefly is never far from the surface of any conversation. Control programs for whitefly have evolved considerably in the 22 years I have been working in greenhouse IPM and that evolution has never been faster than in the last four to five years. For a number of years in the late 1990s and early 2000s, growers were becoming concerned by the inconsistent levels ofcontrol they were seeing and the possibility of resistance to registered pesticides. These concerns were reinforced in early 2005 with news of the discovery in the U.S. of Q biotype silverleaf whitefly on poinsettia, and the subsequent realization in thefollowing years, that this pest was here to stay and likely to be a regular part of the poinsettia environment. Q biotype has also been documented in poinsettia in Canada and it is probably reasonable to assume that we will be dealing with "Q" every year from now on.
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