Predictability of pathogen host range in classical biological control of weeds: an update |
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Authors: | Jane Barton |
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Institution: | (1) Contractor to Landcare Research, 467 Rotowaro Rd, RD 1, Huntly, 3771, New Zealand |
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Abstract: | Before an exotic pathogen can be released as a classical biological control agent the likely positive and negative outcomes
of that introduction must be predicted. Host range testing is used to assess potential damage to non-target plants. To-date
28 species of fungi have been released as classical biological control agents against weeds world-wide. These pathogens have
been reported infecting only six non-target plant species outdoors and all of these incidents were predicted. Many more non-target
plant species developed disease symptoms in glasshouse tests than in the field. Consequently, data from other sources are
needed to ensure potential agents are not prematurely rejected. Predictions of pathogen host range to date have been sufficiently
accurate to prevent unpleasant surprises. Exotic pathogens are a safe and useful tool for weed control, especially in natural
areas rich in valued non-target species. |
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