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IPM Message for Cranberry Growers: May 20, 2010

May 20, 2010

The good news is that we have not yet seen any black-headed fireworm moths in our traps yet.  If you have not done so, get your pheromone traps out as soon as you can.  Stevens uprights collected yesterday are at hook.  We could see scattered bloom next week, especially if the warm weather continues.

We have had a few questions about using Callisto and Poast, together or not, and relative timing issues.  It is fine to mix these herbicides together in a tank and spray.  Just remember you cannot chemigate Poast.  So if you do a mixture, you must apply by ground equipment.  If you use both products together, the amount of surfactant (either NIS or COC) does not double.  These products are added based either on a total volume of water rate (0.25% in 30 gallons) or a per acre rate (2 pts/A).  Callisto needs 4 hr to become rainfast.  Others have asked about spraying Callisto for poison ivy.  Some growers have had good luck with this and it seems earlier is better for control.  Also applying by ground equipment or mistblower seems better than chemigating, but these are just general observations and not backed by actual comparisons.  As far as we know, there should be no issue with following a Casoron application with Callisto or vice-versa.  The bigger concern with Casoron at this point is the growth stage and variety of the cranberry vines.  Ben Lear are particularly sensitive to Casoron.

Keep in mind the potential for injury when using surfactants for any pesticide once the flowers are out.

If you would like any specific issues or questions to be address on the IPM message, call me at ext 21 or email