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IPM Message for Cranberry Growers: Jun 3, 2010

Jun 3, 2010

Bees are coming out onto the bogs so exercise caution with all pesticide sprays.  We have had reports of more than 100 BHF moths caught in a trap.  Intrepid is pollinator safe but it is Zone 2 restricted.  Be sure to check the Chart Book to make sure you are waiting the proper intervals between sprays and observing the correct water holding times as needed.  If using Intrepid or Confirm for BHF, apply 2 weeks after the onset of moth flight.  If using these products for Spag, apply 3 weeks after the onset of moth flight.  Timing with conventional insecticides is 10 days after peak for BHF and 10-14 days after peak for Spag.

Some growers have applied their first fungicide spray during this past week.  Frank recommends applying at about 10% bloom.  Walk your bog and take note (by counting) the actual number of open blooms.  It often appears that more bloom are open than actually are. This would cause you to overestimate 10% bloom and you may be applying too early.  The varieties are at very different stages at this point and bogs vary a lot by location, so examine all of your pieces.

We do not recommend mixing Callisto with Bravo.  The manufacturers of Callisto inform me that the sticker in Bravo will impede penetration of the herbicide into the leaf and reduce its effectiveness.  In general, it has been fine to mix Callisto with Poast, but we have had a report of injury associated with this mixture.  Growers have successfully mixed Intrepid and Bravo.  Please let me know what your experiences have been with these or other combinations.

Upright injury following tank-mix backpack application of Callisto and Poast with an NIS (Act 90)  on cv. Randall. Injury is typical of that seen with Callisto alone.
 

Upright injury following tank-mix backpack application of Callisto and Poast with an NIS (Act 90) 
on cv. Randall. Injury is typical of that seen with Callisto alone.

If you would like any specific issues or questions to be addressed on the IPM message, call me at ext 21 or email me hsandler@umass.edu.