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IPM Message for Cranberry Growers: Jul 7, 2015

July 7, 2015

Altacor and Delegate are still your best choices for cranberry fruitworm control with respect to residual and bee safety compared to Diazinon, so we recommend using those products over Diazinon.  If you are concerned about sprays going out in unstable weather pattern, Altacor should have good residual and rainfastness.  Please use the traditional cranberry fruitworm timing for Howes, spraying 7-9 days after 50% out-of-bloom.  This is still the best management strategy for this variety. 

Now is the good window to use QuinStar for yellow loosestrife control, if you can use the herbicide as per your handler. 

Dodder can be controlled with concentrated spot applications of Callisto.  It is best to apply the herbicide BEFORE dodder flowers.  Use 1-1.5 oz of Callisto per gal water plus an NIS or COC, also at 1.5 oz per gallon water.  If it’s hot and humid, use an NIS.  If it’s really hot and humid, wait until the weather breaks before applying any herbicide.  Remember you cannot exceed 8 oz Callisto per acre.  If you use 1.5 oz Callisto per gallon water, you can only treat approximately 7,600 sq ft or less than 1/5 of an acre.

Fruit set fertilizers should go out now for all varieties, if you have not already done so.  Please consider using low P options whenever possible.  The first and second numbers should be 1:1 or less, like 13-13-13 or 14-7-28.