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IPM Message for Cranberry Growers: Jul 25, 2014

July 25, 2014

If it has been more than 1 week since your last fruitworm spray, you should be checking fruit for unhatched viable eggs. Do not exceed 19.5 oz per acre per season for Delegate. If you are sweeping, you may see cranberry weevil and flea beetles. Belay can be used but only if the bees are gone as it is highly toxic. Check for handler restrictions for this and other insecticides! If you want to treat for grubs (Admire or similar products), now is the time to make your applications.

You are permitted only 2 applications of Callisto total to the bog area. This counts whether applied by boom, chemigation or any combination of application methods. Even if you only apply 4 oz/A each time (thus staying under the 16 oz/A limit), you can only make 2 applications. If you chemigated Callisto and If a portion of your bog did not get treated for some reason (blocked head, etc) and you have weed escapes, you can spot-treat that portion of bog. You should carefully note this in your pesticide records so it does not read as 3 applications to the same piece. Callisto has a 45-day PHI. Poast has a 60-day PHI. Select has a 30-day PHI.

Treatments for fairy ring can go out until July 31. It can only be used once. Treat 3 ft beyond the advancing ring of dying vines and 2 feet within the line. Sul-Po-Mag or K-Mag can be used to help vines recover mid-August through October. Remember that Abound and Indar are considered high risk materials for resistance development; rotate other fungicides into your schedule as needed.

Dodder is definitely showing up on some bogs now. There are not many options left at this point. If the dodder is attached to weeds that are susceptible to Callisto, you can try a Callisto application. If the dodder is mainly attached to cranberry, Callisto will probably not give you the control you are looking for. If you would like to try the hand-held flame torches for dodder control (they work well but take time to treat), call Katie at x43 to see if ours are available for loan. Raking can be done to open up the canopy and allow the sunlight to get to the vines. Some growers have good techniques that marginally impact the fruit and vines. Plastic or bamboo rakes are preferred over metal rakes.