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IPM Message for Cranberry Growers: Jul 29, 2019

July 29, 2019

Fungicide programs should be completed by now and sprays for weevil management should be over too. If you are opting to scout for cranberry fruitworm, collect 50 berries per acre with a minimum of 200 berries per management unit.  Repeat scouting procedure every 3-4 days until August 15.  If CFW pressure is low through fruit set, it may be safe to extend your interval a little.  If numbers trigger a spray, spray ASAP. If you are treating Spag with Delegate, sprays go out 10-14 days after peak flight (may be past the window in some or most instances).

We are going through a dry period now, so monitor your soil tension to make sure you are keeping your vines well watered.  Keep the water up in your ditches if you can.

QuinStar is a good option for yellow loosestrife control, but it has a 60-day PHI and likely has handler restrictions.  Poast, used for grass control, also has a 60-day PHI.  Chlorothalonil products and Stinger have a 50-day PHI.  Callisto has a 45-day PHI. Select and Intensity (grass herbicides) have 30-day PHIs as does Roundup and Actara.

If you have patches of dodder, you can spray them with concentrated Callisto applications.  We have the SLN label on our web site under Services/Pesticide Labels. Spraying before dodder flowers is much more effective than spraying after flowers or seed are present.  Select and Intensity are good options to control poverty grass; treatment is best before the grass flowers!

If you are using fast-acting soluble fertilizer sources for the conventional cultivars, 30-40% of your N goes out at late set.

The CCCGA Summer meeting is set for August 21 at the Upland Club in Plympton. Lunch is $19 and you need to register with CCCGA by August 13.  Lunch tickets will NOT be available on the day of the event.