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Cranberry IPM Message

Timely application of management strategies with consistent monitoring of bloom is very critical to achieve the best fruit quality. Bloom monitoring is also important if any of your handler chemical usage restrictions are associated with bloom progression. In the past two weeks, bloom is progressing at a quicker pace.

We had one report last week of what we believe is Funky Flower.  The pathogen is unknown but thought to possibly be a soymovirus.  The flowers are distorted, usually a vibrant pink color; it causes vegetative...

Although there is much more activity at the station this summer compared to last summer, the Station is still closed to outside visitors, as per university guidelines.  We are still available to receive samples and we are permitted to travel off-site to your bogs.  If you wish to visit with staff member, please contact us ahead of time to make arrangements.  The University is planning to fully...

First fungicides should be going on this week on most varieties.  Some growers sprayed Mullicas and Crimsons last week.  Bees on “in” just about everywhere.  Don’t forget to check your pheromone traps and record your numbers.

Bloom is here and as you are getting ready for fruit rot fungicide applications, here are important things to keep in mind.

Spag (sparganothis fruitworm) is starting to show up.  Larvae can be found in loosestrife tips (see photos below, courtesy Marty Sylvia) and cupped cranberry tips.  Pheromone traps reportedly already have caught some moths, so once again, it’s a difficult, spread-out population.  Intrepid, Invertid, or Delegate now or later are your options.

Sprays have been going out to manage green spanworm and cranberry weevil. Avaunt has been very effective in most cases, but reports of lower efficacy have been heard.

Buds are pushing out of elongation and even into roughneck at some locations.

As of May 12, we had 24 possible frost nights; 8 were called as dangerous and 7 as possible.  9 nights had no frost predicted. The recent string of frost nights may contribute to waterlogged areas on the bog, so improving (managing) drainage is very important. Proper soil drainage results in optimal aeration of roots, healthy vines and improved fertilizer use efficacy.

There have been reports from early scouting of very small larvae; they are likely green spanworm or winter moth. It is very hard to tell them apart when they are so small.  We have also had reports of weevil, but mostly on edges near the woods.  We would not recommend spraying right now anyway for high weevil numbers.

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