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Cranberry IPM Message

If growers missed the timing on their Altacor, red berries are starting to show up.  Chasing these with very expensive Delegate is likely a bad idea as it will only hit a few of the larvae in the berries.  However, timing now with Delegate or Intrepid is rather good if you had high Sparganothis moth flight and want to hit those hatching eggs and young larvae.

Most growers are finishing up fruitworm and fungicide spraying. Altacor for fruitworm is a good choice and you should allow at least 7 days between applications, 10-14 is better. It does have a good residual but don’t take chances and possibly miss your application window. Do not exceed 9 oz/A per season.

Weevil is definitely an issue! We have heard reports of very high sweep counts. You must wait until bees are removed to spray Actara! Exirel is not a good option for weevil and certainly not at this time of year (cannot be used during bloom and is expensive).

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.