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Cranberry IPM Message

The Ent lab reports several calls with growers reporting BHF larvae out on the bog.

Brown spanworm larvae may start to show up soon.  Look for thin, thread-like larvae on the rim of the sweep net.  Check pheromone traps weekly and change lures about every 3-4 weeks as needed.  Several of our new products like Delegate, SpinTor, Belay, and Entrust are highly toxic to bees, so spray these products when bees are not actively foraging.  Toxicity does drop once the spray dries. ...

Spag finds continue to be the hot insect topic this week.  Some second generation weevils have been picked up.  Now is also the time that you might be seeing true brown spanworms showing up as thread-like larvae on the rim of the net. 

We have had several reports this week of Spag in numbers above the action threshold (>1 per set).  Some growers have discussed waiting until sprays are needed for cranberry fruitworm to treat for Spag (to try to save money and sprays).  The Ent Lab discourages this consideration.  They recommend trying to target the first generation (which is now).  Although the larvae are getting large,...

The weather has not been cooperating as far as getting sprays out.  Wednesday was one of the best days so far and folks were out sweeping.  Reports are variable, but high counts of weevil and BHF are in.  Avaunt sprays have been going out for weevil.  Winter moth is mostly through its cycle on the bog.  If you are going to be using pheromone traps to time Spag, girdler or BHF infestations,...

The constant rain of the past week forced several growers to use short-term floods for BHF and/or dodder control.  It was actually a good scenario as temperatures were cool and the window to spray was small or nonexistent.

Dodder is definitely up and we are all hoping for a good spray window for QuinStar applications.  Dodder ranges from newly emerged to limited coiling around their first host.  QuinStar should still do a good job, even if coiling has just started.  Next week is forecasted to be unsettled as well, so when the window opens, go for it.  As I mentioned in the newsletter, it is fine to mix QuinStar...

The latest pictures for frost tolerance are available on our home page (from May 5).  Winter moth larvae are out.  The Ent Lab suggests not spraying until you have at least an average of 10 larvae per set and since they are spanworms, perhaps consider using 18 as your AT.  We have heard of one report of 40-50 larvae in a sweep, so they are out there!  Black-headed fireworm larvae are out as...

The message has not changed much since last week.  We have heard of a couple of growers that are opting to spray for winter moth.  Frost nights and windy conditions continue to postpone preemergence herbicide applications. We have not yet had dodder emerge in the buckets that we monitor by the greenhouse on State Bog, however, a few reports have come in from growers.  You should be checking...

We have had a report of dodder seedling emergence from Carver, MA.  This does seem a bit early, but you should be checking to see what is going on on your bog.  No need to panic at this point; there is time to apply QuinStar.  The weather is predicted to be unstable for the next few days.  In any case, you would want to see multiple seedlings emerging before spraying.  Dodder usually takes...

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