IPM MESSAGES 2013 You can also call in to 508.295.2212 ext. 60.

Historical Messages: | 2012 | 2011 | 2010  |   2009  |  2008  |  2007  |  2006  | 2005  | 2004

Quick Links to 2013 IPM Messages:

IPM Message May 20, 2013

Insect populations continue to be low. However, now is the time to sweep!

Winter moth larvae are easily seen in sweep nets at this time. Populations are not nearly as high as expected this year, but it would be wise to check your own bog. Small gypsy moth, false army worm and even black-headed fireworm have been reported on bogs.

Cranberry weevil are active at this point and some pockets over threshold (4.5/25 sweeps) have been found. Remember, grey weevils found in the sweeps should not be counted as they are not a cranberry pest. Avaunt is a good choice if you have both winter moth or other larvae and weevil. If weevil is not in the mix, Delegate is a good choice for the worm pests, as is Intrepid.

Dodder seedlings are germinated everywhere, we are reaching the end of the window for pre-emergence sprays for dodder. Quinstar is now fully registered for both pre- and post-emergence control of dodder. Many handler restrictions are in place for this compound, so make sure of your handler's requirements before using. Also note that the allowed MAXIMUM RATE on the label is 8 oz. per acre per application with a maximum of two applications [the old Section 8 label allowed up to 12 oz. per application - the new label does NOT].

The window for pre-emergence management of other weeds is over. If the weeds are up, time early post-emergence Callisto applications in the next two weeks or so. This material requires 4 hours to be rain fast.

Frost continues to be a concern with all cultivars advanced to at least bud elongation stage. The tolerance for all cultivars is 29.5 degrees Fahrenheit. Click here to see growth stages and frost tolerances.

Since we have reached bud break, we reaching the end of the window for fungicide treatments for upright dieback If you had this disease in 2012, consider an application of fungicide following the recommendations in the Chart Book.

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IPM Message May 6-8, 2013

Winter moth larvae were picked up in sweeps last week. There is only a small window of opportunity to get out and sweep this week before the poor weather conditions come in, so try to get out there to see if winter moth is on your bog. Growers were picking up averages of 8-10 larvae last week. They are very small but you should be able to see them. At this size, it is hard to tell if they are WM, black-headed fireworm or Spag, but most likely, they are WM. Avaunt is a good choice along with Delegate and Intrepid.

Cranberry weevils have been swept in the past few days, but not in numbers to trigger a spray. Grey weevils have also been picked up, but these weevils do not eat cranberry.

Dodder seedlings have been reported inland over the weekend (May 4). Scout in the duff layer for emerging seedlings; you do not need to dig into the soil to find the seedlings. Plan herbicide treatments for about 2 weeks after early seedling emergence. Day-old seedlings were noted in Onset on May 8. Photo below shows single dodder seedling (probably several days old) on duff layer.

The first frost warning was issued on April 16. Most growers have been out frost protecting almost every night since then as we have had 16 warnings. Protecting started earlier in the night for typical spring time protection such that we already have as many "pump hours" as we did all of last year. Click here to see the most recent growth stages and frost tolerances.

We are past the window for applying preemergence herbicides in all but the coldest of locations. It is probably too early to be applying Callisto or other postemergence herbicides but if you are in a warm location and the weeds are up, you could be in the window. Callisto needs about 4 hours to become rainfast. Most growers should probably wait until next week before applying any early Callisto sprays.

We are looking for sites to study POISON IVY. If you would be willing to help us out, please call extension 21 or 27. We will be testing combinations of Poast and Callisto (so no crop-destruct). We are also looking for DODDER sites where we can use QUINSTAR. We are getting desperate, so if you are cleared for using QuinStar and have dodder and would be willing to help us out, please call extension 21 or 27.


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