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...
Cranberry IPM Message
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...
General Preemergence Herbicides. Now is the time to be applying Devrinol, Casoron, and Evital for preemergence weed control.
News on the disease and insect fronts has been quiet. It is getting to be the time to put out bud set fertilizer applications if that is part of your nutrition program.
We continue to see conditions that support that the season is running about 2 weeks ahead of average (some fruit are blushing this week). Flea beetle is out and can be controlled with Sevin and Diazinon if numbers are high. There are reports of southern red mite damage so keep an eye out for that; Nexter can be used for mite control. Sprays have been going out for cranberry fruitworm...
We continue to see conditions that support that the season is running about 2 weeks ahead of average (some fruit are blushing this week). Flea beetle is out and can be controlled with Sevin and Diazinon if numbers are high. There are reports of southern red mite damage so keep an eye out for that; Nexter can be used for mite control. Sprays have been going out for cranberry fruitworm...
Just a short message this week. Flea beetles are out. Belay, Sevin and Diazinon are good choices to control flea beetle. The Entomology lab reports that several growers have already put out sprays to control this pest. There is also some talk and concern about a third generation of blackheaded fireworm showing, so be on the look out on problem or suspect bogs.
From the Entomology Lab: Keep in mind that Belay is only being recommended for cranberry weevil; it is a better choice than Actara for weevil management. Black-headed fireworm, cranberry fruitworm and Spag are on the Belay label but will likely only suppress at the 4 oz rate.
If you are planning to spray for weevils, you should do so soon. Scout, assess, and treat; don’t wait. Reports of cranberry fruitworm pressure (in terms of unhatched, viable eggs) has been variable; some high numbers and some low. Try to use a magnifier when inspecting the calyx end of the fruit for unhatched viable eggs.
