BHF, weevil, and cutworms are out. Some pests are coming in over threshold and are needing sprays for management. If you haven’t already starting scouting, you should get out as soon as possible. You may want to get your trap equipment together over the next week or so and be ready to put the pheromone traps a bit earlier than June 1 this year.
Cranberry IPM Message
The message has not changed much since last week. We have heard of a couple of growers who are opting to spray for winter moth. The string of frost nights this week has hampered herbicide applications for dodder control and other preemergence options. The growth stage of the vines continues to be very ahead of average. We continue to find emerged dodder seedlings on bogs this week and the...
The bogs continue to be more advanced than average. We found emerged dodder seedlings on a bog in Bridgewater yesterday (see photos below). This is almost 2 weeks ahead of usual, which is early May. If you are using Casoron as a preemergence control for dodder, you should plan on putting some out very soon. You may want to consider doing a 25-40 lb/A application within the next week or so...
The Entomology lab reports remarkably early emergence of insects this year. Winter moth has hatched and can be seen feeding on blueberry. Winter moth has been found on cranberry this past week at low levels. It would be wise to sweep bogs to check as soon as good weather prevails (next week hopefully). Tiny threadlike green spanworm and tiny false armyworm are also out.
We have a new fact sheet for winter moth available on the web site: Winter Moth Factsheet 2010. It has some color photographs to help aid in identification and management. With the warm weather we have been having, larvae could be emerging a bit earlier than the usual mid-late April. Eggs begin hatching in mid-April. Researchers at UMass are predicting high numbers of WM based on moth...
Things seems pretty quiet for this time of year. No unusual levels of fruit rot to report. If you have concerns about fruit rot management, please call Frank at ext.18. We have had a report of cupping of the top growth of Howes vines, possibly from QuinStar. If you have noticed any injury with QuinStar applications, please call Hilary at ext 21.
Infestations of flea beetle have been reported. Sevin and Diazinon are good choices for flea beetle. It is generally thought that populations in the range of 20-30 indicate a spray is needed, but growers should also consider their own experience. If you are not sweeping, you should go out and look for evidence of damage, especially if you have had problems in the past.
Spraganothis fruitworm larvae have been found in fruit, so you should be aware of this. If you have not taken care of your weevil infestations, it is getting to be too late for Actara. Prophlatic sprays for cranberry fruitworm should no longer be going out. You shoul only be making insecticide applications when the number of unhatched, viable eggs exceeds the action threshold.
We cannot stress enough the importance of correct timing of CFW sprays. Please see pages 14-15 in the 2009 Chart Book for exact details. Although there have been reports of weevils and BHF problems, it seems like a relatively quiet year on the whole.
IPM Message for Cranberry Growers: June 17, 2016
Bloom is coming on slowly in some areas. With mixed varieties, time the start of fungicides with the earlies. Since we are in that situation, we will be applying our first fungicide today. Our program will consist of 2 applications of Proline and the third as Bravo. All at the full rate. Recent sweeps yielded a few weevils, span worms, and large gypsy moths. None over threshold. We have...
