Altacor is the best early cranberry fruitworm management option; it should have good residual and rainfastness. Intrepid and Delegate can also be used. Current recommendations are to spray at 50% out-of-bloom for all varieties except Howes.
Cranberry IPM Message
Green spanworm moths are out flying. Do not target this stage of the life cycle for control. Cranberry fruitworm moths are also out, scouting for just the right berry. Now is the time to be planning your CFW management approach as 50% out-of-bloom won’t be that far away.
Most cranberry varieties (except Howes) are approaching 20% bloom at State Bog. This is the time to start thinking about your first fungicide application and to plan the rest of your fungicide program. Call Erika at ext 18 if you have any questions.
Reports of very high numbers of weevil have come in (for example, averages of 20 or 45). If your bees have not arrived and you do not have flowers open, you could still get in an Avaunt spray. However, Wonderful Bees has started to deliver and hybrids have started with scattered bloom! Remember it is illegal to spray Avaunt (choice for spring weevil control) when open blooms are present.
The past week has had some very cold temperatures and we have had reports of growers running for frost late last week and over the weekend. We could still have another night with very low temperatures, so be prepared to run if needed.
All LW floods should be off your bogs by now (or if on the Cape, by the end of the month). Frost tolerance is 29.5 F once the flood is removed, no matter the appearance of the buds. Sweep for early season insects and CB weevil. Generally, no fertilizer is needed on LW bogs until bloom.
Gypsy moth is still present and should be swept and managed for. Cranberry weevil is being found on many bogs at threshold and now is the time to manage this insect (Avaunt). Winter moth is wrapping up and not many are being found on bogs anymore.
The last frost tolerance check on May 9th had ST, BL, and hybrids at 29.5 F and 27 for EB and Howes. All cultivars at Rosebrook were at the bud elongation stage. Hopefully after the cold day today, we will enter at least a few days of warmer temperatures, especially at night.
Dodder has been reported in the seedling stage in Carver over the weekend. We had dodder emerge in our buckets by the greenhouse on May 3 (last week).