With all the cool temperatures we have had this spring, most growers are planning to start sweeping next week (week of May 8). Sweeping this week only resulted in a very few weevil and many collembola/springtails (not a cranberry pest, but very abundant on bogs in many colors) – see attached pic. Coming next week, tiny blackheaded fireworm larvae of the most concern...
Cranberry IPM Message
Leaf Nutrient Analysis. If you want to plan fertilizer decisions based on leaf tissue tests, it is time to start thinking about scheduling collection of tissue samples, The best time to take samples is between August 15 and September 15. Samples should be collected particularly if a deficiency is suspected.
Current conditions are prime for seeing yellow vine syndrome symptoms, which are typically expressed when vines are under stress, usually from heat or water imbalances. There is not much to do at this point except to monitor soil moisture and irrigate regularly as needed. See photo for example of leaf symptoms.
We recommend scouting for Putnam scale now.
Nearly all growers have applied their 2 Altacors for cranberry fruitworm If you think you had a big flight of Sparganothis or have a history of trouble, an Intrepid or Invertid would be well timed next week. Delegate...
IPM Message
As per the label, first application of the most of the commonly used registered copper products (eg.
Fruitworm season has begun with hybrids sprayed already. Check your bog to see if 50% out of bloom is reached to trigger a spray, while waiting a week after 50% out of bloom for Howes. Varieties are wildly different. For example, a Scarlet Knight bed with sandy bog floor was 100% out of bloom this week with all berries whereas a Steven was at 20%.
Now is the time to get your initial numbers for percent out-of-bloom for cranberry fruitworm management. It is good to get 1-2 calculations in before you hit 50% oob, so you can be a bit more confident in your numbers. On June 23, we had BL at 19% oob, Dem and CQ at 17% at State Bog.
Most migratory honey beekeepers have started to deploy their hives this week. Commercial bumblebee quads arrived last week. This signals the stop order for Avaunt, Actara and Diazinon applications. Many growers treated for scale with Diazinon on 6/10 with the incredible low wind conditions and early release of crawlers.
Pheromone traps to monitor for Spag, BHF, and/or cranberry girdler, should be up. Photos to aid identification of the moths are in last week’s message on the website. Sparganothis moths are flying. If you are going to use Intrepid or Altacor to manage 2nd generation, applications would go on 3 weeks after onset of flight (end of June) and 10-14 days later.
