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IPM Message for Cranberry Growers: July 8, 2022

IPM Message
July 8, 2022

As per the label, first application of the most of the commonly used registered copper products (eg. Badge® SC, Champ® Formula 2 Flowable, Champ® WG, Kocide® 3000, Kocide® 2000, Mastercop®, Blulogic) for cranberry fruit rot management are recommended for late bloom. Additional applications may be applied at 7-14 days intervals.

If you choose to use Mastercop please note that there was a typing mistake associated with Mastercop rate in Chart Book 2021-2023 on pg. 20. Correct rate for a single application is 3 pts/acre (NOT 3-9 pts/acre) starting from late bloom and can be applied up to 3 times at 10-14 day intervals with a maximum recommended total annual rate of 9 pts/A.

If you have a bog or a section of the bog diagnosed with phytophthora root rot, after improving drainage, ideal time to apply fungicides (foliar application of phosphonates or soil application of phenylamides) is when soil temperatures are conducive for root development and pathogen multiplication (June, July and August).

We are in the middle of Cranberry fruitworm season! During bloom, Altacor is the compound of choice for fruitworm management. Two shots at 4.5 oz, 10-12 days apart.  Intrepid and Delegate should be planned for in a few weeks as spag eggs start hatching.  Summer generation Cranberry weevil is unfortunately showing up on some bogs. You cannot manage weevil until the bloom is gone and the bees have been removed. The threshold for summer weevil is 9 and Actara is only option unless you are doing domestic fruit, then you could use Fanfare (45 day phi, very hi aquatic tox).

Now is a good time to put out grass herbicides, especially if targeting Poverty grass.  Look to make sure new growth is appearing.  When using any of the grass herbicides, always add an NIS 1-4 pt/A. Concentrated Callisto sprays can injure dodder stems when applied before the dodder flowers and is a good option.  It is not too late to apply concentrated Callisto on Poison Ivy.  We find best control if done twice in a single year and then repeated twice in the following year.