Thorough monitoring must continue until potential lesions from the last primary infection period have had enough time to appear. You should not cut back on your fungicide program until you have fully assessed the effectiveness of your primary scab fungicide program. Approximate Number of Days Required for Lesions to Appear at Different Average Temperatures Aver. As of May 18, we had reached 103 DD from May 4. If you have had similar temperatures, you should start to see blossom blight symptoms in your orchard over the next week if infection did take place during bloom.
Infected blossoms look water-soaked and darker green.
Ooze may be present as milky droplets on the surface of the infected fruit. The next issue of the Vermont Apple Newsletter will contain information on post-bloom management of fire blight. PC damage has been observed on non-sprayed fruit. As mentioned in a previous IPM Alert , a DD model can be used to better time spray applications if this insect is considered a problem in your orchard. If you have had a problem with CM, then the first spray for CM should be applied once 250 DD have accumulated from the biofix, with a second spray applied 10-14 days later.