Apple scab infection March 31-April 1.

An apple scab infection period was recorded at our AREC Mar 31-Apr 1: 23 hr wet at 41 to 48° with 0.95 inches of rain. Cedar-apple rust spores were released with wetting earlier last week. During the most recent rain, quince rust spores also matured. Fruit buds now at tight cluster to open cluster stage are susceptible to quince rust. Sunday, Apr 3 was favorable for apple powdery mildew infection.