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Powdery Mildew in Hops
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Posted on: July 23, 2001 by Jerry Neufeld
Hop Powdery mildew continues to spread to hop fields in southwestern Idaho. Current weather conditions in this area continue to favor the growth, reproduction, and spread of hop powdery mildew. In addition, most of the hop acres in Canyon County are planted to powdery mildew-susceptible varieties. Fields of Zeus hops are highly susceptible and should be treated prophylactically with a protectant fungicide. As more acres of Zeus become infected, Galena, Willamette and Chinook hops may need to be treated as well. It is imperative to check hop yards at least once per week to determine the level of powdery mildew and to assess the effectiveness of treatments. Information provided by Jim Barbour from the U of Idaho, Parma Research and Extension Center.
Powdery Mildew Control Failure in Hops
Hops none
Posted on: July 9, 2001 by Jerry Neufeld
The Washington Hop Commission has reported failure of Flint to control Powdery Mildew in Hop fields owned by different growers. We do not know the reason for these control failures. However, Flint is a strobilurin and fungicides based on this chemistry can be very susceptible to the development of resistance. Remember to rotate Flint (and other Strobilurins) with DMI's (Folicur or Rally) and/or products with other chemistries/modes of action such as Serenade, sulfur, & oils.
Powdery Mildew In Hops
Hops none
Posted on: June 27, 2001 by Jerry Neufeld
Jim Barbour, U of Idaho Specialist at Parma reports powdery mildew was found on hops in Canyon Co. The infected plants were in a field of Zeus hops that had been infected with powdery mildew last year.
This is the first time that an Idaho hop field has been found with powdery mildew two consecutive years. The cool dry weather we have been having lately is ideal for the powdery mildew fungus. Growers should scout fields of susceptible hops once weekly and treat immediately if powdery mildew is found.
