Tree Fruit Growers, Watch Out For Fire Blight

Recent warm temperatures mean blooms are opening across the Northwest, and the recent rains over the weekend, and the forecast calling for showers Wednesday and Thursday, Washington State University is warning tree fruit growers of the risk of fire blight.

WSU noted growers that reported fire blight last year need to pay close attention.  Temperature Risk Values above 150 are considered high, with anything over 350 are extreme.  Some warmer areas, like Yakima, are already seeing elevated risk, while cooler spots remain lower.

And WSU stressed even dew can create enough moisture for infection during bloom.

If Fire Blight Was An Issue Last Year, Be On Your Toes This Spring

Fire blight thrives in warm, wet conditions; especially above seventy degrees—allowing bacteria to spread into blossoms.  WSU is reminding growers to make a plan now to be ready to prevent fire blight in the orchard.

WSU said its important to think about which are the high-risk blocks: blocks with sensitive varieties, high value varieties or a history of fire blight. Those are blocks where owners or managers may want a more intensive program.

WSU also stresses to consider how different each season can be.  Have a plan for moderate temperatures and extended bloom as well as flash bloom.  Remember if temperatures are warm and wet risk is high.

In the event temperatures are cool and conditions are dry, WSU says managers may not need to manage blight. For more from WSU on addressing fire blight, Click Here.

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