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BYD problems in winter grain

Small Grains     
March 27, 2015 by Juliet Marshall

Our winter wheat and winter barley crops have broken dormancy very early - Iíd say we are 3 - 4 weeks ahead of ďaverage" and almost all of our spring wheat is planted.

About 3 weeks ago, we started having symptoms of BYD showing in winter cereal fields. Two times in the last two weeks I have taken a tour through the southern part of the state. In most areas, 85-95% of our winter wheat fields are showing 95-100% incidence. Some are severe, and growers are removing (spraying and plowing) some of these fields and replanting spring grain or dry beans. Growth stages are tillering to jointing.

Contributing factors include unusual rains last August, high populations of aphids in the fall (especially in the corn that was green chopped), a long fall, and we have had one of the warmest winters / earliest springs on record. Full rates of insecticidal seed treatments have been ineffective due to a long warm fall and high aphid populations.

Dr. Arash Rashed and I have been wiring very hard to obtain ELISA and qPCR confirmation before sending out too many alerts to the growers. I did send an alert March 16th, but didnít want to do another until we had proof positive - double - that what we were seeing was totally accurate. It is so widespread that even I was questioning myself. It is EVERYWHERE - from Parma to Idaho Falls and Ririe.

We also have severe drought conditions, which makes mitigation more difficult and damage potentially more severe. Many growers will not be able to apply irrigation for another 1-3 weeks.

We have virus in wheat, barley, timothy and field borders, roadsides, ditch banks, and farmyard grasses.I expect greater than 30% losses, in some fields greater than 60% losses. Winter malt barley fields will not make malt. Many winter wheat fields will have to go for feed.

Click on the link(s) below for more information about this pest:

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Barley Yellow Dwarf Virus in Winter Wheat

Small Grains     Treasure Valley - Idaho
Canyon county, Idaho
March 20, 2015 by Olga Walsh

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Onion thrips on volunteer onions

Onion     Treasure Valley - All
March 17, 2015 by Stuart Reitz

Onion thrips are present on volunteer onions that have resprouted from last year's onion fields. Both adult and immature thrips are present.

Volunteer onions can serve as a reservoir for thrips and Iris yellow spot virus to infest nearby onion fields. Control of volunteer onions may help to reduce thrips and Iris yellow spot pressure this season.

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