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Cereals Alert - Aphids are flying, and stripe rust may be lurking - the down side of a beautiful fall
All Crops All Locations
Barley Yellow Dwarf and Stripe rust
Posted on: October 9, 2015 by Juliet Marshall
Yes, I know most of the acres of winter wheat and winter barley are already planted. If the grain is up and wasn’t treated with an insecticidal seed treatment, it will be vulnerable to aphid infestation and Barley Yellow Dwarf Virus infection. The disease Barley Yellow Dwarf (BYD) can cause significant yield loss depending upon the weather.
If planted grain WAS treated with an insecticidal seed treatment, you may still be at risk depending on date of planting. Early planted grain may run out of protection, as seed treatment protection is limited. Please see the attached file for more information!
Be aware! Aphids ARE being found in the newly planted winter wheat! While that may be good news for us in our BYDV insecticide trial and for screening for resistance in new winter wheat varieties, it will not be good news for cereal producers.
And for more information, see the CIS 1210 available online: http://www.cals.uidaho.edu/edcomm/pdf/CIS/CIS1210.pdf
Stripe rust infection in fall planted winter wheat was confirmed in Montana by Dr. Mary Burrows (visit http://www.mtagalert.org/ ). That doesn’t mean we have fall infection as well, but it definitely indicates that we have increased risk! The beautiful fall weather allows green bridge material (volunteer grain) to become well established, providing a reservoir for disease (stripe rust especially) and insects (aphids and mites) that transmit BYDV and WSMV.
Prepare to treat your Peach and Nectarine Trees this fall
Tree Fruits All Locations
Various Peach/Nectarine Tree Fungal Diseases
Posted on: October 5, 2015 by Ariel Agenbroad
If you had confirmed cases of Shothole Disease, Peach Leaf Curl or other fungal diseases in your Peaches, Apricots and Nectarines, fall spraying can be an effective part of your protection and prevention strategy.
At about 50% leaf fall, spray an approved Copper Based Fungicide, Bordeaux Mixture or Lime Sulfur at the rate listed on the product.
For more information and specific products to use, visit the links below.
ZC-positive plants found in potato fields in Minidoka and Twin Falls counties
Potato All Locations
Posted on: October 2, 2015 by Amy Carroll
Tubers sampled from a potato field in Minidoka County and a field in Twin Falls County tested positive for liberibacter (Lso), the bacterium that causes zebra chip (ZC). So far this season we are aware of four fields in Idaho with confirmed ZC. Earlier this season we reported finding Lso-positive tubers from Ada and Power counties.
As the season winds down, we encourage growers and crop consultants to be on the lookout for symptomatic tubers.
Photos of typical ZC symptoms exhibited by foliage and tubers may be found here:
Consult our website for more information, including management recommendations and online spreadsheets that show details of the psyllid captures in potato fields over the season. http://www.uidaho.edu/extension/news/psyllid-management
Late blight found in Payette County
Potato All Locations
Posted on: October 1, 2015 by Nora Olsen
Late blight infected tubers were identified from Payette County. Foliar late blight was not previously reported in this area. The strain was identified as US-23. Continue to submit diseased tubers for sampling in all Idaho regions and counties.