One potato psyllid detected in Canyon County potato field
Among the approximately 90 fields are being monitored only with yellow sticky cards in cooperation with several crop consultants, one potato psyllid was found on a card in Canyon County last week. This psyllid will be tested for Lso, the bacterium that causes zebra chip.
Results to date of sticky card captures from the ca. 90 fields being monitored with yellow sticky cards can be found at the link below.
https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdHc2TVpneVJoeGk0ZDRIaHJQajhDVUE#gid=0
Weekly update summaries will be extended to stakeholders; however, to obtain the most up-to-date information on trap captures, this website can be checked at any time for periodic updates over the week.
A spreadsheet detailing results from the 13 fields being monitored using sticky cards, vacuum samples, and leaf samples will be posted soon. So far no psyllids have been detected from these sites.
More information and resources on potato psyllids and zebra chip can be found at the link below.
Click on the link(s) below for more information about this pest:
- https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdHc2TVpneVJoeGk0ZDRIaHJQajhDVUE#gid=0
- http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/
No potato psyllids detected in Idaho potatoes yet
The University of Idaho, in collaboration with Miller Research and several crop consultants across the state initiated a scouting program during the week of May 13 that covers commercial potato fields throughout southern Idaho. The project is funded in part by ISDA and IPC. Thirteen fields are being monitored with 10 yellow sticky cards, vacuum samples, and leaf samples. Approximately 90 additional fields are being monitored with 4 yellow sticky cards. Thus far, no potato psyllids have been found in any samples from potato fields.
More information and resources on potato psyllids and zebra chip can be found at the link below.
Click on the link(s) below for more information about this pest:
Cereal Disease Update
Stripe rust continues to spread in Brundage and is showing up in other susceptible winter wheat varieties such as Garland hard red winter wheat. Given the current weather, the widespread nature of stripe rust in southern and eastern Idaho, and the forecast for the next week, stripe rust will start to show up in our spring wheat fields, especially the susceptible varieties.
Many winter wheat fields are past legal application of fungicides, based on growth stage and pre-harvest application (PHI) index. Please follow label directions. For fields still within the window of application, the most susceptible varieties (based on reaction to previous 2011 races) include:
Hard winter wheat:
susceptible - Deloris, DW, Boundary, Garland, Golden Spike, Moreland, Whetstone, Yellowstone, Weston, Promontory, Juniper.
Soft white winter:
susceptible - Brundage, AP Legacy, AP Badger, WB 470, Lambert, Goetze, WB528 ("slow rusting"), Agripro Legion and Salute.
This list is by no means totally inclusive. Many of the winter wheat fields, especially towards the Magic Valley and Burley areas, are past the application window (50% heading or 30 days PHI depending on fungicide used).
For the spring wheats, keep an eye on the most susceptible varieties, which include hard wheats WB 936, UI Winchester, Klasic, Snow Crest, Bullseye, Kelse, Jerome, Jefferson, Kronos (durum), WB-Idamax, and WB-Paloma. In the soft spring wheat varieties, keep an eye on Jubilee, Alpowa, Cataldo, Penawawa, and Nick. High-temperature, adult plant resistance (HTAP) should be kicking in with varieties such as Alturas and UI Pettit, but again, please scout and never assume the environmental conditions are sufficient to sustain any initiated HTAP.
Scout resistant varieties as well - never assume stripe rust won't change virulence patterns.
IN ADDITION TO stripe rust, other problems that are surfacing include Cereal Leaf beetle. Damage has been reportedly significant in the areas south and west of Blackfoot. A great reference for CLB is the University of Idaho's Current Information Series #994 (CIS994) found at http://www.cals.uidaho.edu/edComm/pdf/CIS/CIS0994.pdf This reference puts the economic threshold for insecticide application at 3 larvae per plant or 3 eggs per plant or both BEFORE boot, or after boot growth stage, 1 larvae per flag leaf. There are many pesticides listed for CLB control in the 2013 PNW Insect Management Handbook http://pnwhandbooks.org/insect/ .
Now is the time to consider preventative action for our spring grain for control of FHB. Spring grain is fast approaching heading, with some of our earliest varieties like Klasic hard white showing awns and ear emergence. ESPECIALLY if you have planted spring grains following corn, consider application of one of three effective fungicides: Prosaro, Caramba or Proline. Conditions are favorable for FHB infection, especially with these storms! For wheat, application should be at 50% flowering. For barley, application will be at early head emergence. Internet references for FHB in small grains include http://msuextension.org/publications/AgandNaturalResources/MT200806AG.pdf (Mary Burrows at Montana State) and http://www.ag.ndsu.edu/pubs/plantsci/smgrains/pp804.pdf (Marcia McMullen at NDSU).
Winter wheat and winter barley diseases that are showing up: Barley Yellow Dwarf Virus, Wheat Streak Mosaic Virus (dry land areas), Eyespot (straw breaker foot rot), environmental damage associated with freezing temperatures.
Spring diseases that have started to show up - so far, black chaff in wheat (Xanthomonas) is just beginning. CURRENT weather is CONDUCIVE for continued development of black chaff in wheat and bacterial blight in barley (both caused by Xanthomonas bacteria. NO fungicides will control Xanthomonas).
Also, damage from Cereal Cyst Nematode is occurring in the sandy soils around Rexburg and Sugar City.
No potato psyllids detected in Idaho potatoes so far
The University of Idaho, in collaboration with Miller Research and several crop consultants across the state initiated a scouting program during the week of May 13 that covers commercial potato fields throughout southern Idaho. The project is funded in part by ISDA and IPC. Thirteen fields are being monitored with 10 yellow sticky cards, vacuum samples, and leaf samples. Approximately 90 additional fields are being monitored with 4 yellow sticky cards; scouting efforts in some fields (especially in eastern Idaho) are still being initiated. Thus far, no potato psyllids have been found in any samples from potato fields; however, this week one adult potato psyllid and numerous psyllid eggs were observed on bittersweet nightshade in Twin Falls. This is not surprising given the apparent ability of psyllids to overwinter in association with this alternative host plant. Next week we will provide access to an online spreadsheet that shows results of the potato field monitoring efforts and location of fields (by county).
More information and resources on potato psyllids and zebra chip can be found at the link below.
Click on the link(s) below for more information about this pest:
Additional stripe rust reports
Additional reports of stripe rust in wheat are coming in from Aberdeen, American Falls and the Pocatello area. Chad Jackson (University of Idaho) reported stripe rust in Brundage in the border of research plots on the Research station. Brad Clayson and Ron Ellis report stripe rust on the Fort Hall reservation and near Pocatello and American Falls. Additional reports continue from the Magic Valley. Most reports are of stripe rust in Brundage. If you find stripe rust in other varieties, please let me know. Again, further information is available on our website.
Click on the link(s) below for more information about this pest:
Stripe Rust Update
Stripe rust has been reported in Northern Idaho by Doug Finkelnburg in the soft white winter variety 'Brundage' on the University of Idaho's research farm in Moscow, ID. Stripe rust is also confirmed in southern Idaho from the Twin Falls / Filer areas (also in Brundage) and in Declo (also in Brundage). If you are growing a susceptible variety, please scout and spray with fungicides as needed. While visiting fields in the Twin Falls area, many fields (approximately 30%) of winter wheat and winter barley were infected with BYDV. Most of the fields of winter wheat were Stephens. What appeared to be a resistant reaction to stripe rust was visible on many of the flag leaves of Stephens. Please don't assume resistance with be maintained in varieties reported as resistant, as changes can and do occur in the race structure of the stripe rust fungi. Please check our website for additional information, pictures, and fungicide efficacy chart.
Click on the link(s) below for more information about this pest:
