Forages, Cereals
Cold Damage to alfalfa-http://www.uwex.edu/ces/forage/pubs/frost_damage_to_alfalfa.htm
Stripe Rust Update
April 9, 2008
Xianming Chen
Stripe rust in eastern Washington
Spring is taking baby steps to come to the Pacific Northwest. The Palouse region in eastern Washington, especially the Pullman Campus of Washington State University, received several inches of snow on April 8 and 9.
I was checking wheat fields in the Horse Heaven Hills area, south of Tri-Cities and the Connell area in central Washington on April 8. Plants of winter wheat ranged from FS stage 2 to 5. Plant stands were not uniform in most fields, which might be due to the lack of moisture in the last fall. There was no winter kill observed.
Stripe rust was just shown up in the Horse Heaven Hills area and in relatively low incidence compared the rust situation this time of last year. Actually, I found stripe rust only in one of numerous fields checked. One spot had 4 to 6 low leaves with actively sporulating rust pustules and a couple of unrelated leaves with small infected patches just starting sporulation. There was no rust found in the Connell area. The low rust incidence and severity are due to the relatively low temperature so far. As the weather is predicted to warm up next week, stripe rust will develop in these areas. Growers in these areas should check their fields in two weeks, and consider using fungicides when rust incidence and severity reach 5 to 10%.
Yesterday, I also found powdery mildew in a couple of fields, one was the same field with stripe rust in the Horse Heaven Hills and another in the Connell area. Powdery mildew was on low leaves and was easier to found than stripe rust. Generally, powdery mildew is not a problem in these areas without irrigation.
Stripe rust in western Washington
As usual, stripe rust is severe in the Mt. Vernon in the Skagit Valley, western Washington. By April 3, stripe rust reached 100% prevalence and 50% severity on susceptible entries in our experimental nurseries. Similar levels of rust severities in commercial fields planted with susceptible varieties. Growers in the Skagit Valley should consider use of fungicides whenever machinery can be operated in the fields. Two applications of fungicides with longer duration of effect may be necessary to protect wheat crops. The last spray should be close to FS 10.5 to protect the grain filling stage.
Stripe rust in other states
So far, stripe rust has been reported in Texas, Louisiana, Arkansas, Georgia, and California. In General, the disease is in low levels, except stripe rust has developed quickly in north part of the Sancremental valley.
Upcoming events
2008 PNW Small Grain Research Tours Schedule and be found at the following website: http://variety.wsu.edu/Updates/FieldTours2008.pdf.
Forage producers needs survey-
Area Extension Educator Phil Petersen is currently conducting a needs survey of area growers, consultants, and the forage industry to determine the program areas for the Farages, Agronomy and Farming Systems program for Franklin/Benton counties. The survey can be found by clicking on the word "survey". Please print the form fill it out and submit it to the address listed on the survey form.
Please click on the below links for further information:
Alfalfa and Alfalfa Seed Production
Forage Grasses
Small Grains
Washington State Fertilizer Guides
For more information please contact:
Phil J Petersen, Ph.D.
Area Extension Educator
Forages, Agronomy, & Farming Systems
1016 N. 4th Avenue
Pasco, WA 99301-2130
509-545-3511
Fax 509-545-2130
phil_petersen@wsu.edu
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