May 1, 2012: Uganda – High severity of stem rust in both the eastern and south-west regions, yellow rust in both regions

During the period 12th January 2012 to 7th February 2012 Buginyanya ZARDI staff – W.W. Wagoire (Team Leader), A. Wasukira (Pathologist), B. Chemayek and S. Wobibi with the cooperation of field staff from the wheat growing districts, undertook a wheat rust survey in Uganda’s main wheat growing areas.   The survey route included sites in Kapchorwa, Kween and Bukwo in the east and, Kabale and Kisoro in the south west.  In the east, the wheat crop was mainly at post dough stage while in the southwest just a few fields with mature small grains could be accessed as this period did not constitute the main wheat growing season.  A total of 30 fields were surveyed using the standard BGRI survey methodology.  And all survey locations were geo-referenced using GPS. All the 16 fields surveyed in the east were bread wheat, whereas in the west of the 14 fields surveyed 5 were bread wheat, 3 Triticale, 5 barley and 1 other ( a grass). stem rust predominated, being recorded in 23 out of the 30 fields surveyed (77%) and was widespread in both the east and the south-west. High (>40%) or moderate (20-40%) severity was recorded in 11 of the fields surveyed. Compared to previous surveys undertaken in 2010 higher incidence and severity of stem rust was recorded in the eastern region. yellow rust was recorded in 10 of the 30 fields surveyed (33%), occurring in both the east and the south-west. High (>40%) or moderate (20-40%) severity of yellow rust was recorded in 6 of the fields surveyed. Similar to stem rust, higher incidence and severity of yellow rust was recorded in the eastern region compared to the previous surveys undertaken in 2010. Leaf rust was the least common rust observed on the surveys, present in only 5 fields (17%).  A total of 25 stem rust samples were collected for DNA analysis and sent to the Cereals Disease Lab, Minnesota for further analysis.

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