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Category Posts for Wamishe, Yeshi

20
Jun
2017
Rice blast alert: First confirmed report on Jupiter at green ring stage in Woodruff County
Author: Yeshi Wamishe, Extension Rice Plant Pathologist

By Yeshi Wamishe, Extension Rice Pathologist Most early planted rice in Arkansas is somewhere between green ring and panicle initiation and has started moving with the warm weather. Today (June 20, 2017), we received a report of leaf blast on medium grain rice variety Jupiter which is at half inch internode elongation in Woodruff County […]

16
Jun
2017
Start Scouting for Sheath Blight Disease as Rice Approaches Reproductive Stages
Author: Yeshi Wamishe, Extension Rice Plant Pathologist

By Yeshi Wamishe, Extension Rice Pathologist Scouting for sheath blight rice disease is recommended starting at the green ring developmental stage. Automatic application of fungicides is highly discouraged due to the potential of fungicide resistance development and nonprofitabiliy if applied in the absence or when sheath blight is below the threshold level.  Additionally, correct diagnosis […]

09
Jun
2017
It’s time to start scouting for rice blast disease
Author: Yeshi Wamishe, Extension Rice Plant Pathologist

By Yeshi Wamishe, Extension Rice Pathologist Rice blast disease can be managed by planting relatively resistant varieties in fields with a history of blast. Current commercial rice varieties grown in Arkansas range from resistant to very susceptible to blast disease (Table 1).  Planting blast-susceptible varieties in blast-prone fields can result in near 100 percent yield […]

26
May
2017
Tips for Scouting for Hydrogen Sulfide Toxicity in Rice
Author: Yeshi Wamishe, Extension Rice Plant Pathologist

By Yeshi Wasmishe, Extension Rice Pathologist; and Jarrod Hardke, Extension Rice Agronomist Healthy roots promote healthy plant growth.  Scouting for hydrogen sulfide toxicity in submerged rice is an essential practice to avoiding the risk of crop damage.  Regular scouting for hydrogen sulfide toxicity starting two to three weeks after permanent flood is established is highly […]

28
Feb
2017
Rice blast-resistant varieties: The best defense is a good offense
Author: Yeshi Wamishe, Extension Rice Plant Pathologist

By Yeshi Wamishe, Extension Rice Pathologist As we prepare to start the forthcoming season, planting fields with appropriate varieties is key to managing rice blast disease.   Rice blast disease can be well managed by planting relatively resistant varieties in fields with a history of blast. Planting blast-susceptible varieties in blast-prone fields can result in severe […]

06
Feb
2017
Fungicide resistance: an ongoing concern
Author: Yeshi Wamishe, Extension Rice Plant Pathologist

  By Yeshi Wamishe and Travis Faske, Extension Plant Pathologists   During the 2011 cropping season strobilurin-resistant isolates of Rhizoctonia solon, the causal agent of sheath blight, were confirmed in a few rice fields in Louisiana. This is the same pathogen that causes aerial blight of soybean. This was an “alert” call for Arkansas rice and soybean […]

19
Aug
2016
Rice disease update: Rain exacerbating late season pressure
Author: Yeshi Wamishe, Extension Rice Plant Pathologist

By Yeshi Wamishe, Extension Rice Pathologist Temperatures have been moderate with frequent rain in this couple of weeks.  Some rice diseases were also in progress. Sheath Blight Sheath blight still continues to move up in untreated fields likely causing some late season damage (Figure 1). You may be seeing heavy production of sclerotia by the […]

11
Aug
2016
Rice disease alert: Bacterial panicle blight and sheath blight on the upswing
Author: Yeshi Wamishe, Extension Rice Plant Pathologist

By Yeshi Wamishe, Extension Rice Pathologist After the hot and dry weather for several weeks, in the last couple of weeks we got rain without a substantial decrease in day or night temperatures. Although it appeared good for rice crop, these conditions seemed to favor the development of bacterial panicle blight and sheath blight. We already […]

22
Jul
2016
Arkansas Rice Update 7-22-16
Author: Jarrod Hardke, Rice Extension Agronomist

Arkansas Rice Update Dr. Jarrod Hardke & Dr. Yeshi Wamishe July 22, 2016  No. 2016-19                www.uaex.edu/rice Crop Progress Upon looking at oil dripping from underneath his racecar, Robert Duvall in Days of Thunder looked at the car and said, “This is not the kind of answer I’m looking […]

22
Jul
2016
Rice bacterial panicle blight: what research has taught us
Author: Yeshi Wamishe, Extension Rice Plant Pathologist

By Yeshi Wamishe, Extension Rice Pathologist and T. Gebrmariam, T. Mulaw, S. Belmar, C. Kelsey In the paradigm of plant pathology three factors are important for disease to occur. This includes the perfect alignment of a susceptible host with a virulent pathogen under favorable environment.  Some may associate environment only with weather. Sometimes, specific factors […]