The Eleventh Regional Wheat Workshop For Eastern ... - Cimmyt

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Survey ofweed community structure - KefYalew et at. Another aspect of loss reflected due to weeds involves that of market price of produce. Fanners carrying wheat grain infested with weed seed always get on average 30% less price than those fanners carrying clean seed. This has direct relation with the type of weed management that farmers exercise. New weed problems. Farmers were asked if they came across new weed species or if weeds that had not been important had recently become so. Accordingly, 42.3% of the fanners interviewed responded 'no' while 57.7% responded 'yes'. Of the 57.7% responded 'yes' 28.9% identified Bromus pectinatus, 5.9% Argemone mexicana and 2% Polygonum convolvulus. The rest identified weed species like Phalaris minor, Galium spurium and Guizotia scabra as new weed problems in their area. CONCLUSIONS AND RECOMMENDATIONS In the current survey, the following conclusions and recommendations can be drawn for researchers, extension workers and fanners. • The survey has documented th~ species and their relative importance in wheat. • The data from current survey is the first of its kind in the surveyed area; therefore, the data can be used in the future to detennine the impact of crop management and other factors on the weed species composition and community structure. • The first eight major weeds with high mean density and dominance are Polygonum nepalense, Phalaris minor, Bromus pectinatus, Galium spurium, Guizotia scabra, Galinsoga parvijlora, Cotula abyssinica, Anagallis arvensis. • Since the major weed species are limited in number, designing an effective weed management strategy for the surveyed area should be relatively simple. • Fanners and development workers should give due attention to new problem weeds before they become difficult for management. REFERENCES ARDU. 1982. Report on surveys and experiments carried out in 1980. 'Plant Husbandry department. Asella, Ethiopia: ARDD. Dale, M.R.T. and A.G. Thomas. 1987. The structure of Saskatchewan fields. Weed Sci. 35:348-355. Frick, B. and A.F. Thomas. 1992. Weed surveys in different tillage systems in southeastern Ontario field crops. Can. J. Plant Sci. 72:1337-1347. Giref Sahile and Workiye Tilahun. 1997. Results of a weed survey in the southeastern wheat plain of Asasa woreda. Arem 2&3: 100-102. Hidalgo, B., M. Saavedra and L. Garcia-Torres. 1990. Weed flora of dryland crops in the Cordoba region (Spain). Weed Res. 30:309-318. Kedir Nefo, Feyissa Tadesse and Tilahun Geleto. 1999. Results of weed surveys in the major barley and wheat growing areas of the Bale highlands. In: Fasil Reda and D.G. Tanner (eds.). Arem 5:85-95. EWSS, Addis Ababa. McCully, K.Y., M.G. Sampson and A.K. Watson. 1991. Weed survey of Nova Scotia lowbush Blueberry (Vaccinium angustifolium) fields. Weed Sci. 39:180-185. Naavas, M.L. 1991. Using plant population biology in weed research: A strategy to improve weed management. Weed Res. 31:171-179. Saavedra, M., L. Garcia-Torres, E. Herrnandez-Bermejo and B. Hidalgo. 1990. Influence of environmental factors on the weed flora in crops in the Guadalguivir valley. Weed Res. 30: 363-374. Swanton, C.J., D.R. Clements and D.A. Derksen. 1993. Weed succession under conservation tillage: A hierarchical framework for research and management. Weed Techno!. 7:286-297. Taye Tessema and Yohannes Lemma. 1998. Qualitative and quantitative determination of weeds in tef in west Shewa zone. In: Fasil Reda and D.G. Tanner (eds.). Arem 4: 46-60. EWSS, Addis Ababa. 297
Survey ofweed community stntcture - Kefyalew et al. Taye Tessema, Yohannes Lemma and Belayneh Admasu. 1999. Qualitative and quantitative determination of weed occurrence in wheat in west Shewa zone of Ethiopia. pp. 160-172. In: CIMMYT. The Tenth Regional Wheat Workshop for Eastern, Central and Southem Africa. Addis Ababa, Ethiopia: CIMMYT. Thomas, A.F. and M.R.T. Dale. 1991. Weed community structure in spring seeded crops in Manitoba. Canadian l. of Plant Science 71: 1069-1080. Thomas, A.G. 1985. Weed survey system used in Saskatchewan for cereal and oilseed crops. Weed Sci. 33:34 43. Thomas, A.G., and l.A. Ivany. 1990. The weed flora of Prince Edward Island cereal fields. Weed Sci. 38: 119 124. Zanin, A.B.G., G. Baldoni, C. Grignani, M. Mazzoncini, P. Montemurro, F. Tei, C. Vazzana and P. Viggiani. 1992. Frequency distribution of weed counts and applicability of a sequential sampling method to integrated weed management. Weed Res. 32:39-44. 298
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The Eleventh Regional Wheat Worksh
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CIMMYT® (www.cimmyt.cgiar.org) is
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Table a/Contents 105 Developing whe
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Table o/Contents 366 Delayed nitrog
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e>..... I Countries participating i
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Welcome on behalfo/CIMMYT Board a/T
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Welcome on behalfofCIMMYTBoard ofTr
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CIMMYT'S NE\V APPROACH TO ADDRESS W
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CIMMYT's Global Project 5 - Pfeiffe
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SOURCES OF VARIATION FOR GRAIN YIEL
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Sources ojvariation Jar grain yield
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Sources ofvariation for grain yield
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Germplasm enhancement through molec
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Germplasm enhancement through moiec
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Gennplasm enhancement through molec
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Germplasm enhancement through molec
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QUALITY OF ETHIOPIAN DURUM WHEAT CU
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Quality ofEthiopian durum wheat cul
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On-farm demonstration ofimproved du
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On-farm demonstration ofimproved du
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Identification o/Ethiopian wheat cu
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Identification ofEthiopian wheat cu
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Identification ojEthiopian wheat cu
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GENETIC IMPROVEMENT IN GRAIN YIELD
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Genetic improvement in wheat grain
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Genetic improvement in wheat grain
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(;p.np.tir. imnrovp.mp.nl in WhP.fl
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Increasing yield potential for marg
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Increasing yield potentialfor margi
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Increasing yield potentialfor margi
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BREAD WHEAT YIELD STABILITY ANI) EN
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Bread wheat yield stability and env
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Milling and baking quality ofEthiop
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Response ofbread wheat genotypes to
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Response o/bread wheat genotypes to
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Developing wheat varieties for drou
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MILLING AND BAKING QUALITY OF SOUT
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Milling and baking quality ofSouth
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Milling and baking quality ofSouth
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Milling and baking quality ofSou th
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Response o/wheat genotypes to sowin
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Response ofwheat genotypes to sowin
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Mixtures offour wheat cultivars in
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Mixtures offour wheat cuttivars in
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THE ASSESSMENT AND SIGNIFICANCE OF
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Assessment a/pathogenic variability
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Assessment o/pathogenic variability
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Assessment ofpathogenic variability
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Assessment a/pathogenic variability
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SOURCES AND GENETIC BASIS OF VARIAB
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Sources ofvariability ofgenes for y
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PERFORMANCE OF FOUR NEW LEAF RUST R
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Performance offour new leafrust res
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HOST RANGE OF WHEAT STEM RUST IN ET
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Host range ofwheat stem rnst in Eth
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STABILITY OF STEM RUST RESISTANCE
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Stability ofstem rust resistance in
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Stability ofstem rust resistance in
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Field response o/bread wheat genoty
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Field response ofbread wheat genoty
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Field response a/bread wheat genoty
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Necessary to app~y insecticides to
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Necessary to apply insecticides to
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Necessary to apply insecticides to
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RUSSIAN WHEAT APHID RESISTANT WHEAT
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Integrated control using Russian wh
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Integrated control using Russian wh
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Development oflinear equations for
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BREEDING FOR DISEASE RESISTANCE IN
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Breeding f or disease resistance in
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Breedingfor disease resistance in w
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Breedingfor disease resistance in w
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SPATIAL TOOLS FOR WHEAT RESEARCH I
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Spatial tools for wheat research -
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Spatial toolsjor wheat research - H
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Response ofsome durum wheat landrac
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Response a/some durum wheat landrac
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Agronomic and economic evaluation o
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Page 255 and 256: Agronomic and economic evaluation o
Page 263 and 264: Effects ofsoil waterlogging on conc
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Page 273 and 274: EFFECT OF CROP ROTATION AND FERTILI
Page 275 and 276: Effect ofcrop rotation andfertilize
Page 277 and 278: Effect ofcrop rotation and fertiliz
Page 283 and 284: Effect ofcrop rotation andfertilize
Page 285 and 286: Effects oftillage and cropping sequ
Page 301 and 302: Survey ofweed community structure -
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Page 311 and 312: EVALUATION OF HERBICIDES FOR THE CO
Page 313 and 314: Evaluation ofherbicides for the con
Page 319 and 320: Effects ofsurface drainage methods
Page 325 and 326: CROP ROTATION EFFECTS ON GRAIN YIEL
Page 327 and 328: Crop rotation effects on grain yiel
Page 335 and 336: Impact ofcropping sequence and fert
Page 345 and 346: THE INTRODUCTION OF DISEASE AND PES
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Page 351 and 352: Reducing mechanical harvesting loss
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Effects ofcrop rotation, tillage me
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Effects ofcrop rotation, tillage me
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ON-FARM EVALUATION OF THE RESPONSE
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Response offour bread wheat varieti
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TIMING NITROGEN APPLICATION TO ENHA
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Timing N application to enhance whe
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Timing N application to enhance whe
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DELAYED NITROGEN APPLICATION AND LA
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Delayed N application and late till
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RESPONSE OF WEED INFESTATION AND GR
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Response ofweed infestation and gra
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FARMER PARTICIPATORY EVALUATION OF
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Farmer participatory evaluation ofb
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Farmer participatory evaluation o/b
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Client oriented research approach t
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Client oriented research approach t
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Economics offertilizer use on durum
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Economics oJJertilizer use on durom
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On-farm analysis ofdurum wheat prod
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A study o/the adoption o/bread whea
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A study ofthe adoption ofbread whea
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Eleventh Regional Wheat Workshop Pa
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