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

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Development oflinear equations for predicting wheat rust epidemics - Mahir Answer: (1) The contradictory effect ofWS on spore counts is that the favorable condition for LR development resulted in subsequent generation of LR spores up to the end of the season which often coincides with high speed wind storms. (2) The significant effect ofWD on SR spore counts indicates the existence of a major source of SR primary (initial) inocula probably geographically located southwest ofNew HaIfa region and needs to be researched. Also, we can make use of the significant effect of WD on SR spore counts to recommend that the rust trap nursery should be on-farm from early July and that will enable us to monitor for population dynamic changes and biological variability among SR strains. Wolfgang H. Pfeiffer: Forecasting rust epidemics will depend on the varieties grown, their genetic composition in terms of resistance genes, type of resistance and temp~rature sensitivity of the resistance gene. When and how are you including these host factors into your model? Answer: Fortunately, in the Sudan, we have only two wheat varieties for large-scale commercial wheat production. But certainly we have to develop the models as the situation changes concerning genotypes. But how? Will be done in consultation with breeders and statisticians. Table 1. N " Pel-iod Partial regression coefficients for prediction of leaf rust disease. Xi "!, .. ' X2 " '. X3 : ; ""; ',,::.x;; " "'1; ,"'xs:' " ' . " X6 X7 R~ T 1 15J-311 0.55 0.22 -0.15 0.90 0.79 S 2 0.51 ** 0.11 -0.08 0.40 0.74 S 3 15J-14F 1.20*** ., 0.50* 0.32* 0.61 M 4 1.20*** 0.52* 0.16* 0.58 M 5 1F-14F -6.39 -9.80* 2.29 1.24 -3.69 0.69 S 6 -6.38* -10.20* 2.08* 1.20* -3.82* 0.68 S 7 15J-28F 1.64*** 0.51 * 0.80 L 8 1.69*** 0.47** 0.80 L 9 1F-28F 2.52*** 0.70 M 10 15F-28F 3.09** 1.29* 0.70 S 11 IF-31M 0.40 -0.43 3.78* 0.29 L 12 IF-16M 0.87** 2.61 1.10 -0.66 3.08 0.53 L 13 0.86** 2.86* 1.15* -0.65 3.06* 0.53 L 14 1M-31M -1.42 3.78* 0.52 M 15 -1.56** 4.25** 0.31 M 16 1M-16M 4.22 0.66 S 17 17M-31M -3.48 7.58 2.20* 0.84 S 18 -2.79 4.35* 2.60** 0.73 S 19 15J-31M 0.69*** 1.57 0.53 2.67* -6.04* 0.53 L 20 0.73*** 0.80 0.35 1.27 -5.75 0.51 L 21 0.84*** 1.45* -4.80* 0.50 L N = Equation no.; Period = 15 January- 31 March. Xl = progress in time; X2 = min temp; X3 = max temp; X4 = min RH; Xs = max RH; X6 = hrs RH >80%; X7 = wind speed; T= term; S= short; M= medium; L= long. *, **, *** Significant at the 5, 1 and 0.1 % levels, respectively. 203
Development oflinear equations for predicting wheat rust epidemics - Mahir Table 2. Partial regression coefficients for prediction of stem rust disease. ....... ".", ..'. "', N .· PeriOd ;":'.' Xl X2 . X3 X4. . ·· Xs ' X'6 X7 R2 . 1 22 15J-31J 3.02*** -4.69 -0.38 0.90 S 23 3.12*** -3.60 -0.08 0.80 S 24 15J-14F 1.42*** -2.95 -0.56 0.64 M 25 1.42*** -1.71 -0.77 0.59 M 26 1F-14F -5.00 0.43 S 27 15J-28F 0.34 0.73* 0.17 L 28 IF-28F -1.15* -3.04 0.40 M 29 -0.92** -2.39* 0.31 M 30 15F-28F -2.48 3.71 0.56 S 31 IF-31M -0.44** 0.39 L 32 IF-16M -0.50** 0.43 L 33 1M-31M 0.91 * -0.40* -4.53 0.52 M 34 . 0.88** -0.33*** -6.33 ** 0.49 M 35 1M-16M 1.22 -0.42 0.70 S 36 1.25** -0.31 ** 0.65 S 37 17M-31M 0.99 0.58 S 38 15J-31M -0.30 1.63 0.14 L For notes: see Table 1. , 204
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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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Page 161 and 162: PERFORMANCE OF FOUR NEW LEAF RUST R
Page 163 and 164: Performance offour new leafrust res
Page 169 and 170: HOST RANGE OF WHEAT STEM RUST IN ET
Page 171 and 172: Host range ofwheat stem rnst in Eth
Page 173 and 174: STABILITY OF STEM RUST RESISTANCE
Page 175 and 176: Stability ofstem rust resistance in
Page 177 and 178: Stability ofstem rust resistance in
Page 179 and 180: Field response o/bread wheat genoty
Page 183 and 184: Field response ofbread wheat genoty
Page 187 and 188: Field response a/bread wheat genoty
Page 193 and 194: Necessary to app~y insecticides to
Page 195 and 196: Necessary to apply insecticides to
Page 197 and 198: Necessary to apply insecticides to
Page 199 and 200: RUSSIAN WHEAT APHID RESISTANT WHEAT
Page 201 and 202: Integrated control using Russian wh
Page 203 and 204: Integrated control using Russian wh
Page 205 and 206: Development oflinear equations for
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Page 217 and 218: BREEDING FOR DISEASE RESISTANCE IN
Page 219 and 220: Breeding f or disease resistance in
Page 221 and 222: Breedingfor disease resistance in w
Page 223 and 224: Breedingfor disease resistance in w
Page 225 and 226: SPATIAL TOOLS FOR WHEAT RESEARCH I
Page 227 and 228: Spatial tools for wheat research -
Page 233 and 234: Spatial toolsjor wheat research - H
Page 239 and 240: Response ofsome durum wheat landrac
Page 241 and 242: Response a/some durum wheat landrac
Page 249 and 250: Agronomic and economic evaluation o
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Effects ofsoil waterlogging on conc
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Effects a/soil waterlogging on conc
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Effects ojsoil waterlogging on conc
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EFFECT OF CROP ROTATION AND FERTILI
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Effect ofcrop rotation andfertilize
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Effect ofcrop rotation and fertiliz
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Effect ofcrop rotation andfertilize
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Effects oftillage and cropping sequ
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Survey ofweed community structure -
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Survey ofweed community stntcture -
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EVALUATION OF HERBICIDES FOR THE CO
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Evaluation ofherbicides for the con
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Effects ofsurface drainage methods
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CROP ROTATION EFFECTS ON GRAIN YIEL
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Crop rotation effects on grain yiel
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Impact ofcropping sequence and fert
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THE INTRODUCTION OF DISEASE AND PES
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Introduction ofdisease and pest res
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Introduction ofdisease and pest res
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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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