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92 Table 1. Comparison between some selected populations and their subsequent parent populations. ICARDA score 3 5 7 9 Populations 114x 7 7 11 2 2.2 b cc31 11 6 17 2.1 b 15x 66 32 14 3 1.6 a Parents I14x 3 9 3 4.0 d c¢3l 2 4 1 2.7 c 15x I 5 3 6 3.8 cd After these tests the resistance of each cultivar can be defined from its components and characteristics and its stability can be estimated. Results until now indicate that the resistance selected possesses many HR traits (quantitative, polygenic, slowing down of epidemic), which permits some optimism as far as the stability of the resistance is concerned. Reference VAN DER PLANCK, J.E. 1968. Disease resistance in plants. Academic Press, N.Y. 206 pp. Discussion H.C.Weltzien In your list of screening methods you have no method to screen for lower sporulation rates or decreased spore vitality. Is there any reason for this? R.Pieters The main reason has been the lack of time, but I think that these characteristics should be studied, because they are important factors in the development of an epiphytotic. J.B.Smithson What is the reason for including hair density among the tests for horizontal resistance?
R.Pieters Malic acid is known to have an effect on the germination of Ascochyta spores. This acid is produced in the glandular hairs 'on the leaves. The correlation of hair density with resistance is probably caused by the increased concentration of malic acid on leaf surfaces with many hairs. T.S.Sandhu Are there any techniques available with which we can deal both with vertical and horizontal resistance at the same time in our breeding program, as vertical resistance masks the expression of horizontal resistance? R.Pieters I know of no method to assess the level of horizontal resistance in the presence of active vertical resistance. M.V.Reddy In order to identify the most relevant criteria, we are looking into the various disease reactions of the lines found resistant across locations which are supposed to have HR, and we hope to come up with a criterion or a set of criteria related with HR. G.C.Hawtin In the data you presented two of the parents were fairly highly resistant. How can you then separate vertical from horizontal resistance in the subsequent generations following crossing between these resistant lines? R.Pieters To avoid introduction of vertical resistance genes a variety will only be accepted as parent when it possesses following resistance characteristics: (i) quantitativity, (<strong>ii</strong>) no gene for gene action, and (<strong>ii</strong>i) effect on the develoment of epidemic. Selections resulting from crosses between approved parents are checked for above mentioned characteristics again. On top of that, number of their resistance genes is estimated by crossing with an ultimate susceptible. The chance that vertical resistance will not be detected and eliminated in the described process seems to be small. G.C.Hawtin From your data and presentation I got the impression that you consider more than one locus to be involved in resistance. Can you comment further on this please? R.Pieters There is evidence that indeed more loci involving resistance exist. Specific crossing programs are carried out at the moment to identify these loci. 93
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A14 ""..."W~e S~wn ofCh all il NM I
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WORLD CROPS: PRODUCTION, UTILIZATIO
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Copyright (c) 1984 by ICARDA All ri
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VI THIRD SESSION: WINTER SOWING Agr
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Foreword The advancing of sowing da
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Editors' Note The idea to hold this
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Chairman, Ladies and Gentlemen, Ope
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4 including stunt virus (pea leaf r
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6 in with Iarmers'plans and proposa
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8 about 130 to over 200 days, where
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10 Table I Mean yield and range of
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12 International Yield Trials A 10-
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14 small plots on farmers' fields i
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16 HANOUNIK, S.B. 1979. Diseases of
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18 diospores (Khune and Kapoor 1980
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20 2. Reproduction Asexual. The ase
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22 surface. However, the fungus los
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24 observed small reddish brown spo
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26 Reddy and Nene (1979) developed
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28 suggested the application of pot
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30 ASKEROV, I.B. 1968. Ascochytosis
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32 NEMLIENKO, F.E. and LUKASHEVICH,
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Proceedings ofthe Workshop on Ascoc
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100/ ILC 1929 90 -80./ 8o0 / ILC
Page 49 and 50: 30 24 18 12 6 Temperature (°C) t6
Page 51 and 52: I I -I - --ii ' Disase Ic I ii I'll
Page 53 and 54: infected seed is a much more potent
Page 55 and 56: Proceedingsof the Workshop on Ascoc
Page 57 and 58: early February were found to give e
Page 59 and 60: pot assembly consists of a stem tha
Page 61 and 62: Table I A quantitative 9-point rati
Page 63 and 64: inoculating the plants by uniformly
Page 65 and 66: Proceedings ofthe Workshopon Ascoch
Page 67 and 68: Table I Cultural characteristics of
Page 69 and 70: Line/ Table 2 Disease grades produc
Page 71 and 72: India and Iran were highly sporulat
Page 73 and 74: LUTHRA, J.C. and BEDI K.S. 1932. So
Page 75 and 76: J.S. Grewal There are more chances
Page 77 and 78: 68 Table I Summary of results of sc
Page 79 and 80: 70 Table 3 Summary of results of sc
Page 81 and 82: 72 ery originated from the USSR, Sp
Page 83 and 84: Table 7. Contd. Rating on 1-9 Scale
Page 85 and 86: Table 8 Contd. Rating on 1-9 Scale
Page 87 and 88: Table 9. Contd. Entry Origin Rating
Page 89 and 90: Table 10 Differential reaction of s
Page 91 and 92: 82 1069, 1467, 1591 were found resi
Page 93 and 94: 84 ing of the remaining collections
Page 95 and 96: 86 AUJLA, S.S. 1964. Study of eleve
Page 97 and 98: Proceedings ofthe Workshop on Ascac
Page 99: Parents diallel cross F1 diallel cr
Page 103 and 104: 96 (Hawtin and Singh 1983). Asv.-,h
Page 105 and 106: 98 3. Identification of as many sou
Page 107 and 108: 100 Germ. Evaluation Disease Res. M
Page 109 and 110: 102 Robinson (1976) has further dev
Page 111 and 112: 104 and by the time a multilinc cul
Page 113 and 114: 106 lines will then be made availab
Page 115 and 116: 108 GILL, K.S., NANDA, G.S., SINGH,
Page 117 and 118: 110 the program for the development
Page 119 and 120: 112 where they are not present. See
Page 121 and 122: 114 cides have been found to be eff
Page 123 and 124: 116 indicates that this propagate i
Page 125 and 126: 118 Great care must be exercised in
Page 127 and 128: 120 nature. Ascochyta propagules on
Page 129 and 130: 122 ZACHOS, D.G., PANAGOPOULOS, C.G
Page 131 and 132: 124 0 40 g30 Max 30 20. .,,10 Min ,
Page 133 and 134: 126 ranged from November 22, 1978 t
Page 135 and 136: 128 Genotypes Table 2 Grain yield o
Page 137 and 138: 130 Response to Plant Population Th
Page 139 and 140: 132 ILC 1929 at Tel Hadya and ILC 4
Page 141 and 142: 134 Data in Tab. 5 emphasize the im
Page 143 and 144: 136 appears adequate, therefore no
Page 145 and 146: 138 Discussion F. EI-Sayed I am ass
Page 147 and 148: Proceedings of the Workshop on Asco
Page 149 and 150: Table I The timing of reproductive
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Table 3 Accumulated water use by sp
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Es x (1 - a) x Eo t where t is the
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BRIDA cm Water /Depth Interva', 3 4
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crops extended deeper than under wi
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(as at Jindiress), the winter-sown
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eduction in the size of the crop's
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Discussion G.C. Hawtin You raised a
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Table I Nodutation and total drymat
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162 Inoculation with single strain
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164 These results indicate that pho
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166 T.S. Sandhu Is there any techni
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168 April for Tal Abaid (36*42'N, 3
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170 At the end of the severe cold p
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172 Table 4 Origin of lines having
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174 stage (Tab. 6). Of the five cul
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176 HERZOG, H. 1978. Wachsturnsverh
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Proeedings of the Workshop on Ascoc
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There is little information availab
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of the major and minor pests in thi
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attack any other important crop pla
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KAY, D.E. 1979. Food Legumes - Crop
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190 On the other hand, two items th
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192 M.V. Reddy It looks as if the c
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Country World ICARDA region Algeria
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196 Table 2a Export of chickpeas by
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198 India, Saudi Arabia, Venezuela
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Proceedings ofthe Workshop on Ascoc
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Chickpea Cultivation 203 In Syria m
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Table 2 Comparison of the growth, s
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Proceedings of the Workshop on Asco
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Excessive postharvest losses. Posth
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Seedbed preparation is very minimal
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carried out at the same time with w
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Table 4 Topographical classificatio
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were absorbed by the canning indust
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223 The advantages of winter sowing
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226 cultivars which could be plante
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Table 2 Area, production and yicld
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233 Threshing is mostly done by bul
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182, 192,'194,1069, 1772,3279,2380,
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238 4. Mycosphaerella pinodes and A
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240 Kausar (1960) discussed the rea
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242 Date Tale 2 Maximum temperature
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244 Table 4 Maximum temperature and
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soil moisture and therefore it is a
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Table 2 Characteristics of chickpea
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253 Table 5 Results of a trial on w
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Conclusion Chickpea in Tunisia has
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260 however, remained almost static
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262 Agricultural Universities and s
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264 greatest at flowering and fruit
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266 Basis of Resistance Kunzru and
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268 Discussion M. Aslain What is yo
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270 vars. It was assumed that the d
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Proceedings of the Workshop an Asco
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0- 400 ha ® Em 401 -1000 ha 1001 -
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277 Castille and even (1500 kg/ha)
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Table 3 'Rabia' attacks - environme
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would be pure extension. Diffusion
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284 7. The role of crop debris as a
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286 involving only a few treatments
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288 MAKKOUK, Khalid, Faculty of Agr
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