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DISEASE MANAGEMENT IN RATOON RICE 2134. Diseased ratoon tillers regenerated from stubbles with stem rot.Table 3. Bacterial blight incidence and intensity on main crop and ratoon crop ofIR56 in the screenhouse, IRRI, 1985 dry season.StrainMain crop aIncidence (%) Severity (%)Ratoon crop bIncidence (%)IRN 724IRN 741IRN 729IRN 731IRN 699IRN 700IRN 720IRN 717IRN 734IRN 705PXO 61IRN 736IRN 733PXO 86IRN 73067.064.256.154.554.053.749.048.543.741.437.935.533.533.324.127.526.326.422.421.919.727.617.118.619.113.917.317.417.910.88.711.311.38.74.716.020.712.02.03.07.310.713.312.010.0a Mean of 9 scores at 3 replications/strain taken at weekly Intervals from 11-49d after Inoculation. b Mean of 3 replications/strain taken about 1 mo after harvest.
214 RICE RATOONINGAlthough the intensity was not high enough to kill the ratoon tillers, grain yield wasreduced. The data also provide evidence that inoculum of the bacterial pathogenmay be generated from ratoon tillers and stubble to infect a subsequent crop.MAIN CROP DISEASE CONTROL AND RATOONINGInitial field observation has shown that diseases in the main rice crop usually affectratooning and the kinds of diseases that occur on the ratoon crop. The effects ofdiseases caused by Rhizoctonia solani and Sclerotium oryzae were not always clear.In the 1980 wet season, the effect of main crop disease management onratooning of IR32 was studied. This cultivar is known to be resistant to some of themajor rice diseases of the Philippines: blast, tungro, grassy stunt, ragged stunt, andbacterial blight. A fungicide mixture of benomyl-thiram was applied at differentstages of rice growth (Table 4, 5). At harvest, rice stubble was cut about 15 cm high.Ratoon rating was at 35 d after ratooning.Table 4. Chemical control of main crop and ratoon rice disease development onratoon crop of IR32, IRRI, 1980.Disease incidence b (%)Time of fungicide application a Main crop Ratoon cropSH SR YD SH SR YDSeedlingMaximum tilleringFillingSeedling + maximum tilleringSeedling + fillingMaximum tiliering + fillingAll three stagesCheck11.735.018.326.726.78.38.312.384868380596160850000000044.152.138.338.543.517.619.743.1747671727372667422.619.421.217.013.020.818.024.4a Benomyl-thiram (20% ai.i.) at 1 g/liter H 2 O. b SH = sheath blight, SR = stem rot,YD = yellow dwarf.Table 5. Effect of fungicide application on stem rot infection of main rice crop and ratoon cropdevelopment.Main cropRatoon cropTime of fungicide application a Stem rot Yield Tillers/hill (no.) Ratoon b Yield(%) (t/ha) rating (t/ha)Basal Nodal TotalSeedlingMaximum tilieringFillingSeedling + maximum tilleringSeedling + fillingMaximum tillering + fillingAll three stragesCheck84868380596160858.1 a7.8 a7.7 a6.7 a7.4 a7.5 a8.3 b7.3 a10.1 a12.0 a10.5 a11.5 a12.2 a12.0 a11.4 a10.2 e8.1 abc6.4 bc6.2 bc5.6 c8.8 ab8.5 abc10.0 a7.0 bc18.218.416.717.121.020.521.417.20.80 bc0.77 c0.74 c0.77 c0.85 bc1.00 ab1.07 a0.72 c1.3 ab1.4 ab1.3 ab1.5 ab1.6 ab1.6 ab1.8 a1.2 ba Benomyl-thiram. b MH TRatoon rating = 1 – × tT × (1 – 0.1 × V), where 16 = av no. of tillersh 16/hill, MH = missing hills, T h = total no. of hills, T t = total number of tillers (nodal + basal), V =vigor rating: 1 = extra vigorous, 5 = intermediate, 9 = weak.
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RICERATOONING1988INTERNATIONAL RICE
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ContentsForewordWelcome 1OverviewRi
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Genetics and varietal improvementIn
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2 RICE RATOONINGthe main crop. Harv
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4 RICE RATOONINGTable 1. Area, prod
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6 RICE RATOONINGTable 2. Rice varie
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8 RICE RATOONING1. Effect of spacin
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10 RICE RATOONINGHowever, no signif
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12 RICE RATOONINGrelating to seed v
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14 RICE RATOONING5. Cultivars that
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Economic perspectivesof rice ratoon
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ECONOMIC PERSPECTIVES OF RICE RATOO
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32 RICE RATOONINGla) Developmental
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34 RICE RATOONINGCutting heightStub
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36 RICE RATOONINGEarly flooding enc
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38 RICE RATOONING2. Factors affecti
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40 RICE RATOONING27. Nair, N.R., an
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42 RICE RATOONING1. Changes in till
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44 RICE RATOONINGTable 2. Character
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46 RICE RATOONING9. International R
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48 RICE RATOONINGplot size is 6 row
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50 RICE RATOONINGimproved ratooning
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52 RICE RATOONINGTable 6. Simple co
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Utilization of rice ratooningby far
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RICE RATOONING IN RIO DE JANEIRO 57
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RICE RATOONING IN RIO DE JANEIRO 59
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Rice ratooningin the Dominican Repu
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RICE RATOONING IN THE DOMINICAN REP
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89111306514772Special points Refere
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72 RICE RATOONINGANDHRA PRADESHBasu
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74 RICE RATOONINGrice observed at t
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76 RICE RATOONINGTAMIL NADUBalasubr
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78 RICE RATOONING19. Reddy, T.G., M
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80 RICE RATOONING1. Rice-growing re
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82 RICE RATOONING2. High cutting he
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84 RICE RATOONINGTable 3. Yield tri
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Rice ratoon crop managementin the h
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RICE RATOON CROP MANAGEMENT IN KARN
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23123722821721922222421423122421722
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98 RICE RATOONING1. The Tungabhadra
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100 RICE RATOONINGthe results of po
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102 RICE RATOONINGTable 4. Effect o
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Ratoon rice researchin Karnataka, I
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RATOON RICE RESEARCH IN KARNATAKA 1
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RATOON RICE RESEARCH IN KARNATAKA 1
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112 RICE RATOONINGTable 1. Area and
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114 RICE RATOONINGonly 7.5-49.7% of
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116 RICE RATOONINGTable 5. Relation
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Scope for rice ratoon croppingin th
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RATOON CROPPING IN NORTHEASTERN IND
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Scope for rice ratoon croppingin th
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RATOON CROPPING IN CENTRAL AND NORT
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RATOON CROPPING IN CENTRAL AND NORT
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Potential of rice ratooningin Madag
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RICE RATOONING IN MADAGASCAR 131a.
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RICE RATOONING IN MADAGASCAR 133Tab
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Potential for rice ratooningin east
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RICE RATOONING IN EASTERN INDIA 137
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Ratooning in Bangladesh:prospects a
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RATOONING IN BANGLADESH 145RATOON C
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RATOONING IN BANGLADESH 147Table 4.
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RATOONING IN BANGLADESH 149OTHER FA
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152 RICE RATOONINGTable 1. Hybrid s
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154 RICE RATOONINGThe studies sugge
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156 RICE RATOONINGVARIETIES AND CUL
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158 RICE RATOONINGspikelet primordi
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160 RICE RATOONINGTable 5. Effect o
Page 170 and 171: Agronomic principles and practiceso
Page 172 and 173: AGRONOMIC PRINCIPLES AND PRACTICES
Page 184 and 185: Rice ratooning: breeding,agronomic
Page 186 and 187: BREEDING, AGRONOMIC PRACTICES, AND
Page 192: BREEDING, AGRONOMIC PRACTICES, AND
Page 195 and 196: 188 RICE RATOONINGwas the most effe
Page 197 and 198: 190 RICE RATOONINGRESULTSMain crop
Page 199 and 200: 192 RICE RATOONINGRatoon tiller reg
Page 201 and 202: 194 RICE RATOONING9. Rister, M. E.,
Page 203 and 204: 196 RICE RATOONINGExcept for rice w
Page 205 and 206: 198 RICE RATOONINGInsect survivorsh
Page 207 and 208: 200 RICE RATOONING1. Stem borer occ
Page 209 and 210: 202 RICE RATOONING3. Population dyn
Page 211 and 212: 204 RICE RATOONING2, 3). Microvelia
Page 213 and 214: 206 RICE RATOONINGplant chemicals a
Page 215 and 216: 208 RICE RATOONING17. Krishnamurthy
Page 217 and 218: 210 RICE RATOONING1. Yellow dwarf c
Page 219: 212 RICE RATOONING3. The effect of
Page 223 and 224: 216 RICE RATOONINGTable 6. Sheath b
Page 226 and 227: Yellow dwarf disease in ratoon rice
Page 228 and 229: YELLOW DWARF DISEASE IN RATOON RICE
Page 230 and 231: YELLOW DWARF DISEASE IN RATOON RICE
Page 232: YELLOW DWARF DISEASE IN RATOON RICE
Page 235 and 236: 228 RICE RATOONINGTable 1. Estimate
Page 237 and 238: Main crop a Ratoon crop b53.956.155
Page 240 and 241: Disease and insect pestsand their c
Page 242 and 243: DISEASE AND INSECT PESTS IN RICE RA
Page 244 and 245: DISEASE AND INSECT PESTS IN RICE RA
Page 246 and 247: Inheritance of ratooning abilityin
Page 248 and 249: INHERITANCE OF RATOONING ABILITY IN
Page 250 and 251: INHERITANCE OF RATOONING ABILITY IN
Page 252: INHERITANCE OF RATOONING ABILITY IN
Page 255 and 256: 248 RICE RATOONINGShould the season
Page 257 and 258: 250 RICE RATOONINGYield and yield-c
Page 259 and 260: 252 RICE RATOONINGMain-crop photosy
Page 261 and 262: 254 RICE RATOONINGShort-termGiven t
Page 264 and 265: Commercial ratoon rice productionin
Page 266 and 267: COMMERCIAL RATOON RICE PRODUCTION I
Page 268 and 269: COMMERCIAL RATOON RICE PRODUCTION I
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COMMERCIAL RATOON RICE PRODUCTION I
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0.180.200.490.250.160.270.390.350.3
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268 RICE RATOONING1. Path analysis
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270 RICE RATOONINGRecommendationsVa
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ParticipantsT. AhmedRice Experiment
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Varietal indexA200, 221Achra 108/1,
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VARIETAL INDEX 277IR2061-465-1, 12I
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VARIETAL INDEX 279RU7502006, 49, 51
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