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Historic, archived document Do not assume content reflects current scientific knowledge, policies, or practices. CC£2I / Lf-ffy 1 ft United States Evaluation of Department of Agriculture New Agricultural Canal Point Research Service ARS-109-1993 Sugarcane Clones November 994 1 993-94 Harvest Season 1 ~n ZrnQ wm rOrDt f >-T-. CD O.J t -0 C -< cn wt /vni | Srasete CHCittS33a&.il ABSTRACT Keywords: Daniamuck,Diatraeasaccharalis,Lauderhill muck,leafscald,Leptodictya tabida Ligyrussubtropicus, , Glaz, B.,J.M. Shine,Jr.,P.YP. Tai,J.D. Miller,C.W. Malabarsand,Melanotuscommunis,Pahokeemuck, Deren,J.C. Comstock,andO. Sosa,Jr. 1994. Evaluationof Pompanofinesand,Pucciniamelanocephala,Saccharum NewCanal PointSugarcaneClones: 1993-94 Harvest spp.,stability-safety index,sugarcaneborer,sugarcane Season.U.S. DepartmentofAgriculture, Agricultural cultivars,sugarcanegrub, sugarcane lacebug, sugarcane Research Service,ARS-109-1993,24pp. rust, sugarcanesmut, sugarcane varieties, sugarcane wireworm, sugarcaneyields,sugaryields.TerraCeia Replicatedexperimentsat9locationsrepresenting 7 soils muck,Torry muck, Ustilagoscitaminea,Xanthomonas (Dania,Lauderhill,Pahokee,TerraCeia,andTorrymucks; albilineans, yellow leafsyndrome. PompanofinesandandMalabarsand)contained28 new Canal Point(CP)clonesofsugarcane(9 in theplant-cane Whilesupplieslast, copies ofthis publication may be and first-ratooncrops,and 10in thesecond-ratooncrop). obtainedatnocostonrequestfrom USDA-ARS-SAA, Eightplant-caneexperiments included twoadditional new U.S. SugarcaneField Station,StarRoute,Box 8,Canal clones,andoneplant-caneandall first-ratoonexperiments Point,FL 33438. includedoneadditionalnewclone. Seven locations had mucksoils,andtwohad sandy soils. Twenty-sixexperi- Copiesofthispublication maybepurchasedfrom the mentscompared thecaneandsugaryieldsoftheseclones, NationalTechnical Information Service, 5285 PortRoyal VA complex hybridsofSaccharum spp., with yieldsofCP70- Road, Springfield, 22161; telephone (703)487-4650. 1133,awidelygrowncommercialcultivarin Florida. Each clone wasrated foritssusceptibility todisease. On muck soilsandon theonly sandy soilonwhich itwas tested in theplant-caneexperiments,CP89-1756yielded significantly moremetric tonsofsugarperhectare (TS/H) than CP 70-1133. CP89-1509 wasnotplantedonthe mucksoilsand wasplantedatonlyone location witha sandy soilwhereityieldedsignificantly moreTS/H than CP70-1133. Fordatacombinedacrossall first-ratoonexperiments,no clone yieldedsignificantly moreTS/HthanCP70-1133. However,CP88-1508 hadoutstanding yields attheone location with Torry muckandatoneofthetwolocations with asandy soil. CP87-1490 yielded significantlymoreTS/H thanCP70- 1133 in the second-ratoonexperiments. However,CP 87- 1490 was too susceptible toleafscaldtoberecommended forcommercialproduction inFlorida. Nootherclone from thesecond-ratoonexperiments hadaTS/Hyieldsignifi- candyhigherthan thatofCP70-1133. TheUnited States DepartmentofAgriculture(USDA) prohibits discrimination in itsprogramson thebasisof race,color, nationalorigin, sex,religion,age,disability, political beliefs,and marital orfamilial status. (Notall prohibitedbasesapply toall programs.) Persons with disabilities whorequirealternativemeans forcommunica- tionofprogram information (Braille, largeprint, audiotape, etc.)shouldcontacttheUSDAOfficeofCommunications at(202) 720-5881 (voice) or(202) 720-7808 (TDD). To fileacomplaint,writetheSecretaryofAgriculture, U.S. DepartmentofAgriculture,Washington,DC 20250,orcall (202) 720-7327 (voice)or(202) 720-1127 (TDD). USDA IssuedNovember 1994 isanequalemploymentopportunityemployer. ACKNOWLEDGMENTS CONTENTS TheauthorsacknowledgetheassistanceofVeltonBanks, Testprocedures 2 LewisSchoolfield, Matthew Paige,andTerry Williamsof theFloridaSugarCaneLeague, Inc., forcarryingoutmuch Resultsand discussion 3 ofthefieldworkdescribedherein. Plant-canecrop,mucksoils 3 Plant-canecrop, sandy soils 3 Plant-canecrop,generalcharacteristics 3 First-ratooncrop,mucksoils 4 First-ratooncrop, sandy soils 4 First-ratooncrop,generalcharacteristics 4 Second-ratoon crop 4 Summary 5 References 5 Tables 6 iii ih5" EVALUATION OF NEW CANAL Floridasugarcanegrowersandscientistshavedealtwith POINT SUGARCANE CLONES seriouspestsformorethanadecade. Thepestthathas 1993-94 Harvest Season causedthemostdifficultyin selectingresistantcultivars has beensugarcanerust,PucciniamelanocephalaSyd &P. B.Glaz,JM.Shine,Jr.,P.YJ3.Tai,J.D.Miller,C.W.Deren, Syd. ThediseaseagainstwhichFloridasugarcanegrowers J.C.Comstock,andO.Sosa,Jr. andscientists havehad themostsuccessin selecting resistantcultivarshasbeen sugarcanesmut, Ustilago Clonal selectionatprecommercial stagesisoneofthe scitamineaSydandP. Syd. Floridasugarcanegrowers majorcomponentsinthesuccessfulcommercialproduction addedleafscald,Xanthomonasalbilineans(Ashby) Dow, ofsugarcane,complex hybridsofSaccharumspp. Al- totheirlistofmajorsugarcanediseases severalyearsago. thoughproductionofsugarperunitareaisaveryimportant Now,thelistmaybefurtherupdatedifyellowleafsyn- characteristic, itisnottheonlyfactoron whichcaneis dromeis verifiedasadisease. evaluated. In addition,analysesaremadeon thequantityof caneneededtoproduceaparticularsugaryieldand on the DamaginginsectpestsinFloridaoflongdurationarethe fibercontentofthecane. The timeofyearand theduration sugarcaneborer,Diatraeasaccharalis(F.); the sugarcane thataclone yieldsitshighestamountofsugarperunitarea wireworm,Melanotuscommunis; andthesugarcanegrub, canbeveryimportant,sincesugarcane harvestseasons Ligyrussubtropicus. An insectdiscovered in Floridain extend from fall to spring. Becausesugarcaneiscommer- 1990, the sugarcane lacebug,Leptodictya tabida (Hall ciallygrowninplantandratooncrops,clonesareevaluated 1991),hasalsobecomeapest,selectivelyfeedingupon accordingly. Floridagrowershaverecently madealarge- someclones. scalechangefrommanual tomechanical harvesting. Therefore,clonaladaptabilitytomechanical harvestingisa Each yearatCanalPoint,FL, weevaluateapproximately traitthathasrecentlygained in importance inFlorida. 100,000seedlingsfromcrossesderivedfrom adiverse germplasm collection,althoughperhapsnotasufficiently Informationaboutthestabilityofaclone’sperformance diversecytoplasmicbase(Mangelsdorf 1983). This year acrossenvironments aidsin selectingclones thatwill mostoftheparentalclonesinourprogram originatedfrom perform wellacrossallenvironments. Stabilitymeasure- CanalPoint. Inaddition,clones usedasparentsthis season mentsalsoenable identificationofclonesthatwillperform camefromFlorida(Clewiston),Louisiana,andTexas,and wellonly in specificenvironments. This stabilityfactoris from Australia, Brazil,New Guinea,Taiwan,andVenezu- importantinourevaluationsbecauseofthewiderangeof ela.Also, weusedseveral feralSaccharumofficinarumand environmentsforgrowing sugarcane inFlorida. Large Saccharumrobustumclonesandinterspecifichybridsof temperature,moisture,soil, andotherdifferencesamong theseclonesasparents. Oneparentfrom eachoffiveCanal environmentscompel us to identify location-specificclones Point(CP) clonesincludedin thisreport(CP88-1066, CP because fewclonesdowell inallenvironments. 88-1165, CP88-1409,CP 88-1834,andCP88-1836) came from otherbreedingprograms. CP88-1066,CP88- Cloneswith thedesiredagronomiccharacteristicsalso must 1165,andCP88-1409 hadaparentfrom thesugarcane beproductivein thepresenceofharmful diseases,insects, breedingprogram in Clewiston,FL; andCP88-1834and and weeds. Determination ofpestresistanceand tolerance CP88-1836 hadaparentselectedfrom abreedingprogram requires several years. Somepestsrapidly developnew, inLouisiana(table 1). virulentraces orstrains. Clonalresistancetosuchpatho- gens oftenchangesovertime, sowecannotregard any Weselectabout 1 percentofthe 100,000seedlingsovera cloneaspermanently resistant The selection team musttry 2-yearperiod atCanalPoint. The firstyearwe visually notto discardclonesthathave sufficientresistanceor selectabout 10percent,or 10,000oftheavailable seed- tolerance topests, butitalsomustdiscardclonesthatare lings,andvegetatively orclonallypropagate them. From too susceptible topests tobegrowncommercially. Glazet this stageonin theselectionprogram,allreproductionis al. (1986)presentedaformulaandprocedure tohelp vegetative, hencetheuseofgeneticallyidenticalclones, growersdistributetheiravailable sugarcanecultivars while assumingnomutations. Thesecondyearwevisuallyselect consideringpossibleattacks ofnewpests. about 10percentofthese 10,000clones. From these 1,000 selectedclones, weselect 131 forcontinuedtestingin Glazisanagronomist,TaiandMillerareresearchgeneticists,Comstock replicatedexperimentsfor2yearsat4 locations.The isaresearchplantpathologist,andSosaisaresearchentomologist,U.S. primaryselectioncriteria forthegroupsof 1,000 and 131 DepartmentofAgriculture,AgriculturalResearchService,U.S.Sugarcane FieldStation,StarRoute,Box8,CanalPoint,FL33438.Shineisa clonesarediseaseresistance,canetonnage,andsugar researchextensiondirectorwiththeFloridaSugarCaneLeague,Inc.,P.O. estimates. Drawer1208,Clewiston,FL33440.Derenisanassociateprofessorin gFeonoedtiacnsdwiAtgrhitchueltEuvrearlgSlcaideensceRse,seUanrivcehrasintdyEodfucFlaotriiodna,CePn.tOe.r,BoInxst8i0t0ut3e,of The 10or 11 mostpromisingclonesreceivecontinued BelleGlade,FL33430. testing for3 moreyearsin theexperimentsreported inthis 1 annual publication.Taiand Miller(1989)describedthis thesecond-ratoonexperimentatA. Dudaand Sons’ Farm selection program inmoredetail.Thisyear’sreportisthe (southeastofBelleGlade) wereconductedon Daniamuck firstin this seriesin which tonnageestimatesarebased soils. AsdescribedbyMcCollum etal. (1976),ofthemuck solelyonstalkcountsandstalksamples. Inprevious soils in SouthFloridacomprisedprimarily ofdecomposed reports, tonnageestimateswerebasedonactualplot sawgrass (CladiumjamaicenseCrantz), Daniaisthe weights.Thenew procedure was institutedbecause shallowest. Theothermuck soils similarto Daniamuck, weighingplotsdid notallow us to simulatemechanical listed in orderofincreasing depth, areLauderhill,Pahokee, harvestingconditions.Clones thatsuccessfully complete and TerraCeiamucks. theseexperimentalphasesundergo2 to4 yearsofevalua- — tionandseedcaneincreaseby theFlorida SugarCane Sixexperiments wereconductedonLauderhill mucks the League,Inc.,beforecommercialrelease. Someofthis threeexperiments atWedgworth Farms (eastofBelle evaluationoccursconcurrently with theevaluations Glade), theplant-caneandsecond-ratoonexperimentsat describedherein. OkeelantaCorp.,andthe first-ratoon experimentatDuda. Cloneswith characteristicsthatmaybevaluablefor SevenexperimentswereconductedonPahokeemucks. sugarcanebreedingprogramsareidentifiedthroughoutthe Theseincludedthethreeexperiments atSouth Florida selection process. Sugarcanebreedersoften seekclones Industries (near20-MileBend), theplant-caneexperiments with specificcharacteristics. From May 1993 to April 1994, atDudaand Knight’sFarm (southwestof20-Mile Bendin Australia,Colombia,CostaRica,Guatemala, Mauritius, Palm Beach County),and thetworatoon experiments at Morocco,Nicaragua,Pakistan, Spain, Switzerland,Taiwan, NewFarm, Inc. (eastofCanal Point).—Threeexperiments Thailand,andZimbabwereceived CPclonesorseeds from wereconductedonTerraCeiamucks theplant-cane CanalPoint.California, Maryland, Minnesota,Ohio,and experimentatNewFarm andthe tworatoon experiments at twootherlocations in FloridaalsoreceivedCanal Point Knight’sFarm. The threeexperimentsatEastgate (northof clones. BelleGlade) wereon Torrymuck, the threeexperimentsat HilliardBrothers’ Farm (westofClewiston) wereon TEST PROCEDURES Malabarsand,andtheplant-caneandfirst-ratoon experi- mentsatLykes Brothers’ Farm wereon Pompano fine In 26experiments,28 new CPclones (9clonesoftheCP sand. 89 seriesintheplantcrop,9clonesoftheCP88 series in the first-ratooncrop, and 10clonesoftheCP87 series in Inallbut2ofthe26 experiments,clones wereplanted with thesecond-ratooncrop) weresampledandharvestedat9 2 linesofseedcaneperfurrow. In thetwoexperiments at growers’ farms (table 1). In theplant-caneexperiments, LykesBrothers’ Farm,clones wereplanted with one lineof threeadditionalclonesoft—heCP89 series weretestedat seedcaneperfurrow. Inall 26experiments,clones were someofthenine locations CP89-1268andCP 89-1756 plantedinplotsarranged inrandomizedcomplete-block weretestedateightlocations,andCP89-1509 was tested designswith fourreplications. Each plotwas 10.7 meters atonelocation. In the first-ratoon experiments,two longand6.1 meters wide(0.0065 hectare),exceptin the additionalcl—onesoftheCP88 seriesweretestedatsomeof plant-caneexperimentatLykes Brothers’ Farm whereplots thelocations CP88-1409 wastestedatthe seven muck were7.3 meterslongand6.1 meters wide.Thedistance locations,andCP88-1540 was testedatthetwosites betweenrows was 1.5 meters,and 1.5-meteralleyssepa- havingsandy soils. rated thefrontandbackends oftheplots. Themarginsof theexperimentswereprotectedwithan extrarow of CP70-1133, the third mostwidelygrown clonein Florida sugarcaneoneach sideandanextra 1.5 meters ofsugar- (Glaz 1994), wastheonlyreferenceclone ineightofthe cane in thefrontandback. The fourthrowofeach four-row nineplant-caneexperimentsandtheprimaryreference plotwasnotbuffered from thefirstrow ofitsadjacentplot clonein theratoon experiments. CP73-1547,the fifth most in theratoonexperiments. In theplant-caneexperiments, widelygrown cloneinFlorida (Glaz 1994), wasasecond- mostplotsand borderrows wereofthe sameclone. aryreferencecloneatonelocationwithasandy soil in the plant-caneexperiments.CP72-1210, the fourth most Each clonewasrated foritsreaction tosugarcanesmut, widelygrown cloneinFlorida(Glaz 1994), wasasecond- sugarcanerust,andleafscaldby natural infection. In aryreferenceclonein theratoon experiments. addition,eachclonewas artificiallyinoculatedwith smut and leafscaldandlaterrated forits susceptibility in Plant-crop,first-ratoon,andsecond-ratoon experiments separateexperiments. Beforereaching this stageof wereconductedateach locationexceptattheLykes selection,clones weretestedbyartificial inoculation for Brothers’ Farm (nearMooreHaven in GladesCounty), susceptibility to sugarcane mosaic virusandeye spot which hadnosecond-ratoonexperiment. Thefirst-ratoon (Bipolarissacchari). experimentatOkeelantaCorp. (southofSouth Bay) and 2 Thefarm managementateach location controlledsugar- table5 contains theresultsoftheplant-caneexperimentson canemanagementpractices, suchas fertilization,cultiva- sandy soils. Tables6-8contain theresultsofthefirst- tion,andpestcontrol. Twosamplesoften stalkseach were ratoonexperimentsonmucksoils,andtable9 containsthe sampledperplotfrom unbumedcane ineachexperiment resultsofthefirst-ratoonexperimentson sandysoils. betweenOctober 14, 1993,andMarch23, 1994. Therange Tables 10-12contain theresultsofthesecond-ratoon ofsampledates foreachcropwas asfollows: December6, experiments.Table 13 liststhedates thatstalks were 1993, toFebruary 23, 1994, for theplantcrop; October26, countedineachexperiment 1993, toMarch23, 1994, forthefirst-ratooncrop; and October 14, 1993, toFebruary24, 1994, forthesecond- Plant-Cane Crop,Muck Soils ratooncrop. Crusherjuicefrom the stalks wasanalyzedfor Brixandsucrose,andtheoreticalrecoverableyieldsofkg CP89-1756 yielded significantlymoremetrictonsofsugar 96°sugarper metric tonofcane (KS/T) weredeterminedas perhectare (TS/H) than CP70-1133 (table4).Theout- ameasureofsugarproductionafterthe stalksamples were standingTS/HyieldofCP89-1756was mainlydueto its transportedto the AgriculturalResearch Service’s labora- high kilogramsofsugarpermetric ton ofcane(KS/T), tory atCanalPointforweighing andmilling. which wassignificantlymore than forallotherclones exceptCP89-1325 (table 3). Theyieldofmetric tonsof Total harvestable stalksperplotwerecountedbetween caneperhectare(TC/H) ofCP89-1756was similartothat June30, 1993,andOctober 1, 1993. Yields ofmetric tons ofCP70-1133 (table2). Asshown by its stability-safety ofcaneperhectare (TC/H) werecalculatedby multiplying indices,CP89-1756 hadconsistently highTC/H, KS/T, stalkweightsbynumberofstalks. Yields ofmetric tonsof andTS/Hyieldsacrossenvironments (tables 2-4). sugarperhectare (TS/H) werecalculatedbymultiplying TC/HbyKS/Tand dividingby 1,000. TheTS/HyieldsofCP89-2143,CP89-1945,CP89- 2377,CP89-2376,andCP89-1717 weresimilartothe In thisreportall values foryieldofsugarpermetric tonof TS/H yieldofCP70-1133 (table4). Thefirstthreeofthese caneandforyieldofsugarperhectarearetheoretical clones (CP89-2143,CP89-1945,andCP89-2377) were recoverable yields. Anexplanationoftheprocedureused to thehighestrankingclones in yieldsofTC/H,although none calculatethese yields usingfiberpercentagesis inLegendre yieldedsignificantly moreTC/HthanCP70-1133 (table (1992). 2). In addition to theirhighranking inTC/H,CP 89-1945 andCP 89-2377yieldedsignificantly moreKS/TthanCP Analysesofvarianceweredoneusing theprocedures 70-1133 (table3). CP89-2376 andCP 89-1717were describedby McIntosh (1983). F-ratioswerechosen similartoCP70-1133 inTC/H,butCP89-2376yielded according toamixedmodel, with treatments (clones) fixed significantly moreKS/Tthan CP70-1133 (tables2and3). andlocationsrandom. Thesourceofvariation thatcorre- spondedtotheerrorterm fortheeffectbeingtested was Plant-Cane Crop, Sandy Soils usedtocalculate theleastsignificantdifference (LSD). LSDwas usedregardlessofsignificanceofF-ratios inall Nonewcloneyieldedsignificantly moreTS/Hthan CP70- analyses toprotectagainsthigh type-IIerrorrates (Glaz 1133 atboth locations with sandy soils (table5). However, and Dean 1988). Significantdifferences weresoughtatthe CP89-1509 yielded significantlymoreTS/Hthanany 10percentprobability level. cloneplantedatHilliardBros.,which was theonly location whereCP89-1509 wasplanted. TheoutstandingTS/H Analysesofclonal stabilityacross locations weredoneby yieldofCP89-1509 was mainlyduetoits high TC/H using theproceduresrecommended in Shukla(1972). For yield, whichwas significantly morethan thatofanyother eachclone, the stability-varianceparameterofShuklawas cloneatHilliardBros, (table5). subsequentlyusedtocalculateastability-safetyindexas describedbyEskridge(1990). Themean yieldoftheclone CP89-1756 wasplantedon sandy soilsonlyatLykes Bros, and thestabilityofthecloneacrosslocations influences the and yielded significantly moreTS/HthanCP70-1133 valueofthisstability-safety index. Thehigherthestability- (table5). TheoutstandingTS/HyieldforCP89-1756was safety index,the morelikely theclone istohavehigh mainlydue to itshighTC/Hyield(table5); itwas oneof yieldsatall locations. twoclones thatyieldedsignificantlymoreTC/H thanCP 70-1133. RESULTS AND DISCUSSION Plant-Cane Crop, General Characteristics Table 1 liststheparentage,percentageoffiber,and reactionsto smut,rust, andleafscalddiseasesforeach Alloftheclones in theCP89 series had fiberlevelswithin cloneincludedin theseexperiments. Tables2-4contain the thenormalrange (table 1). Noclonein thisgroup has yet resultsoftheplant-caneexperiments on mucksoils,and beenclassifiedas too susceptible tosmut,rust,orleafscald 3 forcommercialproduction (table 1). However, lowlevels KS/Tyieldwas dueprimarily to itsKS/TyieldatHilliard ofrusthavebeen foundonCP89-1268,CP89-1632, CP Bros. (Glazetal. 1993). 89-1643,CP 89-1717,CP89-1756,andCP89-2376. Basedon innoculation tests andnatural infection tests CP88-1540andCP88-1066also yieldedmoreTS/H than recordedmostlyatOkeelantaCorp. andEastgateFarms, CP70-1133 lastyearin theplant-canecrop (Glazetal. sevenclonesoftheCP 89 series(CP 89-1268,CP89- 1993). This year,both cloneshadTC/H, KS/T,andTS/H 1331,CP89-1632,CP89-1643,CP89-1717,CP89- yieldsnotsignificantlydifferentfrom thoseofCP70-1133 1945, andCP89-2376) wereclassifiedas having interme- (table9). As wasthecase lastyearfortheplant-canecrop diate susceptibility toleafscald(table 1). CP89-2376had (Glazetal. 1993),thegrowth habitofCP 88-1066wasnot substantially more leafscaldatEastgateFarms than the conducive to mechanical harvestthis yearin the first-ratoon otherclones. crop. First-Ratoon Crop, Muck Soils First-Ratoon Crop, General Characteristics Noclone yieldedsignificantly moreTC/H, KS/T,orTS/H CP88-1066andCP 88-1762 hadfiberpercentages slightly thanCP70-1133 (tables6-8).Lastyearasplantcane,CP higherthan thosenormally foundincommercial sugarcane 88-1834andCP88-1561 yielded significantlymoreTS/H cultivars inFlorida. CP88-1066, CP88-1165,CP 88- than CP70-1133 (Glazetal. 1993). This year, CP 88-1834 1508,CP88-1573,CP 88-1836, andCP88-1912 had andCP88-1561 rankedlower,althoughnotsignificantly intermediaterustsusceptibility, andCP 88-1912 had different, thanCP70-1133 inTS/H (table 8).Lastyear, CP intermediate susceptibility to leafscald(table 1). 88-1834 yielded significantly more KS/TthanCP70-1133 (Glazetal. 1993)butthisyearyieldedsignificantly less Second-Ratoon Crop KS/Tthan CP70-1133 (table 7). CP87-1490 was theonly clone in theCP 87 seriesto yield CP88-1912,CP88-1508,and CP88-1762 yielded significantly moreTS/H than CP70-1133 andhadan similarly toCP70-1133 both lastyearasplantcane(Glaz outstanding stability-safety index forTS/H (table 12). CP etal. 1993)and thisyearas firstratoon (tables6-8). CP 87-1490alsoyielded significantly moreTC/Hthan CP70- 88-1508 hadextremely low stability-safety indicesforTC/ 1133 (table 10)and had KS/T yields similartothoseofCP HandTS/H (tables6and8). YieldsofCP88-1508 were 70-1133 (table 11). Two yearsagoas plantcane, CP 87- moderatetomediocreatall locationsexcepton theTorry 1490 hadTC/H, KS/T, andTS/H yields similartothoseof mucksoil atEastgateFarms. AtEastgate, theTC/Hand CP70-1133 (Glaz etal. 1992). Lastyearin thefirstratoon, TS/H yields ofCP88-1508 weresignificantly higherthan CP87-1490 yields rankedsimilarto thoseofthis yearin thoseofanyotherclone, and its KS/Tyield wassignifi- comparison toCP70-1133 yields; itsTC/HandTS/Hwere cantly higherthan foranyothercloneexceptCP88-1836 significantly higherthan thoseofCP70-1133 and itsKS/T (tables6-8). yields were similar(Glazetal. 1993). CP87-1490 was the onlyclone in thisgroupthatyielded significantly more Lastyearasplantcane,CP88-1409 showedpromisedue TS/H thanCP70-1133 for the 3-yearaverageofplantcane toits high KS/Tyieldsandmostlyerectgrowth habit(Glaz throughsecondratoon (datanotshown). Two concerns etal. 1993). This yearitsgrowth habitremained similarly with CP87-1490areitsintermediate susceptibility to rust erect,butitsKS/Tyield was moderateratherthanoutstand- and itssusceptibility toleafscald. ing (table7). Also, itsTC/Hyieldwas very low thisyear (table6), which caused itsTS/Hyieldtobesignificantly Nootherclonebesides CP87-1490 yielded significantly less than thatofCP70-1133 (table 8). moreTS/H thanCP70-1133 (table 12). However,CP 87- 1475,CP87-1226, CP87-1248,andCP87-1737 yielded First-Ratoon Crop, Sandy Soils significantly moreTC/Hthan CP70-1133 (table 10). Three oftheseclones (CP87-1475, CP87-1226, andCP87- Nocloneyieldedsignificantly moreTS/H than CP70-1133 1737) yielded significantly lessKS/Tthan CP 70-1133 averagedacrossboth locations with sandysoils (table9). (table 11). However,CP88-1508, which alsohadoutstandingyields on theTorry muck soil (tables6-8), hadTC/H and TS/H Dueprimarily tohigh KS/Tyields,CP87-1274 was a yields significantly higherthan thoseofCP70-1133 on the promisingcloneasplantcane (Glaz etal. 1992) andas Pompano finesandatLykes Bros, (table9). Lastyearas first-ratooncane(Glazetal. 1993). As second-ratooncane, plantcane,CP88-1508 hadoutstandingTC/H, KS/T,and its KS/Tyield wasnothigh,and subsequently itsTS/H TS/H yieldsaveragedacross both locationswith sandy yield wasonly moderatelyhigh (tables 11 and 12). These soils. Butthehigh TC/Hand TS/Haverages weredue moderateyieldscombined with itsmoderate susceptibility primarily tothe high yieldsatLykes Bros.,and the high torust(table 1) has lessened ouropinionofthecultivar. All 4