weedy rice update
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Weedy Rice Update
UCCEWinterGrowerMeetings2018
WhitneyBrim-DeForest,RiceAdvisor
Survey: Winter 2017
• 160growersandPCA’sweresurveyedat5meetingsin4counties(Butte,Glenn,Colusa,andSutter):• 40%respondedthattheyhadsuspectedafieldwasinfestedwithweedyrice• 49%statedthattheyhadseenitpriorto2016• 57%hadnotreportedtheinfestationtoUCCE
• Approximately25%ofinfestationslikelynotreported
Bytheendoftheseason,wehadatotalof:• 53samplessubmittedfortesting• Outofthe53,22confirmedtobeweedyrice• About42%ofthesamples!
Eightseedfieldswerefoundtobeinfestedwithweedyriceandwererejectedasseedfields:• 3werenewmediumgrainseedfields• 1wasanestablishedmediumgrainseedfield• 4werespecialtyvarietyseedfields
FieldSurvey:2017
No new biotypes identified
Photos:TimothyBlank,CCIA
Sprangletop:-Likerice(andweedyrice),ithasaligule,soitcanbeconfusing(esp.beforeheading)-Hasawhitestripedownthemiddleoftheleaf(mid-vein)
ElongatedUpperInternode(EUI):-Ageneticabnormalityofcommonmediumgrainricevarieties-Causesthepartofthestemattachedtothericepanicletoelongate-Theplantwilllookjustlikethevarietyplantedinthefield
Research Updates
Soil Seedbank Surveys: Fall 2016
• Sample10fieldswithknowninfestations• 34soilcorestakenevery20feetalongtransect• Soilsampleswerewashedinasaline(salt)solutiontoextractorganicmatter• RiceseedsfoundineachcoreweresubjectedtoaKOH(potassiumhydroxide)test
Table 1. Weedy rice seed counts from soil samples collected in Fall 2016. County Ecotype Seeds m-2 Samples Present (%) Butte 1 31.3 41 Sutter 1 2.3 6 San Joaquin 1 23.2 32 Glenn 1 4.6 9 Yuba 2 29.0 21 Sutter 2 4.6 12 Colusa 3 2.3 6 Colusa 3 7.0 18 Sutter 5 39.5 42 Yolo Control 0.0 0
165,000seedsperacre
9500seedsperacre
Research Updates WeedyRiceBiotypeUpdates
• Type1:• Awnless• Strawhullcolor• Tallstature• Nocoloronnodes
• Allrice-growingcounties(exceptforColusa)
0
20
40
60
80
100
120
SHA
T
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
0.0125Prob > F3.30F
Distribution of SHAT
0
20
40
60
80
100
120
SHA
T
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
0.0125Prob > F3.30F
Distribution of SHATBreakingte
nsilestrength(gf)
18
19
17
37
0
20
40
60
80
100
DO
RM
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
<.0001Prob > F27.43F
Distribution of DORM
18
19
17
37
0
20
40
60
80
100
DO
RM
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
<.0001Prob > F27.43F
Distribution of DORM
%Germination
Type1:• Highshattering• Highdormancy
ImplicationsforManagement:• Highdepositionintoseedbank• Lengthoftimeinsoil:manyyears
• Type2:• Awnless• Bronzehullcolor• Tallstature• Nocoloronnodes
• Butte,SutterandYubaCounties
0
20
40
60
80
100
120
SHA
T
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
0.0125Prob > F3.30F
Distribution of SHAT
0
20
40
60
80
100
120
SHA
T
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
0.0125Prob > F3.30F
Distribution of SHATBreakingte
nsilestrength(gf)
18
19
17
37
0
20
40
60
80
100
DO
RM
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
<.0001Prob > F27.43F
Distribution of DORM
18
19
17
37
0
20
40
60
80
100
DO
RM
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
<.0001Prob > F27.43F
Distribution of DORM
%Germination
Type2:• Highshattering• Lowdormancy
ImplicationsforManagement:• Highdepositionintoseedbank• Lengthoftimeinsoil:short!
• Type3:• Awned• Strawhullcolor• Tallstature• Nocoloronnodes
• GlennandColusaCounties
0
20
40
60
80
100
120
SHA
T
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
0.0125Prob > F3.30F
Distribution of SHAT
0
20
40
60
80
100
120
SHA
T
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
0.0125Prob > F3.30F
Distribution of SHATBreakingte
nsilestrength(gf)
18
19
17
37
0
20
40
60
80
100
DO
RM
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
<.0001Prob > F27.43F
Distribution of DORM
18
19
17
37
0
20
40
60
80
100
DO
RM
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
<.0001Prob > F27.43F
Distribution of DORM
%Germination
Type3:• Highshattering• Highdormancy
ImplicationsforManagement:• Highdepositionintoseedbank• Lengthoftimeinsoil:manyyears
• Type4:• Awned• Blackhullcolor• Shortstature• Nocoloronnodes
• Currentlyinonelocation,GlennCounty
0
20
40
60
80
100
120
SHA
T
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
0.0125Prob > F3.30F
Distribution of SHAT
0
20
40
60
80
100
120
SHA
T
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
0.0125Prob > F3.30F
Distribution of SHATBreakingte
nsilestrength(gf)
18
19
17
37
0
20
40
60
80
100
DO
RM
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
<.0001Prob > F27.43F
Distribution of DORM
18
19
17
37
0
20
40
60
80
100
DO
RM
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
<.0001Prob > F27.43F
Distribution of DORM
%Germination
Type4:• Highshattering• Highdormancy
ImplicationsforManagement:• Highdepositionintoseedbank• Lengthoftimeinsoil:manyyears
• Type5:• Awnless• Strawhullcolor• Tallstature• Purple-colorednodes
• Sutter,Yuba,andYoloCounties
0
20
40
60
80
100
120
SHA
T
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
0.0125Prob > F3.30F
Distribution of SHAT
0
20
40
60
80
100
120
SHA
T
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
0.0125Prob > F3.30F
Distribution of SHATBreakingte
nsilestrength(gf)
18
19
17
37
0
20
40
60
80
100
DO
RM
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
<.0001Prob > F27.43F
Distribution of DORM
18
19
17
37
0
20
40
60
80
100
DO
RM
CARV Type_1 Type_2 Type_3 Type_4 Type_5
Ecotype
<.0001Prob > F27.43F
Distribution of DORM
%Germination
Type5(twogroups):• Highshattering• Lowdormancy
ImplicationsforManagement:• Highdepositionintoseedbank• Lengthoftimeinsoil:short!
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
RESVarieties
Koshihikari Type1 Type2 Type3 Type4 Type5
Chloroph
yllcon
tent(Spa
dun
it)
CAWeedyRice
Leafcolorintensity(chlorophyllcontent) CAweedyrice
Phenotypiccharacterizationsofweedyrice
RESricevarieties
S102M205
L202 3LFF
2.12.2
14
5
0.0
20.0
40.0
60.0
80.0
100.0
120.0
140.0
160.0
RESVarieties Koshihikari Type1 Type2 Type3 Type4 Type5
Plan
tHeight(cm
)
CAWeedyRice
Plantheightmeasurement
RR116RR111
RR133 M-205
144cm99cm74cm86cm
Characteristics Populations Durationoftimeinsoil
Highdormancy,highshattering Type1,Type3,Type4 Long-term(maybe10
ormoreyears)
Lowdormancy,highshattering Type2,Type5
Shorter(likelytobeafewyears,butonlyifmoreseedisnotbeingputintothesoilseedbank)
• Allpopulationsare:red-branned(redpericarp)• Allpopulationsare:lightergreenthanJaponicavarieties• Allpopulationsare:tallerthanCalrosevarieties
Summary of Preliminary Genetics
• Fivegeneticgroups,whichalignwellwithoutwardcharacteristics(phenotypes)
• Type1:Mostcloselyrelatedtoblack-hulledweedyricefromthesouthernUSandAusvarieties
• Type2:Mostcloselyrelatedtostraw-hulledweedyricefromthesouthernUSandIndicavarieties
• Type3:Mostcloselyrelatedtostraw-hulledweedyricefromthesouthernUSandIndicavarieties
• Type4:Mostcloselyrelatedtostraw-hulledweedyricefromthesouthernUSandIndicavarieties
• Type5:MostcloselyrelatedtoJaponica(bothtemperateandtropicalvarieties)Types3and4aremostcloselyrelatedtoeachother!
Types2,3and4closelyrelatedtoeachother!
DiverseCaliforniaweedyredriceecotypesàmultiplepossibleorigins!!!
Type1Type2Type3Type4Type5 M-205
Herbicide Screening
Pre-emergentHerbicideTesting
Control Abolish Goal Prowl
Treatments and Rates
• Herbicideswereapplied1dayafterplantingtheseedstoabout1cmdepth(simulatedrill-seededsystem)• Picturesweretaken23daysafterspraying
• Herbicides:• Prowl-2pts/A• Abolish-2qts/A• Goal2X-2pts/A
Control Abolish Goal Prowl
Noeffectonanyoftheweedyricebiotypes
Bolero GraniteGR Cerano Butte
Post-emergentGranularHerbicideTesting
Treatments and Rates
• Herbicideswereapplied10daysafterplanting(1-2leafstageofrice)• Twodaysafter(48hrs)plantswereplacedat4-inchwaterdepth• Picturesweretakentwoweeksafterherbicideapplication
• Herbicides:• Bolero-23.3lbs/A• Cerano-12lbs/A• Butte-7.5lbs/A• GraniteGR–15lbs/A
Bolero Butte Cerano GraniteGR
Control
M-205
LeafbleachingofM-205byCerano.
Weedyricetype1
Bolero Butte Cerano GraniteGR
ControlsM-205 WR-T1 WR-T1 WR-T1 WR-T1 WR-T4
StuntingofWRtype1byabout50%byBolero.
Bolero Butte Cerano GraniteGR
ControlsM-205 WR-T2 WR-T2 WR-T2 WR-T2 WR-T2
Weedyricetype2
StuntingofWRtype2byabout50%byBolero.
Weedyricetype3
Bolero Butte Cerano GraniteGR
ControlsM-205 WR-T3 WR-T3 WR-T3 WR-T3 WR-T3
BoleromakesWRtype3stuntedbyabout35%.LeafbleachingbyCerano.
Weedyricetype4
Bolero Butte Cerano GraniteGR
ControlsM-205 WR-T4 WR-T4 WR-T4 WR-T4 WR-T4
WRtype4leavesarebleachingbyCerano.
Weedyricetype5
Bolero Butte Cerano GraniteGR
ControlsM-205 WR-T5 WR-T5 WR-T5 WR-T5 WR-T5
NoeffectonT5.
Granular Herbicide Screening Summary
• SomeinjurynotedonTypes1-4fromBolero,butplantsrecovered• Type5:noinjuryfromanyherbicides
ClethodimSpot-SprayingintheFieldCollaborator:JimCook
• Spot-sprayedtilleringType3weedyrice
• Treatment1:3seconddurationsprayof2/3%V/VSelectMax+0.25%V/VNIS
• Treatment2:5seconddurationsprayof2/3%V/VSelectMax+0.25%V/VNIS
• Treatment3:3seconddurationsprayof2/3%V/VSelectMax+1%V/VCOC
• Treatment4:5seconddurationsprayof2/3%V/VSelectMax+1%V/VCOC
• Damagetosurroundingriceextendednomorethan9.6inches(foralltreatments)
• LongerdurationprovidedbettercontrolwhenusingNIS(5seconds)
• TreatmentswithCOCassurfactantprovidedbettercontrol,regardlessofduration(82%and93%)
0
10
20
30
40
50
60
70
80
90
100
Trt1 Trt2 Trt3 Trt4%Con
trol
8DAT 18DAT 25DAT
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