ButteCounty

August2019

UCCEButteCounty.2279-BDelOroAvenue,Oroville,CA95965

Office:530.538.7201Fax:530.538.7140Email:butte@ucanr.eduWebsite:http://cebutte.ucanr.edu

Rice Leaf

Signupforthe2019UCCERiceYieldContest!

YoucouldwinaJohnDeeregatorWe realize that this has been a tough year forjust about everyone growing rice; however therice yield contest will go on and it will beinteresting to see what sort of yields we canexpectfromayearlikewehavehad.2019marksthefifthyearoftheUCCERiceYieldContest.Wehave learneda lot fromthesecontestsandhaveseen yields up to 135 sacks/acre! To enter theRiceYieldContest,youneedtosendusanEntryform. Entry forms are required by August 28,2019 at theAnnualRice FieldDay. Entry formsandcontestdetailswillbeavailableat theFieldDayaswellasat:

http://rice.ucanr.edu/Rice_Yield_Contest/.

The Prize: A number of companies have helpedto sponsor the Grand Prize for the contest - aJohnDeere gator. Thewinner from each region

will have an equal chance (1 in 3 chance) ofwinning the Grand Prize. Contest winners willdraw for the prize at the 2019 winter growermeetings. Each winner will still receive thecovetedhat.

Sponsors: The following companies eachsupported the contestwith gifts ofup to $1500each: Corteva, FMC, Gowan, Nichino, Syngenta,UPL, Valent, Wilbur-Ellis, and Valley Truck andTractor.

If you have any questions, go to our websitelistedaboveorcallBruceLinquistat(530)902-2943.

ArticlebyBruceLinquist,UCDavis

CollectingWeedSeedsforHerbicide-ResistanceTesting

Herbicide resistance is a serious problem inCalifornia rice. However, not every controlfailurecanbeattributedtoherbicideresistance.Otherfactorscanbethecauseofcontrolfailures.Amongthemostcommonareweather,incorrectrate,poor coverageor application timing, skips,andsprayequipmentmalfunction.

When weed control fails, it is important todetermine the cause. And when the cause isherbicideresistance,herbicideprogramsneedtobe adjusted. Resistance occurs after the sameherbicides have been used repeatedly at the

same site for several years. You will notice agradualdeclineintheefficacyoftheherbicidetocontrolweedsthatwereoncesusceptible.Whenherbicideresistanceistheproblem,youwillfindhealthy plants alongside dead ones of the samespecies after treatment; surviving weeds formdiscrete patches that consistently survive theherbicidetreatment.

The UCCE Rice Weeds Program conductsherbicide resistance testing for the major riceherbicides used in California at the RiceExperiment Station (RES) in Biggs. Results of

UniversityofCaliforniaCooperativeExtensionRiceLeaf June2019

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these tests help growers improve their weedcontrolprogramsandalsohelpthericeindustrykeep track of resistance issues. If you suspectherbicide resistance, collect seeds of the targetweed, fill out the Resistant Weed Seed Testingform (included in this newsletter and alsoavailable athttp://rice.ucanr.edu/files/288907.pdf), andbring them to your local FarmAdvisor, or sendor drop off at the RES to be tested. ThesesampleswillbetestedinthegreenhouseatRES.Thecontactpersonat theRES isAaronAlvarez.We have hired new team to test 2019 seasonsamples and expect to have all samples testedandresultssentbyendofMarch2020.Wehaveexperienced some difficulties in the last seasondue to staff turnover; however, we are excitedwiththenewweedtestingteam.Tocollectseedsfortesting,followtheseguidelines:

• Don’t wait until harvest to collect theseed.Bythen,mostweedshaveshatteredtheir seeds. If you collect after harvest,you may collect seeds from weeds thathaveemergedlateandthushavenotbeenexposedtotheherbicide.Theobjectiveisto collect seed from plants that havesurvivedtheherbicideaction.

• Collect seeds when they aremature anddislodge easily from the seedhead. Ingeneral,sprangletopmaturestheearliest,between rice panicle initiation andheading.Earlywatergrass,barnyardgrass,smallflower umbrellasedge, and ricefieldbulrush usually follow, maturingsometime before rice heading until

maturity.Latewatergrassmatureslast,atabout the same time early rice varieties(M-205,M-206)mature.

• Collectseeds,notseedheads.Gentlyshake

the seedhead inside a paper bag. Seedsthat shatter are mature and will readilygerminate. If seedheads are collected,seedsmightnotbematureormighthaveshattered already. It is good practice tokeep thepaperbagopen forcoupledaystoallowfurtherseeddrying.

• Collect seeds from areas of the field

where you are certain the herbicideapplication in question was appropriate.Avoid field borders, tractor tire tracks,skips or areas where you suspect theherbicide was not sprayed correctly ornotsprayedatall.

Make sure to collect enough seed. In order tohave conclusive results, several replications ofherbicide resistance testing are needed. Whennot enough seed is provided, replications maynot be possible. For small sized seed weedspecies such as sprangletop, smallflowerumbrellasedgeorricefieldbulrush,collectseedsfrom at least 20 mature seedheads at eachlocation. For barnyardgrass, early and latewatergrass, collect from at least 30 matureseedheads.

ArticlebyKassimAl-Khatib,UCDavis

H E R B I C I D E R E S I S TA N C E T E S T I N G F O R M

Pump

Continuous �ood

Pinpoint

Leather’s method

Was water compromised or lostat any time of the season?

Yes No

Source(s) of water:

Irrigation management:

Bring the sample and form to your local UCCE Farm Advisor or drop o� samples at the address below by the end of October.UC Rice Weed Program | Rice Experiment Station | 955 Butte City Hwy (162) | Biggs, CA 95917

GlennButte

Colusa

YubaSutter

+example

Grower Information

Name: Email:

Weed: Date: / /

Markthe tentative

locationon the

map

Phone #:

Submittee Information

Name: Email: Phone #:

Bolero® Ultramaxthiobencarb

Lipid synthesis (LS) inhibitor

Abolish® 80 EC

Butte®benzobicyclon + halosulfuron

HPPD inhibitor + ALS inhibitor

Cerano® 5MEGclomazone

Pigment sysnthesis inhibitor

SuperWham!® CA

propanil

Photosystem (PS) II inhibitor

STAM® 80 EDFOther propanil

Clincher® CAcyhalofop-butyl

ACCase inhibitor

RiceEdge® 60 DFpropanil + halosulfuron

PS II inhibitor + ALS inhibitor

League® MVPthiobencarb + imazosulfuron

LS inhibitor + ALS inhibitor

Granite® GRpenoxsulam

ALS inhibitor

Granite® SCLondax®

Grandstand® CAtriclopyr

Auxin mimic

Shark® H2Ocarfentrazone-ethyl

PPO inhibitor

Halomax®Regiment® CA

Sandea®

penoxsulam

bensulfuron-methyl

halosulfuron-methyl

bispyribac-sodium

halosulfuron-methyl

Strada® CAorthosulfamuron

GPS coordinates:

Township, Section, Range or Nearest Rd:

Field/Site Information

��

Field ID:

____-__-__Date recieved: ___/___/___

Sample quality:

OFFICIAL USE ONLYV-2018

Inthepast

Thisyear

Knownresis-tance

Suspe-ctedresis-tance

BothCanal

Size of the �eld?

Percentage of the �eld that is a�tected by the suspected resistance?

Field size and a�ected portion

When was the resistance suspected?

�

1- Sample assessment:

3- Resistance testing:

The results of the resistance testing will be sent to this email.

Sect

ion

1Se

ctio

n 2

Sect

ion

3Se

ctio

n 4

Sect

ion

5

Other details, if any

OFFICIAL USE ONLY

Quality:

Quantity:

Suscessful? _______

If not, explain brie�y.

_________________________

_________________________

Report sent on this date:

______ / _____ / _________

Report sent to this email:

_________________________Use empty space for additional details.

Herbicide use and resistance issues:

2- Information provided:_________________________

_________________________

a

UniversityofCaliforniaCooperativeExtensionRiceLeaf June2019

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2019ArmywormUpdateWe had a good start of this armyworm seasonwiththenewsthatIntrepidreceivedaSection18inearlyJune.ThisputgrowersandPCAsatease,knowing that ifpopulationsand injurygethigh,theyhaveatoolthatworksforcontrol.

The trapping season started with low numbersof true armyworm (TA) moths, but with veryhigh numbers of western yellowstripedarmyworm (WYA)moths. In the three years oftrapping Ihaveconducted, IhavenotseensuchhighnumbersofWYAmoths.Eventhoughmothnumberswerehigh, I couldnot findanywormsinriceorweeds,andIdidnotgetanyreportsofWYAinothercrops.IwouldhaveexpectedtoseeorhearofWYAworm infestations,but theydidnothappen.

The outbreakswehave experienced in the pastfewyearshavebeencausedbyTA.Thisyear,astheseasonprogressed,thenumberofTAmothsstarted to increase in early June, andwe saw aclearpeakbyJuly1st(Fig.1).LastyearthepeakoccurredinJune25,aboutaweekearlier.

I closely monitored three fields in Butte andGlenncountieswheretrapshavebeensetupandhave a history of highworm numbers. In thesefields,thefirstsmallwormswerefoundbetweenJune 14 and June 18, just as TAmoth numbersstarted to go up. By July 1st, worms were ofmediumsize,probablyaroundthethirdinstar.Aweek later, on July 8, worms were large, anddefoliation was noticeable. Large wormscontinuedtobepresentallthewayuntiltheendofJuly,withwormsstartingtopupateasearlyasJuly23.

TAmothnumbersarestartingtogoupagain,butinmost locations the numbers are low. By thistimelastyear,TAmothnumberswerepeakingat18moths/trap/day;rightnowthenumberisjustabove 5. The fields I’m monitoring don’t haveanywormsyet.Sincethefirstpeakwaslate,wemightseeasecondpeaklater.

Fig.1.AveragenumberoftruearmywormmothstrappedperdayintheSacramentoValleyduring2019.

This year, some trends were noticeable in ourmothmonitoring.Whenmothnumbers trappedperdaywerebelow30,thewormpressureinthefield tended to be low.However, catchingmorethan 30 moths per night did not necessarilymean that the worm pressure was going to behigh. Armyworm larvae began to appear as theflightofmothsbegan, indicating thestartof theperiod during which moths were laying eggs.Large larvae were found in the field about aweekaftermothtrappingpeaked.

Iwillcontinuetomonitortheflightofthemoths;hopefully we won’t see another peak, whichwould indicate that we won’t see high wormpressure in the field. The trap numbers arepostedweeklyontheUCRiceon-linewebsite.

ArticlebyLuisEspino,UCCE

0

5

10

15

20

25

30

4/15 6/4 7/24 9/12Moths/trap/da

y

UniversityofCaliforniaCooperativeExtensionRiceLeaf June2019

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WeedyRiceScoutingandReportingJust a quick reminder on suspectedweedy ricereporting. If you have applied all herbicides tocontrol grasses, and you are still seeing whatappeartobeskipsormissesingrasscontrol,itisagoodideatogooutandchecktheplants.Iftheydonothavea liguleandauricle, thentheyareagrassspecies(notweedyrice)(Figure1).Iftheyhave a ligule and auricle, then they are eitherrice,orsprangletop.

Figure 1. Ligule and auricle on a rice plant.Watergrass species do not have ligules andauricles.

Figure2.Whitemidveinonsprangletopleaf.

Followthiskeytohelpmakethedetermination:

1) Doestheplanthavealiguleorauricle?a. Ifyes:

i. Does it have a white midvein downtheleaf?(Figure2)1. Ifyes:àSprangletop2. Ifno:àRice

b. Ifno:i. àWatergrass

2) If plant is rice (ligule and auricle), is itweedy?

3) Aretheleavessmooth?(notrough)? a. Ifyes:

i. àLikelyavarietyb. Ifno:àPotentiallyweedyrice(callFarm

Advisortodouble-check).

Sofarthisseason,wehavehadmanycallsaboutweedy rice, but most have been varietalcontaminants. Thank you to everyone that hashadusouttothefieldtocheckplants.Themorevigilantweall are, thebetterwecan tackle thisweed.ArticlebyWhitneyBrim-DeForest,UCCE

UniversityofCaliforniaCooperativeExtensionRiceLeaf June2019

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AlligatorweedSpottedinButteCountyAlligatorweed (Alternanthera philoxeroides(Mart.) Griseb.) was recently spotted in ButteCounty,ontheedgeoftheFeatherRiver(Figure1).Itisaninvasiveweed,commonlyfoundintheSouthernUnitedStates,includinginricefields.ItisconsideredanoxiousweedintheCalifornia.Itwas introduced to the Southern US from SouthAmericaintheearly1900’swithaboat.

Figure1.Alligatorweedpopulationswere foundinButte County inAugust 2019, on the edge oftheFeatherRiver.

Alligatorweed grows well in shallow water, inmuddyareas.Itcangrowupto3fttall,andhashollowstems(Figure2).Theleavesareoppositeon the stem, and the flowers are white andclover-like in appearance (Figure 3). It flowersduring the summer (May-October). In theUS, itdoes not reproduce by seed, but is spreadvegetatively.Thismeansthatpiecesoftheplanthavetofloatalongwaterwaysinordertospread.Boatsarealikelymechanismofmovementfromwaterwaytowaterway.

Figure 2. Alligatorweed in a body of water(photo:ChrisEvans,UniversityofIllinois).

WedonotcurrentlyknowofanypopulationsinricefieldsinCalifornia,butasalways,itisagoodidea to keep a lookout. If you suspect you haveseen this in your fields, as always, please callyourlocalCERiceAdvisors.

Figure 3. Alligatorweed flower, note the clover-likeappearance(photo:GaryBuckingham,USDAAgriculturalResearchService).

ArticlebyWhitneyBrim-DeForest,UCCE

UniversityofCaliforniaCooperativeExtensionRiceLeaf June2019

6

SavetheDate

2019RiceFieldDay

WednesdayAugust28,2019,from8:30amtonoon(Registrationbeginsat7:30).

RiceExperimentStation,955ButteCityHighway,Biggs,CA

Moreinformation:https://www.crrf.orgThe2019RiceWeedCourse

Friday,September6,2019,from8:00AMto4:10PM(Registrationbeginsat7:30AM)

HamiltonRoadField(onWestHamiltonRd.betweenHwy.99&RicetonHwy.)andRiceExperimentStation,Biggs,CA

https://wric.ucdavis.edu/events/rice_weed_course_2019.html

Forquestions,pleasecontactWhitneyBrim-DeForestat530-822-7515,orbyemailatwbrimdeforest@ucanr.edu

CreditsforPCA,QAC,QAL,PrivateApplicator:6.0other,0.5laws

CACertifiedCropAdviser:6.0IPM

UpdateyoursubscriptiontothisnewsletterNeedto…

Updateyournameoraddress?

Cancelyoursubscription?

Subscribeyouremail?

Giveusacall:530-538-7201

It is thepolicyof theUniversityofCalifornia (UC)and theUCDivisionofAgriculture&NaturalResourcesnot toengage indiscriminationagainstorharassmentofanyperson inanyof itsprogramsoractivities (Completenondiscriminationpolicystatementcanbe foundat http://ucanr.edu/sites/anrstaff/files/215244.pdf). InquiriesregardingANR’snondiscriminationpolicies may be directed to John I. Sims, Affirmative Action Compliance Officer/Title IX Officer, University of California,AgricultureandNaturalResources,2801SecondStreet,Davis,CA95618,(530)750-1397

7/26/2019

UC COOPERATIVE EXTENSION and UC DAVIS

Rice Weed Course 2019 Friday, September 6, 2019 Hamilton Road Field (on West Hamilton Rd. between Hwy. 99 & Riceton Hwy.) and Rice Experiment Station, Biggs, CA

Find out what the current weed science research is on rice. This one-day course will include training on:

1) emerging weed problems, such as red rice and winged primrose willow; 2) planning an herbicide program for susceptible and herbicide-resistant weeds; 3) hands-on early weed identification; 4) field component on new and standard herbicide programs.

Participants will tour the rice weed science research plots on West Hamilton Road then head to the Rice Experiment Station for the remaining part of the program. **BRING YOUR BOOTS** WHO SHOULD ATTEND Pest control advisors, farm advisors, chemical company cooperators, college faculty and students, and regulatory officials should not miss this event.

REGISTRATION FEE Received by

8/1/2019 Received by 8/30/2019

Received after 8/30/2019

Non-student $80 $90 $100 Current student* $50 $60 $70 *Students must provide proof of current

student status with registration form. UCCE Farm Advisor $50 $60 $70

A discounted fee (for current students and UCCE Farm Advisors) is limited to the first 5 requests. Registration fee includes handout material, light refreshments and light lunch (sandwich, drink and dessert). Space is limited to 60 people, so register early. PAYMENT Make checks payable to UC REGENTS. VISA, MasterCard, AMEX, and Discover credit cards accepted via online registration. UC account numbers also accepted. REFUND No refunds. If you are unable to attend, you may send a substitute in your place at no additional charge. CONTINUING EDUCATION CREDIT Pending approval from DPR and CCA. REGISTER Online: http://wric.ucdavis.edu and click on RICE WEED COURSE Mail your completed registration form along with your payment to: UC WEED RESEARCH & INFORMATION CENTER DEPT. OF PLANT SCIENCES, MS4 ONE SHIELDS AVENUE DAVIS, CA 95616 CHECK-IN 7:30-8:00 AM at the Hamilton Road Field (on West Hamilton Rd. between Hwy. 99 and Riceton Hwy.) in Biggs, CA PHOTO RELEASE Occasionally we use photographs of participants in our promotional materials. By virtue of your attendance, you agree to the use of your likeness in such material. QUESTIONS Contact Whitney Brim-DeForest at (530) 822-7515 or wbrimdeforest@ucanr.edu.

7/26/2019

REGISTRATION FORM Rice Weed Course 2019 Sept. 6, 2019 Hamilton Road Field, Biggs, CA

Please print. NAME (first and last name) BADGE NAME (first/nickname)

COMPANY

MAILING ADDRESS

CITY, STATE, ZIP CODE

PHONE

( ) E-MAIL

COST Received by

8/15/2019 Received by 8/30/2019

Received after 8/30/2019 Subtotal

NON-STUDENT includes handout material, light refreshments and light lunch $80 $90 $100 $

Current student* Same as above; Limited to first 5 requests.

$50 $60 $70 $

UCCE Farm Advisor $50 $60 $70 $

*Students must provide proof of current student status with registration form TOTAL $

PAYMENT INFORMATION

CHECK enclosed (made payable to UC REGENTS)

CREDIT CARD payments are accepted via the online registration system. Visit http://wric.ucdavis.edu and click on RICE WEED COURSE.

Charge my UC ACCOUNT NUMBER

CHART

3 L

ACCOUNT SUB ACCOUNT AUTHORIZED SIGNATURE

How did you hear about this event? newsletter e-mail UC Rice Blog UC Agronomy RIC website Other ______________________ trade magazine supervisor UC Farm Advisor UC Weed RIC website REGISTER BY OFFICE USE

MAIL

completed form with payment to:

UC WEED RESEARCH & INFORMATION CENTER DEPT. OF PLANT SCIENCES, MS 4 ONE SHIELDS AVENUE DAVIS, CA 95616

AMT RECD

$ CHK #

ONLINE

at:

http://wric.ucdavis.edu and click on RICE WEED COURSE

RECPT #