Lettuce Best Practice - Department of Primary Industries

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Farm Services Victoria 22Critical Comments: Seedling drenches can affect beneficials and affect IPM. WFT is a critical vectorfor Tomato spotted wilt virus (TSWV) and where both are found, an integrated management approachis critical.Infestation Risk Factors Cultural Practices Chemical Control Conflicts /IssuesEffective IPM Rating √ √ √ √ √Increases theriskConsiderweatherconditions andsurroundingcrops and weedhosts.Warm weatherincreases thripsnumbers.Reduces theriskNursery fullyinsect-screened(thrips-proofscreen) anddouble doorsprevent insectentry.Ensuretransplants arefree of pest.Control weedsin crop andheadlands.MonitoringControlThresholdsYellow or bluesticky trapsshould be usedin coveredsystems andcan be usefulin field crops.Visuallymonitor cropfor thripsnumbersand virussymptoms.Virus-infectedplants shouldbe physicallyremoved anddestroyed.Western Flower Thrips (WFT)Frankliniella occidentalisBeneficialInsectsImportant toensure goodspray coverage.Immediatelyafter harvestspray off orcultivateand ploughin lettuce todestroy cropresidue.Other Pest Lifecycle Chemical IPM IssuesSoil predatorymites∙∙Predatorythrips∙∙SomepredatorybeetlesBeneficialpredators arecommerciallyavailable.Lifecycle isquicker in warmweather.The fulllifecycle can becompleted inas little as 10days at 20°C.Sprays onlyeffectiveagainst certainlifecyclestages. Goodhygiene in andaround thecrop minimisespest pressure.The seedlingdrench forCurrant lettuceaphid willcontrol somethrips speciesbut not WFT.Use a rangeof chemicalgroups toreduce thechance ofresistanceDifficult toidentify withthe naked eyefrom otherthrips.WFT hasshown itselfto be quickto developinsecticideresistance.Spinosadresistantpopulationsexist in someproductionareas.Can spreadTomato SpottedWilt Virus(TSWV).Insecticidalseedlingdrenchescan affectbeneficialinsects andaffect an IPMprogram.
Infestation Risk Factors Cultural Practices Chemical Control Conflicts /IssuesIncreases theriskReduces theriskMonitoringControlThresholdsBeneficialInsectsOther Pest Lifecycle Chemical IPM IssuesSurroundingweeds andother crops(e.g. tomatoor floweringcrops) canbe a sourceof WFT andmay increasethe risk ofa residentresistantpopulation.Previous plantvirus infectionof crops maymake controlmore critical.Hygiene andend of cropclean-upcritical.Some newchemistry isclaimed tobe soft onbeneficials.Lettuce Best Practice 23
Page 1 and 2: Lettuce Best PracticeIntegrated Pes
Page 5: What is IPM (Integrated Pest Manage
Page 8 and 9: Farm Services Victoria 4The number
Page 10 and 11: Farm Services Victoria 6Generic IPM
Page 12 and 13: Farm Services Victoria 8Weed contro
Page 14 and 15: Farm Services Victoria 10Effective
Page 16 and 17: Farm Services Victoria 12Currant le
Page 18 and 19: Farm Services Victoria 14CutwormAgr
Page 20 and 21: Farm Services Victoria 16Critical C
Page 22 and 23: Farm Services Victoria 18Loopers an
Page 30: Farm Services Victoria 26Wireworm /
Page 33 and 34: ResistantvarietiesavailableRotation
Page 42 and 43: Farm Services Victoria 38Septoria s
Page 44: Farm Services Victoria 40NematodesM
Page 47 and 48: Infestation Risk Factors Cultural P
Page 49 and 50: Host plantscontinuedKey controlinfo
Page 51 and 52: Transplant through tovegetative gro
Page 53 and 54: Method of control for aweed free se
Page 55 and 56: Broadleaf weedsThe most significant
Page 57 and 58: Rotation Crop Cultural Practices Co
Page 59 and 60: Identification of Insects, Spiders
Page 61 and 62: Scouting Protocol for Lettuce incor

Lettuce Best Practice - Department of Primary Industries

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