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i <br /> 1 Step Five: If pests exceed fhe 4olerance thresholds <br /> ( U:c eultur�l, physical, tnechanical oi Uiologica] controls lir�t. ], thc„c <br /> pro.�e insuffieient, use the chemica] contrals described belo�e that ha�e th� <br /> least non-target impact. \Vhen a pest outbrcak strikes (or monitorin� <br /> � sho�vs one is imminent), imp]emenl ll'NI then caisider control options th;u <br /> are the ]east to�ic, or have tl�e Ieast non-targct impact. Hcrc are t�ao <br /> csamples of an IPA1 approach: <br /> v1. Red thrcad disease is most likely under lo�e nitrogen fenilnt� <br /> conditions and most severe during slow growth condicions. Iv1ot+ and <br /> a bag the clippings to remove discased blades. Pertilize lighily to hclp <br /> � tlie grass recover, then Uegin grasscycling and changc to fall <br /> fertilization �+�ith a slow-rclease or natural-organic fenilizer to pro��idc <br /> � an even supply of nutrients. Chemical fungicides are not <br /> nconunended because red thread cannot kill the lawn. <br /> 2. Crane ily damagc is most prcvalcnt on la�ans that stay wct in thc <br /> ' winter and are irrigated in the surtuncr. Correct the w�inter drain�ec <br /> and/or allo��� the soil to dry between ircigation cycles; lan�ae are <br /> susceptiUle to drying out so thcse changes can reduce their numhers. h <br /> � may also be possible to rcducc cranc fly larvae numbcrs by usin� a <br /> power de-tliatcher on a cool, doudy day when fecding is occurrin� <br /> close to the surface. Swdies are being conducted using benefici��l <br /> � ncmatodes Qiat parasitize tlie crane fly larvac; this type of trcai�ucnt <br /> may cventually be a reasonable altcrnative. <br /> I Only after trying suitable non-chcmical conmol methods, or dctcmiining <br /> that the pest outbrcak is causing too much serious damage, should <br /> chemical controls be considcred. Swdy to detemiine �vhat products arc <br /> � available and choose a product tliat is the ieast toxic and has the least non- <br /> targct impact. Refer to Qie Operational B�9Ps for the usc of Pesticidcs <br /> below for guidclincs on choosing, storing and using la�vn and gardcn <br /> � chenticals. <br /> Step Six: Evaluate and record the effectiveness of the control, <br /> I and modify maintenance practices to support lawn or <br /> landscape recovery and prevent recurrence. <br /> � Keep records! Note when, �cherc, and what symptoms occuRed, or �ti hen <br /> � monitoring rcvealed a potential pest problem. Note �vhat controls werc <br /> applicd and when, and thc cffcctivcncss of thc control. Monitor ncxt ycar <br /> :or thc same proble:ns. Revie��� ��aur landscape mainten�nc� anrl cnl!nr.^.! <br /> practices to see if tUey can be modificd to prevent or reduce Qie problem. <br /> January 2005 Volume IV—Source Control(Pollulron Prevenfion) BMPs F•3 <br /> ( <br /> � � U� <br />