In 39-42, find parametric equations for an object that moves along the ellipse :- + = 1 with the motion described. The motion begins at (0, 3), is coun terclockwise, an d requires1 second for a complete revolution.
Rabbit 23March2016-PlantPathology-Dr.Lawrence-AuburnUniversity Tobaccomosaicvirus • finaltest(knowit’savirus) • mottlingofleaves • NEVERwillfindasign;nosignbecausevirusparticlessotiny • severesymptoms • moresevereonyoungertissue • nocureforit • seeddiscolorationblackhilumspreads • control:sanitation,avoidhostfor2years,biocontrol,milk(denaturestheproteins), resistantvars • diseasecycle:phloemmovementissystemic,staysinleavesforyears,easilyspread, Wheatmosaicvirus(Furoviruses) • protozoavectors • wheatmosaic,peanutclump • patches,mottlingandrings,rootshaveexcessivebranching,reducedyield,canlook undermicroscopeforit, • overwinterinvectors,transmittedbyzoospores,limitedtoroots,somemoveinthe xylemNOTthephloem • control:sanitation,virusfreeseed Filamentousviruses:PotatoVirusX(mechanical) • Potexciruses:singleflexuousrod,celltocellmovementofprotein • attackorchids,affectmanycrops,losses,stunting,discoloration,NOvectors, transmittedbycontact,transmittedinlegumesaretransmittedbyseed • control:virusfreepropagativematerial Potyviruses:PotaoVirusY(aphids) • largestgenusofplantviruses • beancommonmosaicvirus,lotsofdifferenthosts,singlerod • symptoms:mosaics • transmittedbyaphids • nonpersistent(afternoon) • overwintersinperennialhostsorseed,longeritispresentthegreaterthelosses • control:resistantvarieties,virusfreeseed,insecticideskillaphids!,KILLFASTAND EARLY Cucumbermosaicvirus • worldwide,infectsmorevarietyofanyothervirus,mosaic,stuntingleafandfruit malformations • vegetablesaffectedcommoningardens • isometricparticlesshapedpackedintightly Rabbit • overwinterandaphidstransmitvirusesNONPERSISTANT • mechanicallytransmittedbyhandlinginfield • control:virusfreetransplants,resistantvarieties,removalofwildhosts • crossprotection:avirulentstrainofavirus Tomatospottedwiltvirus(Tospoviruses) • widespread,ornamentalsinfected,widehostrange500species,isometricparticle • sphericalparticles • hasmembrane • symptoms:vary,chloroticandnecroticrings,fruitsmalformed,stuntedgrowth • NOSIGN • affectstobacco,too:severe:raggedappearance • transmittedbythrips • larvaegetthevirus,KEEPthevirusevenpastpupation,adulttransmititafterfeeding for30mins • control:virusfreetransplants,thripscontrol,transgenicplants • avoidplantingwhenthripsareactiveinseason note:NOcottonvirusesinNorthAmericasofar KnowSigns: Fungal,bacterial,virus,nematodedamage(haven'tcoverednematodesyet) FridayMarch252016:moregeneralinformationandvideoonviruses NOCLASS
