《侵染性病害-甘蓝和甘薯》

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1、甘蓝病毒病病原TuMV（曲顶病毒），CMV（黄瓜花叶病毒）症状苗期发病，叶脉附近的叶肉黄化，并沿叶脉扩展。有的叶片上出现直径2～3毫米圆形褪绿黄斑或褪绿小斑点，迎光检视非常明显，后变为浓淡相间的绿色斑驳。成株发病，嫩叶表现浓淡不均斑驳，老叶背面有黑褐色坏死环斑，后期容易穿孔。发病规律一般在高温干旱条件下发病重，尤其是土壤温度高时更易发病。在适宜的气温条件下，土壤温度在30℃时比15℃时发病率高1倍。甘蓝与十字花科蔬菜邻作，病毒会相互传染，加重病情。防治方法①种子消毒播种前用10％的磷酸三钠溶液浸种20分钟

2、，用清水洗净后再播种。或将种子用冷水浸4～6小时，再用1.5％植病灵1000倍液浸10分钟，捞出直接播种。有条件时，可将干燥的种子置于70℃恒温箱内进行干热消毒72小时。②防治蚜虫在畦间悬挂或铺银灰色塑料薄膜可有效地驱避菜蚜，必要时喷药杀蚜，减少传毒媒介。③药剂防治Opinionsandsuggestionsontheparty'smasslineeducationalpracticeAccordingtothecentralandprovincial,municipalunifieddeployment

3、,accordingtomunicipalPartycommittee"aboutcarryingouttheparty'smasslineeducationalpracticeactivityinthecity'simplementationopinions,thespiritoftheparty'smasslineeducationalpracticeactivitiesfrom20**inJanuaryto99months,carriedoutatalllevelsofdepartmentsandd

4、irectlyaffiliatedinstitutionsandgrass-rootspartyorganizations.AccordingtomyactualCounty,thecountytocarryouttheeducationpracticeputforwardthefollowingimplementationopinions.First,theoverallrequirementsCountycountyeducationpracticetotheeighteenPartyofeight,

5、thespiritofthethethirdPlenarySessionofthe18thCPCCentralCommitteeastheguidance,conscientiouslyimplementthespiritofgeneralsecretaryXiJinpingbookseriesofimportantspeech,earnestlyimplementtheCentralCommitteereally,opinionsandadvice><<>,

6、idingideologyofopinionstodeterminetheobjectivesandrequirements,stepmethod,inaccordancewiththe""lookinthemirror,dressup,washbath,curetreatment,thegeneralrequirementsof"forthepeoplepragmatichonestpeopleasthetheme,incarryingforwardthespiritofZhuanglangZhuang

7、,improvetheirworkstyle,servicetothemassesofthepeople,thefoundationofconsolidatinggrassroots,promotetransformationacrossefforts,tofurtherimplementthecentraleightregulationsand

8、ialregulations,municipalprovisionsofthe"twelve"planandtheimplementationmeasuresfor