兩種病害都為害茶苗，在部分茶區發生嚴重，造成茶苗枯死。
　　茶苗立枯病　常chang發fa生sheng在zai茶cha苗miao莖jing基ji部bu
，病bing斑ban初chu為wei暗an褐he色se，橢tuo圓yuan形xing或huo不bu規gui則ze形xing，以yi後hou呈cheng灰hui白bai色se，病bing斑ban稍shao下xia凹ao，其qi上shang散san生sheng許xu多duo黑hei色se的de小xiao粒li點dian。受shou害hai茶cha苗miao葉ye片pian枯ku萎wei，最zui後hou整zheng株zhu死si亡wang。該gai病bing菌jun為wei半ban知zhi菌jun亞ya門men擬ni基ji點dian黴mei屬shu(Phomopsis theae hara)zhenjun。bingbuxiaoheidianweibingjunfenshengbaoziqi，qiuxinghuobianqiuxing。neishengliangzhongfenshengbaozi
，yizhongweifangchuixingbaozi
，wusedanbao。lingyizhongweisizhuangbaozi
，shaowanquchenggouzhuang，wusedanbao。bingjunyijunsitihuofenshengbaoziqizaibingzuzhineiyuedong，cichunzaishiyitiaojianxiachanshengfenshengbaozisuifengyuchuanbo，jinxingqinranweihai。binghaizaigaowengaoshixiayouliyufashengfazhan。gaibingfangzhiyijiaqiangmiaomujianzha，jishibachubingzhuwei 最重要。其次可於發病初期噴0.7％石灰半量式波爾多液

，或50％甲基托布津1000倍液。
　　茶根癌病　以yi扡qian插cha苗miao圃pu中zhong常chang見jian
，主zhu側ce根gen均jun可ke受shou害hai。病bing菌jun從cong扡qian插cha苗miao剪jian口kou或huo根gen部bu傷shang口kou侵qin入ru，初chu期qi產chan生sheng淡dan褐he色se球qiu形xing突tu起qi，以yi後hou逐zhu漸jian擴kuo大da呈cheng瘤liu狀zhuang，小xiao的de似si粟su粒li
，大da的de象xiang豌wan豆dou，多duo個ge瘤liu常chang相xiang互hu愈yu合he成cheng不bu規gui則ze的de大da瘤liu。瘤liu狀zhuang物wu褐he色se
，木mu質zhi化hua而er堅jian硬ying，表biao麵mian粗cu糙cao。茶cha苗miao受shou害hai後hou須xu根gen減jian少shao，地di上shang部bu生sheng長chang不bu良liang或huo枯ku死si。茶cha根gen癌ai病bing菌jun為wei野ye杆gan菌jun屬shu[agrobacterium tumefaciens(S.et T．) Conn．]細菌。菌體短杆狀
，具1～3根極生鞭毛。在普通培養基上形成灰白色圓形菌落。發育適溫為25～29℃
，致死溫度為51℃(10分鍾)。在ph7.3時發育最好。根癌病菌在土壤或病組織中越冬。次年環境適宜時，借水流、dixiakunchongjinongjuchuanboweihai。bingjuncongmiaomushangkouhuoqiekouchuqinru，zaizuzhineishengchangfayu，cijixibaojiasufenlie
，chanshengailiu。gaibingfangzhiyaoyangemiaomujianzha

，fangzhidixiahaichong，jianshaogenxishangkou。miaomubiyaoshikeyong20％石灰水浸根10分鍾消毒後再移栽。