培pei養yang健jian壯zhuang的de樹shu勢shi對dui於yu抵di禦yu病bing蟲chong和he自zi然ran災zai害hai至zhi關guan重zhong要yao，也ye是shi預yu防fang病bing蟲chong自zi然ran災zai害hai的de根gen本ben措cuo施shi。樹shu跟gen人ren一yi樣yang，生sheng活huo中zhong，我wo們men看kan到dao有you些xie人ren一yi般ban不bu得de病bing

，即ji使shi有you個ge小xiao病bing小xiao災zai的de扛kang幾ji天tian就jiu過guo去qu了le，而er有you些xie人ren一yi年nian四si季ji藥yao不bu斷duan，小xiao小xiao的de感gan冒mao也ye得de住zhu院yuan，這zhe就jiu是shi體ti質zhi的de問wen題ti。在zai果guo樹shu上shang就jiu是shi樹shu勢shi的de問wen題ti，樹shu勢shi強qiang健jian，對dui各ge種zhong病bing蟲chong自zi然ran災zai害hai抵di抗kang能neng力li強qiang
，別bie的de樹shu發fa病bing它ta不bu發fa，別bie的de樹shu病bing重zhong它ta輕qing，甚shen至zhi對dui一yi些xie化hua學xue藥yao劑ji無wu法fa防fang治zhi的de病bing害hai
，諸zhu如ru病bing毒du病bing也ye有you很hen好hao的de抵di抗kang能neng力li。對dui一yi些xie凍dong害hai
、冰雹災害等，其他措施很難防禦，而增強樹勢卻能直到很好的抵禦作用。

在果樹生產中，我們常常看到這樣的情況：tongyangdefulanbing
，yongtongyangdeyao
，youdeshujiunengfangdezhu，eryoudeshufangleyoufufa

，shenzhizuihousishu。tongyangdehuayebing，youxieshuhuibuduanmanyan，eryouxieshuquezhujianjianshao。suoyi

，womenyingchangtingzhuanjiajiangbingchongzaihaifangzhijishu，guanjianshiyaozengqiangshushi
，yinweizheshizuiweigenbendebanfa，yeshizuiweilvsehuanbaodebanfa。