zhiwubinghaidefashengfazhan，shouxuduoyinsudezongheyingxiang，gezhongyinsuyouliyubinghaifashenghefazhan，jiuhuidaozhibinghaizaifasheng。binghaipubianeryanzhongfashengchengweibinghailiuxing。
（二）影响病害流行的因素
1、jishengwuzhong zhiganbingdepinzhong，shibinghailiuxingdexianjuetiaojian。
2、bingyuanwu bingyuanwushibinghailiuxingdeyouyijibentiaojian。
3、huanjingtiaojian yubinghailiuxingyoujiaodaguanxidehuanjingtiaojianshiwendu、shiduheyushui。
4、zaipeiguanli gengzuozhidudegaibian，jiugaibianlenongyeshengtaixitongzhonggeyinsudexianghuguanxi，wangwanghuiyingxiangbinghaideliuxing。
（三）病害流行的类型和变化
1、病害流行的类型
（1）jinianliuxingbing zheileibinghaizhiyouchuqinran，meiyouzaiqinran，huosuiyouzaiqinran，danzaidangnianbinghaifashengdeguochengzhongsuoqidezuoyongbuda。
（2）dannianliuxingbing zheileibinghaiyouduocizaiqinran，zaiyigeshengzhangjijiezhongbinghaijiukeyiyouqingdaozhongdadaoliuxingchengdu。
2、病害流行的变化
（1）jijiebianhua jijiebianhuashibinghaizaiyigeshengzhangjijiezhongdexiaozhangbianhua。
（2）nianfenbianhua nianfenbianhuashizhiyizhongbinghaizaibutongnianfenfashengchengdudebianhua
（四）病害的监测和预报
binghaiyuceyubaodeyiju，zhuyaoshigenjubinghaifashengheliuxingdeguilv。
1、zhangqiyubao shizhizaijiaozhangshiqizhiqianduibinghaifashengjinxingyubao
2、duanqiyubao shizaibinghaifashengqianbujiuhuobinghaifashengdechuqiduiduanqineibinghaikenengfashengdequshihechengduzuochuyubao
