推荐回答(5个)
鸡白痢是由沙门氏杆菌引起的鸡常见传染病,初生雏鸡的发病率和死亡率均很高。成年鸡多为慢性或隐性感染。主要传播方式是母鸡通过种蛋传给雏鸡。 临床症状:病雏表现为精神不振,食欲废绝,羽毛逆立,两翅下垂、怕冷、常堆挤在一起,白色下痢,其粪便常粘在肛门周围羽毛上,堵塞肛门,不能排粪。有的雏鸡出现关节肿胀、跛行。 剖检变化:可见卵黄吸收不全,其内容物呈炎黄色,象豆腐渣一样。母鸡卵泡变形,颜色灰暗。公鸡睾丸萎缩,呈青灰色。肝、肺、心、盲肠、大肠及表面有灰白色坏死点或坏死结节,盲肠腔有干酪样物充塞。 防治方法: A、种鸡场必须适时地进行检疫,检疫的时机以140日龄左右为宜,及时淘汰检出的所有阳性鸡。 B、种蛋入孵前要熏蒸消毒,同时要做好孵化环境、孵化器、出雏器及所有用具的消毒。 C、加强育雏期的饲养管理,保证育雏温度、湿度和饲料的营养。育雏早期要用敏感药物进行预防。 D、发病后在饲料中添加敏感药物治疗,常用百病消、氯霉素、痢特灵、氟哌酸和吡哌酸。
斜纹夜蛾是一种食性很杂的暴食性害虫,在茄果类蔬菜中主要危害番茄。刚孵化的斜纹夜蛾幼虫常常群集于卵块的附近啃食叶肉,将叶背上的叶肉啃食成纱网状,仅留下表皮和叶脉;2龄以后开始分散为害,而5~6龄期为暴食期,每头幼虫可为害7~10个果实,占幼虫总食量的96%。被为害后的番茄不能食用,故严重影响产量。
斜纹夜蛾在华南地区可终年繁殖,无越冬问题;长江流域的虫源极有可能是从南方迁移而来。在浙江省,斜纹夜蛾一年可发生5~8代,并于7~9月间盛发。斜纹夜蛾发育最快的温度为29~30℃,8月下旬为害最为严重,故称为高温害虫。斜纹夜蛾成虫于夜间活动,有较强的飞翔能力,一次可飞数十米远,高达10米以上;成虫有趋光性,并对糖、醋、酒液及发酵的胡萝卜、麦芽、豆饼、牛粪等有趋性。卵多产于叶背面,每头雌成虫平均产卵3~5块,每块有卵100~200枚,在平均气温25℃时,卵期5~6天。幼虫共6龄,初孵化的幼虫群集食叶肉,并留下表皮和叶脉,在田间很容易观察到,4龄以后的幼虫进入暴食期,并多数于傍晚出来为害。
对斜纹夜蛾的防治主要采用以下3条措施:
(1)诱杀成虫。
诱杀的方法主要是采用黑光灯捕杀,或用糖醋液诱杀:糖6份、醋3份、白酒1份、水10份、90%敌百虫1份调匀。近年来,利用性诱捕器诱杀斜纹夜蛾雄蛾技术已经普遍推广。
(2)采摘卵块和人工捕捉幼虫。
可利用成虫集中产卵的特点,采摘卵块;也可利用1~2龄幼虫群集为害的特点,摘除卵块;此外,还可采用人工捕捉大龄幼虫的方法。将上述摘除的卵块或幼虫集中销毁。
(3)药剂防治。
可用10%安绿宝1500倍液,20%除虫脲悬浮剂1500~2000倍液,5%抑太保+5%卡死克乳油1000~1500倍液,5%锐劲特1500~2000倍液,10%除尽悬浮剂1000~1500倍液,52.25%农地乐乳油1000~1500倍液,0.5%蔬果尽乳油500倍液,25%搏杀特4000倍液,8010杀虫菌500~800倍液,25%杀虫双水剂500倍液+敌敌畏乳油1000倍液喷雾,48%乐斯本乳油800~1000倍液等。药剂防治的时间应掌握在1~2龄期,3龄以上的幼虫分散蛀入果内,防治效果大大下降。
鸡白痢由鸡白痢沙门氏菌引起,主要侵害雏鸡,以白痢为特征,雏鸡患病后,多在两周内大量死亡。
养鸡的全过程都可造成鸡白痢的发生和流行。防治本病首先要做好种鸡的检疫净化,其次是做好对环境、饲料、饮水的卫生防护以及对种蛋、孵化过程中的消毒工作。
白痢、大肠杆菌……原因很多 你最好上些抗病毒药和治疗肠炎或大杆的
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