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近年来,一种严重危害重庆万州红桔的真菌性病害大规模流行,已成为生产上亟待解决的难题.该试验取田间病果、病叶及病枝样本进行发病组织培养和菌株分离纯化,根据病原菌的形态特征和致病性进行种类鉴定,并选用19种杀菌剂分别对致病病原菌进行抑菌活性测定.结果表明:重庆万州红桔上发生的病害为以褐斑类病原菌危害为主的复合型病害,致病病原菌为交链格孢菌Alternaria Nees ex Wallr.和炭疽病菌Colletoirichum gloeospori-oides Penz..不同药剂对两种致病病原菌菌丝生长的抑制作用的差异具有统计学意义.其中25%腐霉.福美双600倍、25%咪鲜胺750倍、60%甲硫.异菌脲500倍、拿敌稳(肟菌脂25%.50%戊唑醇)3 000倍等杀菌剂对两种病原菌的抑菌率达100%,凯润(吡唑醚菌酯250g/L)2 000倍对两种病原菌的抑菌率也达90%以上.根据室内抑菌药剂筛选结果、防治用药成本和抗药性等综合因素考虑,推荐25%咪鲜胺可湿性粉剂750倍为生产上化学防治首选药剂,混用、轮用药剂可选择上述其他药剂及药剂组合.
In recent years, a serious epidemic of Wanzhou red orange fungus diseases in Chongqing has become a problem to be solved urgently.This experiment took field disease fruit, diseased leaves and diseased branches pathogenic tissue culture and strain isolation and purification, According to the morphological characteristics and pathogenicity of the pathogenic bacteria, the species identification was carried out, and 19 kinds of fungicides were selected to test the antibacterial activity of the pathogenic bacteria.The results showed that: , And the pathogenic bacteria were Alternaria Nees ex Wallr. And Colletoirichum gloeospori-oides Penz .. The differences of the inhibitory effects of different agents on mycelial growth of two pathogenic pathogens were statistically significant. Among them, 25% of Pythium, 600 times of thiram, 750 times of 25% prochloraz, 500 times of iprodione and 500 times of amikacin (with 25% and 50% of tebuconazole) The bacteriocidal bacteriostasis rate of the two pathogens is up to 100%, and the bacteriostasis rate of Kairun (pyraclostrobin 250g / L) is more than 90% to the two pathogens.According to the screening results of indoor bacteriostats , Prevention and treatment of drug costs and drug resistance and other comprehensive factors Consider, recommended 25% Prochloraz WP 750 times the production of chemical prevention and treatment of choice for the pharmaceutical, mixing, round of the agent can choose the other agents and pharmaceutical combinations.