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本试验以7个南瓜砧木品种为材料,通过调查土壤根际根结线虫数、砧木与接穗的亲和力和接穗黄瓜产量,进行品种比较。结果表明,土壤根际根结线虫数差异显著,砧木247、242、229的土壤根际根结线虫数少,219和221次之,CK和北京砧木多;砧木与接穗的亲和力也存在显著差异,242、229、247和CK较强,北京砧木、221和219较差;单株接穗黄瓜产量和结瓜数以242、247和229最高,北京砧木和221次之,CK与219最低。参试7个品种中,242、247、229综合性状表现良好,抗病性、砧木与接穗的亲和性以及单株产量均优于对照,可以作为黄瓜抗根结线虫砧木在栽培中推广应用。 相似文献
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为明确烟草麻孢根腐病菌Gelasinospora reticulata的生理学特性及对杀菌剂的敏感性,采用十字交叉法和血球计数法研究了不同培养条件对该病菌菌丝生长的影响,并测定了11种不同杀菌剂对病菌的抑制作用。结果表明,该菌菌丝生长和产生子囊孢子的最适宜温度为26~32℃,最适生长pH为4;光照对菌丝和子囊孢子生长有明显的抑制作用;相对湿度高有利于该菌子囊孢子的萌发,当相对湿度高于98%时,萌发率达100%;温、湿度交互作用中,温度和相对湿度分别是影响菌丝生长和子囊孢子萌发的主要因素;不同碳源和氮源对菌丝生长及干重的影响差异显著,其中葡萄糖与酵母膏分别为最适宜碳源和氮源;病菌菌丝体和子囊的致死温度分别为51℃和55℃。咪鲜胺对该菌的抑制效果最好,EC_(50)为1.26μg/mL,其次是吡唑·醚菌酯,EC_(50)为2.78μg/mL,而代森锰锌、丙森锌、三唑酮和代森联抑制作用较差,不适合用于防治烟草麻孢根腐病。 相似文献
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Ginger (Zingiber officinale Roscoe) is an important economic crop in China. Bacterial leaf spot disease is the major limiting factor for the ginger crop production in Shandong. In recent years, a bacterial leaf spot disease was observed on ginger in Laiwu and Anqiu, that became a major limiting factor in ginger production. Yellowish bacterial colonies that were obtained after incubation at 28°C for 2 days from infected leaves were purified by streaking on nutrient agar. The purified isolates were initially identified as Pantoea ananatis by the phenotypic and biochemical characterization. Further molecular identification based on the 16S rDNA sequence analysis and multilocus sequence analysis with the gyrB, rpoB, and atpD sequences confirmed that the isolates were P. ananatis. To our knowledge, this is the first report of bacterial leaf spot of ginger caused by P. ananatis in Shandong. Our study will provide basic references for disease management of this pathogen. 相似文献
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