جستجوی مقالات مرتبط با کلیدواژه « fungal root rot » در نشریات گروه « گیاهپزشکی »

Root rot is one of the important diseases of bean in Zanjan province and two fungal pathogens، Rhizoctonia solani and Fusarium solani are the major causal agents of this disease in the region. In this research، the inhibitory effect of N-hexane، di-ethyl-ether، chloroform and ethanol extracts of five plant species، hermel (Peganum harmala)، thyme (Thymus kotschyanus)، yarrow (Achillea wilhelmsii)، pennyroyal (Mentha pulegium) and garlic (Allium sativum) on mycelial growth of R. solani and F. solani was studied using poisoned food technique at four levels of 100، 250، 500 and 1000 ppm with three replications. After laboratory experiments، the most effective extracts، were applied against bean root rot under green house conditions. According to the results from in vitro studies، N- hexane extract of thyme and pennyroyal (both at the level of 1000 ppm) had the most inhibitory effect against both pathogens and also caused cytoplasm granulation and leakage of intracellular compounds of hypha of both fungi. At greenhouse experiments، hexane extract of thyme and menthe not only significantly reduced the root rot percentage، but also had significant increasing effect on most plant growth parameters (P = 0. 05).

Fusarium root rot of bean is one of the important diseases of this plant all over the world. In order to identify Fusarium species associated with bean root rot disease in Zanjan province and their pathogenicity on bean seedlings، during growing season 2012، fifty isolates of Fusarium were obtained from roots of bean plants showing root rotand foliage yellowing or wilt symptoms. Based on cultural and morphological features by using available identification keys، seven species including F. solani، F. acuminatum، F. equiseti، F. oxysporum، F. crookwellense، F. sambucinum and F. semitectum were identified، among them F. solani was the most prevalent species. In order to compare virulence of the species، foliage disease severity and the length of necrosis lesion on root، were measured and compared among species. The effect of infection with different species on growth factors of plant consisting dried root and shoot weight، shoot and root length were also assayed. The analysis of variance showed that there was significant difference among species in terms of foliar disease severity and root lesion length. Also Pearson’s correlation analysis revealed a positive significant correlation between root lesion length and foliar disease severity.