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Efficacy of fungicides against pea root rot/wilt complex pathogens in Himachal Pradesh

机译:杀菌剂对喜马偕尔邦豌豆根腐病/枯萎病复合病原体的功效

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摘要

Pea root rot/wilt complex is a highly destructive disease and is found to be associated with more than 20 different fungal pathogens around the globe (USDA, 1960). Among those pathogens Fusarium oxysporum, F. solani, Sclerotinia sclerotiorum, Rhizoctonia solani and Phoma medicaginis var. pinodella have been reported to be associated with this complex disease of the pea in Himachal Pradesh (Sagar, 1996; Kapoor etal, 2006). Disease incidences varied from 35.3 to 54.7 area to area/area-wise within the state (Kumari et ai, 2016). Pathogens associated with pea root rot/wilt complex are soil borne in nature and it affects crop at the pre-flowering or flowering stage. The disease initiates with the disintegration/rotting of tissues around the attachmentarea of cotyledon, and then proceeds downward up to tap root which leads yellowing of basal leaves, vascular discoloration and ultimately wilting of the infected plants. This disease is referred to as a root rot/wilt complex disease due to the presenceof a mixture of both wilting and rotting symptoms in the plant (Lin et al., 1984). Fusarium species are generally opportunistic and requires plant stress to cause severe infections (Leslie et al., 1990) and often overwinter inside and on crop residues (Larkin, 2015). Conditions like compact soil, high soil temperatures, high soil moisture levels and flooding or drought favor disease development (Tu, 1994). Monoculture (Anonymous, 2005), lack of knowledge of package and practices (Kumar, 2013), use of susceptible cultivars (Kapoor, 2006), and soil borne nature of pathogens are the major constraints for pea production and also for the management of disease in HP. Hence, the present experiment is conducted to know about the effective fungicides that can protect the crop from the development of the pathogens.
机译:豌豆根腐病/枯萎病复合物是一种极具破坏性的疾病,被发现与全球 20 多种不同的真菌病原体有关(美国农业部,1960 年)。据报道,在这些病原体中,尖孢镰刀菌、茄镰刀菌、菌核病菌、茄根瘤菌和药用豌豆变种与喜马偕尔邦的这种复杂豌豆病有关(Sagar,1996年;Kapoor etal,2006 年)。该州内的疾病发病率从35.3%到54.7%不等(Kumari等人,2016)。与豌豆根腐病/枯萎病复合物相关的病原体是自然界中土壤传播的,它在开花前或开花阶段影响作物。该病始于子叶附着区周围组织的崩解/腐烂,然后向下向上发展到主根,导致基部叶片变黄、维管变色并最终导致受感染植物枯萎。由于植物中同时存在枯萎和腐烂症状的混合物,这种疾病被称为根腐病/枯萎复合体病(Lin等人,1984)。镰刀菌属通常是机会性的,需要植物胁迫才能引起严重感染(Leslie等人,1990),并且经常在作物残茬内部和作物残茬上越冬(Larkin,2015)。土壤紧实、土壤温度高、土壤湿度高、洪水或干旱等条件有利于疾病的发展(Tu,1994)。单一栽培(Anonymous,2005),缺乏包装和实践知识(Kumar,2013),易感品种的使用(Kapoor,2006)以及病原体的土壤传播性质是豌豆生产的主要制约因素,也是HP疾病管理的主要制约因素。 因此,进行本实验是为了了解可以保护作物免受病原体发展的有效杀菌剂。

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