Resistance to thiabendazole inFusariumspecies isolated from potato tubers affected by dry rot

Abstract

Fusarium species obtained from stored potato tubers affected with dry rot were grown on agar containing thiabendazole. All 40 isolates of F. coeruleum and 60 isolates of F. avenaceum tested were sensitive to the fungicide, but 68% of the 85 isolates of F. sulphureum and one isolate of F. culmorum were classified as resistant. When isolates were made from dry rots on tubers that had been treated with thiabendazole during loading into store, all 81 isolates of F. sulphureum were resistant, whereas all the isolates of F. coeruleum (25), F. avenaceum (4) and Phoma foveata (10) were sensitive. Resistance was not found in five isolates of Cylindrocarpon destructans. All the Fusarium spp. were sensitive to imazalil and were pathogenic when inoculated into potato tubers. Resistant and sensitive isolates of F. sulphureum caused rots of similar size.

Pre and Post Harvest Diseases of Potato and Their Management

“…F. solani var. coeruleum ) is considered to be the predominant causal agent in the United Kingdom (Hide et al 1992 ;Peters et al 2004 ) and F. oxysporum Schlechtend in plains of India (Singh et al 1987a ). Other pathogenic species associated with dry rot include F. avenaceum (Fr.)…”

“…Sacc., F. acuminatum Ellis & Everh. (Hide et al 1992 ). Recently, F. sambucinum has been reported to cause dry rot of potatoes in cold stores in India (Fig.…”

Non-Dependency of In Vitro Fungicidal Efficiency of Copper Nanoparticles against Fusarium oxysporum upon Particle Size

“…On the other hand, many phytopathogens have developed resistance against a lot of traditional chemicals used to control such phytopathogens [2][3][4][5][6][7][8][9][10][11][12][13][14], which in turn spur farmers to use larger quantities of such chemicals to in order to control the more resistive pests, which result in dangerous health consequences and more pollution hazards on the environment. So, it is hoped that new technologies, such as nanotechnology, may provide more efficient, cost-effective, and eco-friendly nanocides for controlling such pathogens.…”

Variation in pathogenicity on potato tubers and sensitivity to thiabendazole of the dry rot fungusFusarium avenaceum

“…Control on stored tubers is principally by application of the fungicides thiabendazole or imazalil. Sensitivity of the pathogens to thiabendazole is variable and the development of decreased sensitivity, resulting in control failures, has been reported (Hide et al, 1992: Desjardins et al. 1993.…”

“…coeruleum) is the main cause of dry rot in the UK whilst F. avenaceum, which is considered less common (Brenchley & Wilcox. 1979: Hide et al, 1992, and F. sulphureum (=F. sambucimlm) are frequently identified as dry rot pathogens (Hide et al, 1992).…”