Abstract
Potato is one of the most vegetable crops consumed in the world. Many cultivars of potato infested by Black scurf disease (Rhizoctonia solani) and affect the quantity and quality of the yield. An experiment was conducted to study the effect of clove extract for controlling R. solani. Six isolates were obtained from infected potato plants from different potato growing areas. The results obtained from the pathogenicity test cleared that lady rosetta potato cultivar was the most susceptible cultivar to R. solani as affect number of plants. While the most resistant cultivar to R. solani during the Pathogenicity test was cara potato cultivar as affected by R. solani as affect the mean number of plants. On the other hand, among all six R. solani isolates tested during the pathogenicity study Rs4 was the most pathogenic isolate on potato plants while the lowest pathogenic isolate was Rs6 on the tested potato cultivars as affecting the number of plants/ pots. The results for the effect of clove extract (alcoholic and water extract) showed that alcoholic extract was very effective to inhibit the growth of all six R. solani isolates as the pathogen was totally inhibited while clove water extract was less effective for inhibiting the growth of the pathogen comparing with control treatment.
Highlights
Potato (Solanum tubersum L.) is the most consumed crop in the world, with an estimated 374 million tons of production worldwide, with a cultivated area of about 17,623,660 hectares(Faostat, 2018)
Rhizoctonia solani is one of the most important fungal pathogen causing a great reduction in both quality and quantity of potato yield (Escande and Echandi, 1991&Jeger et al, 1996). It is responsible for delaying the emergence of stems, lesions on stems, and sclerotial formation on potato tubers (Anderson, 1982) the attacking stolons may induce the development of miss-shaped tubers (Escande and Echandi, 1991 & Jeger et al, 1996)
1.Pathogenicity of R. solani on Potato Cultivars: In this study, six isolates of R. solani were tested for pathogenicity on three potato cultivars (Spunta, Cara and Lady Rosetta) were used throughout the present study
Summary
Potato (Solanum tubersum L.) is the most consumed crop in the world, with an estimated 374 million tons of production worldwide, with a cultivated area of about 17,623,660 hectares(Faostat, 2018). The use of plant extracts for the management of black scurf disease of potato is a good alternative to chemicals due to their less negative impact on the environment (Sneh and Adams, 1996). The current study aimed to isolate the causal pathogens of the black scurf of potato, the effect of plant extracts on R. solani pathogen in vitro and in vivo.
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