Pathogenicity of root-knot nematode (Meloidogyne incognita) on sweet potato (Ipomoea batatas L.) – IJAAR

sweet-potato-1f1p414O.S. Osunlola, B. Fawole

Department of Crop Production, Kwara State University, Kwara State, Nigeria

Department of Crop Protection and Environmental Biology, University of Ibadan, Ibadan, Nigeria

Key words: Sweetpotato, Meloidogyne incognita, pathogenicity, growth, yield.

Abstract

Root-knot nematode, Meloidogyne incognita, is a major biotic factor militating against sweet potato production. The pathogenicity of M. incognita on three sweet potato cultivars: Kayode, TIS 4400-2 and TIS 70357-OP-1-79 was investigated in a screen house experiment at the Department of Crop Protection and Environmental Biology, University of Ibadan, Ibadan, Nigeria. A vine cutting of each cultivar was planted in a 16 litre polyethylene pot containing 15 litre steam-sterilized sandy loam soil. Three weeks after planting, the seedlings were inoculated separately at four inoculum densities: 0, 30,000, 60,000 and 90,000 eggs of M. incognita using a 3 x 4 factorial experiment replicated four times in a randomized complete block design. 468557620_xsData were collected on fresh shoot weight, fresh root weight, dry shoot weight, dry root weight, galling index, tuber yield, tuber quality and nematode reproduction. All data were analyzed using ANOVA (p<0.05). M. incognita significantly (p<0.05) reduced the fresh shoot weight by 16.3-23.6%, fresh root weight by 28.3-62.3%, number of tubers by 63.2-69.2% and tuber yield by 72.3-83.2%. The gall index and the final nematode population increased with increase in inoculum density. The result showed that M incognita caused growth, yield and quality reduction in sweet potato; therefore, management of root-knot nematode should be part of sweet potato production efforts especially in areas where the nematode is endemic.

ijaar-v6no2-p47-53Get the original articles in Source: Volume 6, Number 2, February 2015 – IJAAR

Journal Name: International Journal of Agronomy and Agricultural Research (IJAAR)

Published By: International Network for Natural Sciences

Related Post: The effects of soil organic matter content and soil texture on the population number of Pratylenchus loosi, in tea plantation of Iran – IJAAR

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