Bioactivity of Fusarium oxysporum f. sp. glycines and Sclerotium rolfsii filtrates on egg hatching, survival and infectivity of juveniles of Meloidogyne incognita race 2
O. K. Adekunle A and O. A. Akinsanmi A BA Department of Plant Science, Obafemi Awolowo University, Ile-Ife, Nigeria.
B CRC for Tropical Plant Protection, The University of Queensland, 80 Meiers Road, Indooroopilly, Qld 4068, Australia. Corresponding author. Email: Olufemi.Akinsanmi@dpi.qld.gov.au
Australian Journal of Experimental Agriculture 45(1) 99-102 https://doi.org/10.1071/EA02129
Submitted: 4 August 2002 Accepted: 2 April 2004 Published: 21 February 2005
Abstract
The effects of culture filtrates of Fusarium oxysporum and Sclerotium rolfsii on egg hatching and juvenile survival of Meloidogyne incognita in vitro and impact of these filtrates on infectivity of M. incognita were investigated on soybean seedlings. Five- and 10-day-old filtrates of F. oxysporum caused 65 and 54% egg-hatching inhibition, while that of S. rolfsii caused 61 and 49% inhibition, respectively. Juveniles of M. incognita died within 6 days when incubated in 5-day-old filtrate of F. oxysporum, while the similar filtrate of S. rolfsii caused 100% juvenile mortality on the fifth day. Filtrates reduced root galling, egg population, number of adult females in soybean plants at harvest and also soil population. Culture filtrates could be used as source of biological nematicides.
Additional keywords: root-knot nematode, culture filtrates.
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