1Crop Protection Unit, Directorate of Groundnut Research (DGR), Junagadh-362001, Gujarat, India
2Centre for Conservation and Utilisation of Blue Green Algae (CCUBGA), Indian Agricultural Research Institute (IARI), New Delhi-110 012, India
*Corresponding author, E-mail: prasannaiari@gmail.com
Online published on 22 July, 2013.
Nematicidal potential of ten terrestrial heterocystous and non heterocystous cyanobacteria were compared against root-knot nematode, Meloidogyne incognita J2s. The extracts of all the ten unsonicated cyanobacteria caused an average immobility of 4.8–22.9% and mortality of 1.5–5.6% which increased to 88.2–96.5% and 4.2–29.3% on sonication, respectively. The highest per cent mean mortality was observed in S. nidulans (29.3) followed by P. tenue (26.8), M. tenera (25.8), T. nodosa (22.6), M. vaginatus (21.3), S. bohmeri (17.5), N. punctiforme (6.5), A. variabilis (5.6), C. brevissima (5.1) and least in H. luteolus (4.2); with an increase in exposure time from 24 to 72h. The immobility and mortality were significantly higher in sonicated extracts compared to unsonicated extracts.
cyanobacteria, extracts, heterocystous, non heterocystous, immobility, mortality. Meloidogyne incognita
