Effect of culture filtrates of different fungi on mobility of second stage juveniles of Meloidogyne incognita

In-vitro effect of five different fungal culture filtrates (Rhizoctonia bataticola, Alternaria alternata, Aspergillus flavus, Penicillium chrysogenum and Trichoderma viride) at four concentrations viz. 25, 50, 75, and 100 per cent alongwith the check (in water) were evaluated and observations were recorded on mobility of larvae at 6, 12, 24, and 48 hours. The observation on the effect of culture filtrate of five fungi on mobility of second stage juveniles of M. incognita revealed that with the increase in exposure period, corresponding immobility of second stage juveniles also increased in all the fungal culture filtrates. At 6 and 12 hour exposure period irrespective of concentration level, the mobility of larvae was not affected by all the fungal culture filtrate except P. chrysogenum in which the mobility decreased significantly. During 24 hours exposure period, R. bataticola in all the concentration gave cent per cent immobility of second stage juveniles of M. incognita, whereas culture filtrate of P. chrysogenum caused cent per cent immobility in highest concentration. In other fungal filtrates in 100 per cent concentration at 24 hours exposure period, the immobility was observed 99.67 per cent in T. viride, 95.33 per cent in A. alternata and 31.33 per cent in A. flavus. At 48 hours exposure period in addition to R. bataticola, T. viride also gave cent per cent immobility in all the concentrations, whereas in culture filtrate of A. alternata and P. chrysogenum, 100 per cent immobility was observed in highest concentration.