Ten filtrates of actinomycetes cultivated in liquid medium, induced reduction of motility and 100% mortality of Meloidogyne javanica J2. Some of them, when diluted in water, reduced mortality to 75 a 85%. However, the isolate PIC 1, maintened J2 mortality of 100%, even after dilution in water. Some filtrates reduced motility, without causing mortality. Among the isolates that caused mortality, some also reduced J2 hatching. Nevertheless, the level of hatching inhibition varied with the growing status of the actinomycete in liquid medium. Exudates obtained from some actinomycete cultures in solid medium induced 100% mortality and reduction on motility of J2 of M. javanica. The isolates of actinomycetes ALF 4 and QUI 4 produced substances toxic to J2 in filtrates and in colony exudates as well.
root-knot nematode; reproduction; toxic effect; broth medium; exudation
