Screening, isolation and evaluation of secondary metabolite producing streptomyces against spider mite, tetranychus urticae on okra

A survey was conducted in Tamil Nadu and Maharashtra to isolate the actinomycetes from the soil samples for study. Twenty seven cultures of actinomycetes were isolated, purified and designated as actinomycetes (A1 to A27). The test cultures A1 to A27 were taken for studying their acaridical activity. Preliminary screening revealed that five of the isolates were active against spider mite, Tetranychus urticae on okra. Out of the sixteen isolates A7 and A27 isolate showed highest activity against red spider mite, Tetranychus urticae.