Biocontrol potential of Pasteuria penetrans, Pochonia chlamydosporia, Paecilomyces lilacinus and Trichoderma harzianum against Meloidogyne incognita in okra

摘要: The root-knot nematode, Meloidogyne incognita , is a sedentary endoparasitic plant pathogen with very wide host range, which causes annual crop losses amounting to millions of dollars. small number available nematicides and restrictions on the use non-fumigant due high toxicity humans non-target organisms hinder effective nematode control. A possible alternative chemical biological control agents for management this nematode. In present study, efficacy four biocontrol was tested against M. at different doses. Pasteuria penetrans Pochonia chlamydosporia Paecilomyces lilacinus Trichoderma harzianum were mass produced mixed formalin sterilized soil rates 2 × 103, 4 6 8 1 104 endospores/chlamydospores/cfu per g soil. Okra seeds (cv. Sabz Pari) sown in pots amended agents, 10 d after emergence, plants inoculated 2000 freshly hatched second stage juveniles incognita. Data growth parameters infestations recorded 7 weeks inoculation. antagonists varied significantly enhancing various reducing dose-responsive manner. Both P. equally caused maximum reductions galls, egg masses, fecundity build up as compared T. . Reductions these concentration 103 statistically similar those chlamydospores/ endospores/cfu. Our results indicate that application can suppress galling reproduction resulting enhancement growth.