Biocontrol Efficacy of Different Species of Fusarium Isolated from Various Agro-Climatic Regions against Root-Knot Nematode, Meloidogyne incognita on Tomato
2005
Singh, Satyendra | Goswami, BK | Gaur, HS
The egg masses of root-knot nematodes infected roots of vegetables and pulses were collected and isolated on potato dextrose agar (PDA) medium. After purification and identification, the species of Fusarium viz. F. chlamydosporium, F. dimerum, F. moniliformae, F. oxysporum, F. oxysporum f.sp. lycopersici, F. pallidoroseum, and F. solani were undertaken for study. The culture filtrate of each species was used for in-vitro and fungal mats grown on same broth for in-vivo studies. Both larvicidal and ovicidal tests proved F. dimarum (63%) and F. oxysporum (58%) to be toxic against M. incognita larvae while others, particularly pathogenic ones, did not show any toxicity. F. oxysporum, in addition, also expressed high egg parasitisation capacity (67%). In the pathogenicity test, F. oxysporum f. sp. lycopersici, F. pallidoroseum and F. solani proved to be highly pathogenic on tomato. The above three species also produced disease-complex (synergistic) symptoms when M. incognita larvae @ 2 J2 per gram soil were inoculated along with these fungi separately on the host. Based on the findings, it can be concluded that the toxic and egg parasitic nature of both the species of Fusarium (oxysporum and dimarum) might have increased the host vigour (42.6 and 38.8 cm) and decreased the root knot nematode development (galls 8 and 12) and reproduction (population 1278 and 2336).
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