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    MiscellaneousItemOpen Access
    Interaction of Fusarium solani and Meloidogyne javanica in Causing Root Rot of Fennel and its Management
    (2022) KUMAWAT, KIRAN
    Abstract Fennel is one of the important seed spice crops grown in India Fusarium solani and Meloidogyne javanica are widely distributed pathogens in India which cause root rot and root knot complex in fennel and responsible for severe economic losses. Considering the economic importance of these, the present investigation was carried out to know the interaction of Fusarium solani and Meloidogyne javanica in causing root rot of fennel and its management. Fennel plants depicting root rot symptoms were collected from farmer’s field. The fungus, Fusarium solni was isolated from infected fennel plants, purified by single spore technique and proved pathogenic. An experiment was conducted on interactive effect of Fusarium solani and Meloidogyne javanica on root rot incidence in fennel. Minimum nematode reproduction and maximum plant growth parameters were recorded by inoculating fungus at the time of sowing and nematode after one week. While, maximum disease incidence was recorded by inoculating nematode at the time of sowing and fungus one week after. Among screened 30 varieties/germplasm of fennel, four varieties (RF-101, RF-145, RF-157 and RF-143) showed resistant reaction, 21 showed moderately resistant reaction and five showed susceptible reaction against the pathogens. Among all varieties/germplasm, highest root rot incidence was recorded in RF-125 and UF-33. However, minimum root rot incidence was recorded in RF-101 and RF- 205. * A Post Graduate Student, Department of Plant Pathology, S.K.N. College of Agriculture, Jobner (Jaipur- Rajasthan) - 303329. ** M.Sc. (Ag.) Thesis submitted to Sri Karan Narendra Agriculture University, Jobner for partial fulfillment of the requirement of degree under the supervision of Dr. S.K. Goyal, Asstt. Professor, S.K.N. College of Agriculture, Jobner (Jaipur- Rajasthan) - 303329 An experiment was conducted on management of the root rot and root knot disease complex through bio-agents (@ 2.5kg/ha as soil application) and botanicals (@ 10% concentration as seed soaking). Among all the treatments, combination of Trichoderma harzianum and garlic showed best results followed by Trichoderma harzianum + parthenium for increase plant growth parameters and reduce percent root rot incidence as well as nematode reproduction as compared to untreated control. Biochemical studies were also carried out to find the peroxidase, polyphenol oxidase, phenylalanine ammonia lyase and phenol level. Highest peroxidase, polyphenol oxidase, phenylalanine ammonia lyase and phenol activities was observed in Trichoderma harzianum and garlic followed Trichoderma harzianum + parthenium and parthenium treated fennel roots as compared to untreated control.