Interaction of Fusarium solani and Meloidogyne javanica in Causing Root Rot of Fennel and its Management
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Date
2022
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Abstract
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.