International Journal of Plant Protection

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Effect of Inoculum Density of Root Knot Nematode (Meloidogyne incognita) on Okra (Abelmoschus esculentus L.)


Affiliations
1 Department of Nematology, College of Agriculture, Orissa University of Agriculture and Technology, Bhubaneswar (Odisha), India
     

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A pot culture experiment was conducted to find out the effect of different inoculum levels of nematode on the plant growth and nematode multiplication on okra plant. Findings revealed that significant reduction occurred in plant growth parameters viz., shoot length, ischolar_main length, fresh shoot and ischolar_main weight, dry shoot and ischolar_main weight of plant inoculated with 1000 juveniles and above per pot. The highest gall index and egg masses were also recorded at inoculums levels of 1000 and 10000, respectively. Nematode population in soil increased progressively with an increase in nematode inoculum level from 10 to 10000 J2/kg of soil. Maximum population was recorded at inoculum level of 10000 J2/kg of soil followed by 1000 J2/kg of soil which were statistically at par. The reductions in growth parameters and nematode infestations were found to be directly proportional to the inoculums level. Considering the spectacular decline in plant growth parameters and steep rise in number of galls and eggmasses in infected ischolar_mains caused by Meloidogyne incognita at the inoculum level of 1000 J2/kg soil and above, so it is considered that 1000 J2 M. incognita/kg soil happened to be damaging the thresh hold in okra.

Keywords

Okra, Meloidogyne incognita, Inoculums, Pathogenicity.
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  • Effect of Inoculum Density of Root Knot Nematode (Meloidogyne incognita) on Okra (Abelmoschus esculentus L.)

Abstract Views: 270  |  PDF Views: 1

Authors

J. K. Mahalik
Department of Nematology, College of Agriculture, Orissa University of Agriculture and Technology, Bhubaneswar (Odisha), India
N. K. Sahoo
Department of Nematology, College of Agriculture, Orissa University of Agriculture and Technology, Bhubaneswar (Odisha), India

Abstract


A pot culture experiment was conducted to find out the effect of different inoculum levels of nematode on the plant growth and nematode multiplication on okra plant. Findings revealed that significant reduction occurred in plant growth parameters viz., shoot length, ischolar_main length, fresh shoot and ischolar_main weight, dry shoot and ischolar_main weight of plant inoculated with 1000 juveniles and above per pot. The highest gall index and egg masses were also recorded at inoculums levels of 1000 and 10000, respectively. Nematode population in soil increased progressively with an increase in nematode inoculum level from 10 to 10000 J2/kg of soil. Maximum population was recorded at inoculum level of 10000 J2/kg of soil followed by 1000 J2/kg of soil which were statistically at par. The reductions in growth parameters and nematode infestations were found to be directly proportional to the inoculums level. Considering the spectacular decline in plant growth parameters and steep rise in number of galls and eggmasses in infected ischolar_mains caused by Meloidogyne incognita at the inoculum level of 1000 J2/kg soil and above, so it is considered that 1000 J2 M. incognita/kg soil happened to be damaging the thresh hold in okra.

Keywords


Okra, Meloidogyne incognita, Inoculums, Pathogenicity.

References