Effect of inoculum density of root knot nematode (Meloidogyne incognita) on okra (Abelmoschus esculentus L.)

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, root length, fresh shoot and root weight, dry shoot and root 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 J 2 / kg of soil. Maximum population was recorded at inoculum level of 10000 J 2 / kg of soil followed by 1000 J 2 / 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 roots caused by Meloidogyne incognita at the inoculum level of 1000 J 2 /kg soil and above, so it is considered that 1000 J 2 M. incognita /kg soil happened to be damaging the thresh hold in okra. How to view point the article : Mahalik, J.K. and Sahoo, N.K. (2016). Effect of inoculum density of root knot nematode (Meloidogyne incognita) on okra (Abelmoschus esculentus L.).

Studies on Pathogenicity of Root-Knot Nematode, Meloidogyne incognita on Turmeric

“…The highest fresh and dry weight of rhizome was recorded in plants inoculated with 10 J 2 per pot (269.00 and 53.10 g) as against least in plants inoculated with 10000 J 2 per pot (181.00 and 35.67 g). Maximum reduction was seen in plants inoculated with 10,000 J 2 per pot and this was in accordance with the findings of Mahalik and Sahoo (2016) and Kantharaju (1999). Plants inoculated with 1000 or more nematodes the plant growth was significantly reduced in cucumber (Krishnaveni and Subramanian, 2003).…”

“…The highest gall index and egg masses were also recorded at inoculums levels of 1000 and 10000 respectively (Krishnaveni and Subramanian, 2003;Mahalik and Sahoo, 2016).…”

Effect of different levels of inocula of Meloidogyne incognita on plant growth of Pea (Pisum sativum L.) and reproduction of nematodes

“…The results are in conformity with the results obtained by Das [26] on pea, Chandra et al [27] on brinjal (Cv. Pusakranti), Khan et al [13] on broccoli, Ganaieet et al [14] on okra, Ahmed et al [28] on chilli and Mahalik and Sahoo [29] on soybean (Cv Js 2034).…”

Silicon promotes the control of Meloidogyne incognita in lettuce by increasing ascorbic acid and phenolic compounds

“…Nematode infection in lettuce plants correlates with the greater availability of food for nematodes (Mahalik and Sahoo 2016), causing biological damage to plants (Amaral et al 2013). Inoculation of 6000 or 12000 eggs and J2 of M. incognita caused plant stress as it increased the rate of electrolyte leakage due to the decrease in the content of antioxidant compounds (phenolic compounds and ascorbic acid) in the plants of the two experiments (Fig.…”