Bioefficacy of different Populations of Steinernema carpocapsae against Root Knot Nematode Meloidogyne incognita (original) (raw)
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Biological Forum – An International Journal, 2022
The effect of different initial population density of root-knot nematode and damage they cause to the plants (in terms of root-galling) in dragon fruit, and nematode multiplication rate in soil was studied. The initial population density of nematodes (200, 500, 1000 and 2000 J2s/ 200 cm 3 soil) caused significant number of galls on the dragon fruit root system after 90 days of inoculation. Significantly higher numbers of galls (85.00/plant) were observed in the initial population density of 2000 J2s/200 cm 3 soil compared to 52.50 galls/plant in initial population density of 200 J2s/200 cm 3 soil. Higher multiplication rate (8.77-fold increase) was observed at the initial population density of 500 J2s/200 cm 3 soil. The present study clearly indicated association of M. incognita with dragon fruit is pathogenic as significant number of galls/egg masses and high nematode population density in soil was observed at initial population density of 500 J2s/200 cm 3 soil.
Root-knot nematode (Meloidogyne incognita) and its management: a review
Journal of Agriculture and Natural Resources
Root-knot nematode (RKN) Meloidogyne incognita stands out among the most harmful polyphagous endoparasite causing serious harm to plants, and distributed all over the globe. RKN causes reduced growth, quality and yield along with reduced resistance of the host against biotic and abiotic stresses. Infective second stage juvenile enters host roots with the help of the stylet and becomes sedentary getting into the vascular cylinder. Dramatic changes occur in host cells, making a specialized feeding site, induced by the secretion of effector protein by RKN. M. incognita can be controlled by nematicides, biocontrol agents, botanicals essential oils and growing resistant cultivars. Nematicides are no longer allowed to use in many parts of the world because of environmental hazards and toxicity to humans and other organisms. Researchers are concentrating on searching suitable alternatives to nematicides for effective management of M. incognita. This review mainly tries to explain the biolo...
Keeping in view the staid health and ecological apprehensions coupled with the use of pesticides, entomopathogenic nematodes have the potential to supersede pesticides for the management of various pests. Brinjal is seriously affected by Meloidogyne incognita. Research was conducted on two important groups of nematodes, plant parasitic nematodes (RKNs) and insect parasitic nematodes (entomopathogenic nematodes). Steinernema asiaticum, S. glaseri, Heterohabditis indica and H. bacteriophora were evaluated at different time of application against M. incognita for invasion, development and reproduction of M. incognita. In a life cycle study, S. asiaticum and H. bacteriophora were proved more effective in influencing the life cycle of RKNs at all application times than S. glaseri and H. indica. However all application time of entomopathogenic nematodes (before, with and after) the application of M. incognita proved effective as compared to control treatment. S. asiaticum and H. bacteriophora delayed penetration of nematode juveniles (J2) into roots of brinjal. © 2015 Friends Science Publishers
Studies on Pathogenicity of Root-Knot Nematode, Meloidogyne Incognita on Sweet Potato
2020
Sweet potato, Ipomoea batatas (L.) Lam., is a dicotyledous plant that belongs to the family Convolvulaceae. Different quantities of the nematode suspension having a concentration of 100 infective larvae per ml was carefully inoculated to plants (var. Kanhangad local) by pouring into the holes depending upon the number of infective larvae required to be inoculated i.e., 0.1ml, 1ml, 10 ml, 50 ml and 100 ml in order to inoculate 10, 100, 1000, 5000 and 10000 infective larvae, respectively. Three months after inoculation, pots were carefully depotted and the results revealed that, highest reduction of number of leaves per plant, vine length, plant height, root length, fresh weight and dry weight of shoot was observed in plants inoculated with 10000 J2 per pot (59.00, 117.33 cm, 126.00 cm, 13.00 cm, 46.00 g & 10.67 g) and minimum reduction was recorded in plants inoculated with 10 J2 per pot (88.00, 139.33 cm, 149.00 cm, 21.11 cm, 100.67 g & 22.33 g), followed by plants inoculated with 1...