Effects of Some Medicinal Plant Extracts for Controlling Root-knot Nematode Meloidogyne incognita (Kofoid and White, 1919) Chitwood, 1949
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Abstract
Efficacy of medicinal plant inhibited nematode egg hatching, aqueous extracts including marigold, neem and garlic was tested and against root-knot nematode (Meloidogyne incognita (Kofoid and White, 1919) Chitwood, 1949). In vitro three plant aqueous extracts at 1:1 concentration showed the highest inhibition. Garlic extract produced least development of eggs at 1:2 .The concentration is second to inhibited eggs hatchability, garlic extract at 1:4 concentration and 1:2 concentration of marigold and neem extract showed a similar results on eggs hatchability that did not differ significantly, while the lowest inhibition on eggs hatchability was marigold extract at 1:4 concentration. Stereo microscope observations found that nematode eggs in neem and marigold extract developed to J1 nematode after 72 hours, while nematode eggs in garlic extract found cell division, however J1 nematode were not found in egg. The greenhouse experiment all extracts reduced root galling. The garlic extract showed the best result to inhibited the gall followed by neem and marigold extract respectively.
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