Impact of certain plant oils on meloidogyne incognita infecting okra plant [electronic resource].

Includes reference.

Eight essential oils Le. almond, carnation, castor, chamomile, eucalyptus, garlic, lupine and sesame in comparison with oxamyl were used in contro/Jing the rootknot nematode, Meloidogyne incognita infecting okra. The trial was carried out in plastic pots under greenhouse conditions. Results illustrated that the tested plants oils remarkabley reduced root ga/Jing and eggmasses of M. incognita on okra as well as improved plant growth parameters to various degrees. Among plant oils tested, garlic treatment accomplished the highest values in improving plant growth parameters which averaged 47.8, 71.7 and 105.5% for plant length, total plant fresh weight and shoot dry weight, followed by sesame application with values of 39.7, 52.1 and 61.1% and then castor treatment with values of 39.7, 50.0 and 61.1% for the same plant criteria, whereas, the least values was recorded by chamomile oil that averaged 3.1, 16.3 and 5.5%. respectively, as compared to nematode alone. Moreover, sesame oil surpassed over tested plant oils in eliminating root galls (70.5%) and eggmasses (84.0%) of M. incognita on okra roots, followed by garlic oil (69.2 &84.0%), lupine oil (68.8 & 84.0%) and then castor oil (50.9 & 84.0%), whereas, eucalyptus oil· gave the least values for these two nematode criteria (12.5 & 43.0%), respectively. Oxamyl also improved plant growth parameters and gave 100.0% reduction in nematode criteria.

Summary in arabic.

1