Suppressive effects of certain vitamins and organic acids against Meloidogyne incognita on Okra plant and their role in improving host growth under greenhouse conditions
2009
Refaei, A.R.
A pot experiment was conducted to determine the effects of six vitamins i.e. ascorbic acid, citric acid, folic acid, nicotinic acid, pyridoxine and thiamine in comparison with oxamyl against Meloidogyne incognita infecting okra plant under greenhouse conditions. Obviously, all tested materials ameliorated plant growth and reduced number of root galls and eggmasses of M. incognita to distinguished degrees. Among the tested compounds, ascorbic acid treatment ranked first in ameliorating okra plant length (75.9%), total plant fresh weight (75.0%) and shoot dry weight (111.1%), followed by nicotinic acid and thiamine, whereas citric acid and pyridoxine showed the least values of the same plant growth parameters comparing to nematode alone. Moreover, ascorbic acid application accomplished the greatest reduction percentage values of 82.7 and 96.6% for number of root galls and eggmasses, followed by folic acid in reducing root galls (81.2%) and eggmasses number (96.6%), respectively. Whereas, nicotinic acid and thiamine showed considerable records for the same nematode parameters with values of 75.7 and 90.5% each. However, oxamyl as a nematicide ranked first in suppressing root galling (96.9%) and eggmasses number (99.1%), but ranked the third in improving okra plant fresh weight.
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