Efficiency of certain nematicides against Root-Knot Nematodes Meloidogyne incognita on Tomato Plants Under Laboratory and Greenhouse Conditions.

The effect of five nematicides {Tervigo 2% SC(abamectin), Dento 40% EC (fenamiphos), Nemathorin 20% EW (fosthiazate), Vydate 24% SL (oxamyl) and Velum Prime 40% SC (fluopyram)}, for the control of M. incognita infected tomato plants (cv. Carioca) was evaluated under the laboratory and greenhouse conditions. All the tested compounds was found to be caused nematicidal activity. In laboratory studies, the LC50 of the tested compounds were 05.39, 12.73, 8.61, 09.53 and 03.47 mg l-1 (ppm), respectively. Also, fluopyram and abamectin were the most effective in the inhibition of egg hatching which gave EC50 values were 02.23 and 01.96 mg l-1, respectively. Moreover, among all the tested nematicides, abamectin was the only nematicide which had irreversible inhibition to J2 motility, while the nematode which exposed to other nematicides recovered their motility after 1 and 24hrs from exposure. The egg differentiation showed that, fluopyram and abamectin were the most effective in the reduction % of egg differentiation in laboratory studies. Under greenhouse conditions, all the tested nematicides were reduced galls formation and other nematode criteria and increased tomato plant growth compared to untreated control. The obtained results show that abamectin was the least nematicide in controlling of nematode infection as soil drenching treatment in greenhouse pots experiment, while it has been strong nematicidal activity on J2 and egg hatching of nematodes in laboratory studies.