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The potency of the some chemicals from different groups known as inducers of systemic acquired resistance (SAR) viz., acetylsalicylic acid (ASA), DL-3aminobutyric acid (BABA), 2,6-dichloroisonicotinic acid (INA), 5-chlorosalicylic acid (CSA), nitrosalicylic acid (NSA),salicylic acid (SA),ascorbic acid (AS), and selenium (SE) in reducing reproduction Meloidogyne incognita in tomato plants cv. Castel rock was investigated under greenhouse conditions. Supplying chemicals three days-before nematode inoculation showed maximum efficacy in reducing nematode galls, egg-masses and eggs numbers followed by synchronized addition with inoculation, while post-inoculation treatment was less effective. Reiterative doses post-inoculation were improved the efficacy of single dose, also three doses used were more effective than one or two, while, differences between two or three doses were insignificant. On the other hand, plant fitness was slightly impaired with third dose than second one. INA and SE showed pronounced effect in inhibition nematode population after third dose compared with the rest chemicals, which showed mild increase in their efficacy from second to third doses. Unfortunately, three doses of SE were reduced plant fitness after enhanced by double doses, while INA was showed obvious phytotoxicity gradually increased by repeating doses. Gathering between the most effective application time (before inoculation) and the proper activated dose after inoculation was studies for emphasized their action and comparing with pre-inoculation only in suppressing M. incognita population. Chemical activators showed enhancing in peroxidase and polyphenoloxidase activities. In conclusion, CSA, NSA, BABA and SA were showed highest efficacy as resistance inducers. This collectively showed reduction of total population with pre-inoculation time application and pre plus post-inoculation application, 57.6&83.8%, 56.5&81.6%, 55.4&79.2% and 54.5&78.1%, respectively. Also the fecundity of nematode was taking similar trend as total population. The results suggest that tested chemicals especially CSA, NSA, BABA and SA have potential to suppress root-knot nematode infection in tomato plants through induced systemic resistance.

Evaluation of some Chemical Substances as Inducers forTomato Resistance Against Root-Knot Nematode, Meloidogyne incognita