Effect of amino acids and ascorbic acid onMeloidogyne javanica Chitw. (Tylenchidae,Nematoda)

The effect of aqueous solutions of L-arginine, L-glutamic acid and ascorbic acid onMeloidogyne javanica egg hatch, juvenile survival, and maturity and fecundity of nematode females in susceptible tomato roots was investigated. All tested compounds significantly suppressed egg hatchability at all concentrations (1000, 2000 and 4000 ppm). L-arginine proved to be the best one in inhibition egg hatch and achieved the highest inhibition percentages at all tested concentration. Inhibition rate of egg hatch increased by increasing the concentration of amino acids and vitamin. L-arginine and L-glutamic acid and ascorbic acid at 2000 ppm resulted in 100% mortality ofM. javanica juveniles after 7 days exposure. Application of aqueous solutions of L-arginine, L-glutamic acid, and ascorbic acid at 1000 ppm significantly reduced numbers ofM. javanica populations, mature females and eggmasses in tomato roots. The maximum inhibitory effect was obtained by L-arginine acid which surpassed both ascorbic acid and L-glutamic acid, in reducing nematode population (R% were 84.95, 80.11 and 70.4, respectively) and in affecting maturity and fecundity of females (maturity % were 53.7, 54.2 and 67.7 and fecundity % were 39.2, 46.2 and 61.2 for L-arginine acid, ascorbic acid, and L-glutamic acid respectively, in comparison with that of control group).