Comparative suppressive effect of some organic acids against Meloidogyne incognita infecting tomato
Comparative suppressive effect of some organic acids against Meloidogyne incognita infecting tomato
M. A. Radwan†, M. M. Abu-Elamayem, S. A. A. Farrag and N. S. Ahmed
ABSTRACT
The comparative suppressive potential of some organic acids known as resistance inducing chemicals viz., salicylic
acid (SA) and its two derivatives; acetylsalicylic acid (ASA) and 3,5-dinitrosalicylic acid (DNSA), along with Lascorbic
acid (AA), oxalic acid (OA) and citric acid (CA) for managing Meloidogyne incognita infecting tomato
plants was investigated under greenhouse conditions. The results showed that all tested organic acids as well as the
application methods significantly reduced tomato root galls and 2nd stage juvenile numbers in soil compared with
control. Except DNSA and AA, foliar application of tested organic acids was more effective in reducing nematode
galls than soil drench application. Foliar application of ASA caused superior effect in the reduction of J2 in soil (100
%) followed by AA (89.44 %), OA (88.25 %) and SA (70.69 %). CA (96.52 %) was tended to be the most effective
chemicals in reducing J2 in soil when applied as soil drench. All treatments enhanced shoot and root length of tomato
as well as shoot weight compared with the untreated check. Only SA and DNSA significantly increased the root
weights. DNSA enhanced the growth indices of tomato plant when used as foliar spray more than soil drenching and
opposite trend was observed for OA. These chemical activators have potential to suppress M. incognita infection
through the stimulation of tomato tolerance.
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December 2017
Pakistan Journal of Nematology, Vol. 35, Iss. 2, Pages 113-216
