Control of Root-knot Nematodes on Tomato by Lectins

  • N. Marban-Mendoza
  • A. Jeyaprakash
  • H.-B. Jansson
  • R. A. Damon, Jr.
  • B. M. Zuckerman


Significant control of tomato root knot was achieved by applications of the lectins Concanavalin A (Con A) and Limaxflavus agglutinin in greenhouse, growth chamber, and microplot trials. Four consecutive weekly applications at lower concentrations of Con A yielded better control than single applications at a higher total concentration. The present state of knowledge on binding of Con A to soil nematodes and the in vitro effect of this lectin in chemotactic behavior are discussed. The mode of action of Con A on root-knot control is unknown. Key words: Concanavalin A, Limax flavus agglutinin, Lycopersicon esculentum, Meloidogyne incognita, root knot, tomato.