Foliar Spray Effects of Selected Amino Acids on Sunflower Infected with Meloidogyne incognita.

Overman and Woltz (3) indicated that amino acid antimetabolites applied to tile soil suppressed reproduct ion of Paratrichodorus minor (Trichodorus christiei) and root galling caused by Meloidogyne incognita on tomatoes. Eight DL-amino acid antimetabolites similarly decreased the population of Aphelenchoides ritzemabosi on Lucerne, whereas DL-alanine suppressed the populat ion of Heterodera spp. without harming the host plants (5). Evans and Trudgi l l (1) found that DL-methionine was toxic to H. rostochiensis (Globodera rostochiensis) infecting potato plants. Methionine did not act as a contact nematicide; it was presumably ingested in sap extracted from giant cells after being taken up by the host plant. Krishna Prasad and Setty (2) showed that two amino acids used