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Various resistance-inducing chemicals were assessed in the interaction between mango ( Mangifera indica L.) and the anthracnose pathogen Colletotrichum gloeosporioides . These were salicylic acid, isonicotinic acid, benzo (1,2,3) thiadiazole-7-carbothionic acid S-methyl ester (Actigard®)7, and other chemical compounds structurally similar, such as nicotinic acid, nicotinic acid adenine dinucleotide, isonicotinic acid ethyl ester, N-oxide isonicotinic acid, benzoic acid and sodium benzoate. No significant differences (P > 0.05) in C. gloeosporioides colony growth were detected on culture media amended with the different resistance-inducing chemicals evaluated. At laboratory conditions, these compounds were sprayed to runoff on mango leaves and fruit pieces prior to inoculation. Lesion size was significantly reduced (P > 0.10) by concentrations ranging from 10 -12 M to 10 -6 M of salicylic acid (SA), 10 -18 M and 10 -14 M of isonicotinic acid (INA), 10 -17 M to 10 -2 M of Actigard®, and 10 -10 M benzoic acid (BA). Salicylic acid, INA and BA caused toxicity on leaves at concentrations ranging from 10 -1 to 10 -3  M. Chemical compounds that induced resistance at laboratory conditions were further evaluated on six-month-old mango seedlings in a shade house. None of the chemicals tested significantly (P > 0.05) reduced lesion size caused by C. gloeosporioides . Other resistance-inducing chemicals not tested during these studies, such as probenazole, cyclopropane carboxylic acid derivatives, non-protein amino acids [β-aminobutyric acid (BABA) and  ϒ - aminobutyric acid (GABA)] and Phytoguard®, should be evaluated individually and in combinations to clarify this lack of induced resistance in mango tissues.

Compuestos químicos inductores de resistencia contra Colletotrichum gloeosporioides en mangó