The work was carried out at the Experimental Field Station of the National Institute of Cashew Research (CNPAT/EMBRAPA) in Pacajus County, State of Ceará, Brazil, in order to study the influence of chemical stimulants to extract gum from cashew tree (Anacardium occidentale, L.), as well as to study its interference on future gum productions. Sulphuric acid concentrations of 0, 15, 30 and 45%, combined with concentrations of 0, 5, 10, 15 and 20% of 2-chloroethylphosphonic acid and 5% dimetil sulphoxide were tested in a factorial design. The influence of the stimulant over the future gum exudation was also assessed. A general increase of gum exudation was obtained in all months following the stimulant applications; sulphuric acid did not increase gum exudation in any of the used concentrations. On the other hand, a 15% concentration of 2-chloroethylphosphonic acid allowed the highest rate of gum exudation.
cashew plants; chemical stimulants; gum exudation
