STIMULATION OF LATEX FLOW IN HEVEA BRASILIENSIS BY 4-AMINO - 3,5,6-TRICHLOROPICOLINIC ACID AND 2-CHLOROETHANEPHOSPHONIC ACID.

Experiments are reported in which numerous substances have been tested as stimulaters of latex flow. Application of 4-amino - 3,5,6-trichloropicolinic acid, alone or in mixtures with 2,4,5-T, gave larger and more persistent yield responses than application of 2,4,5-T alone in one experiment, but this was not confirmed in another. One morphactin was moderately effective but another was ineffective. N-dimethylamino-succinamic acid did not stimulate longer flow or give larger yields. Acetylene, ethylene, halogenoparaffins and 2-chloroethanephosphonic acid were all effective in prolonging flow and increasing yields. All effective non-gaseous stimulants of latex flow seemed to have one common feature, namely, production of ethylene.