Effects of plant growth regulators and other compounds on flow of latex in Hevea brasiliensis

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Abstract
SUMMARY: Eighty‐nine compounds have been tested for their ability to promote the flow of latex from Hevea brasiliensis after tapping. The twenty‐four substances which showed significant activity were: twelve chloro‐ and fluoro‐phenoxy alkylcarboxylic acids substituted in the 4‐, 2, 4‐ and 2, 4, 5‐ positions, two chlorinated benzoic acids, α‐ and β‐naphthaleneacetic acid, 3‐indolylacetic acid, 2‐methoxy‐4‐diethylamino‐6‐isopropylamino‐1, 3, 5‐ triazine (methoxy‐ipazine), N,N‐diallyl‐α‐chloroacetamide (CDAA), 1,1′‐dimethyl‐4,4′‐bi‐pyridilium‐2A (paraquat), neomycin, dichloro‐m‐xyienol, and phenyl mercury acetate and chloride. Despite the many replications the high variability of the yield data does not allow of a precise classification of the relative activities. The most active compounds were 2, 4‐dichloro‐5‐fluorophenoxyacetic acid and 2, 4, 5‐trichlorophenoxyacetic acid (2, 4, 5‐T), although 2, 4‐dichlorophen‐oxyacetic acid (2, 4‐D) gave increases in yield comparable to those of 2, 4, 5‐T in some of the trials.