Response of Tomato Plants to Β‐naphthoxyacetic Acid

The Status of Plant-Growth Substances and Herbicides in 1945.

“…Water solutions kill more slowly than kerosene solutions. Formative effects were noticed to a greater or less extent in the earlier experiments on plant-growth substances, but with the synthesis of 0-naphthoxyacetic acid (5,6,7,86,168) and the phenoxy compounds (70,169) it was found that a slight increase in the concentration of these substances multiplied the formative effects to such an extent that a sprayed plant seemed to exhaust or destroy its food reserves and collapse in its entirety (61). The use of the more effective growth substances as herbicides naturally suggested itself (109).…”