Relative Effectiveness of the Mono-, Di-, and Trichlorophenoxyacetic Acids in Preventing Abscission of Lemon Leaves

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Abstract
1. All the ring-substituted mono-, di-, and trichlorophenoxyacetic acids were tested for their activity in preventing ethylene-induced abscission of leaves from lemon cuttings. 2. The most active of the monochloro compounds was 4-chlorophenoxyacetic acid. 3. Maximum activity was associated with compounds having chlorine in the 2 and 4 positions and hydrogen in the 6 position. An additional chlorine atom in either the 3 or the 5 position had no measurable effect on the activity of 2,4-D. 4. Possible applications in controlling abscission are discussed.