to 50 growth control agent or 1 35 to 13 5 ml per plant somewhat greater amounts up to 2 u00d7 are of course involved with foliar application 2 butyl 2 ethyl 1 3 propanediol can be diluted with many essentially inert liquids and some advantage may be seen in admixtures with the alcohol corresponding to the diol where desired any wetting agent emulsifier or surfactant may be used although unlike certain other sucker control agents potentiation with surfactants is not required suitable surfactants may be selected from the anionic cationic and nonionic types including primary secondary and tertiary alkyl amines ethoxylated alcohol sulfates alkyl sulfates water soluble salts of a sulfonated alkyl alkylbenzene or alkyl glycerol ether quaternary ammonium salts quaternary imidazolinium salts alkyl pyridinium salts dialkyl morpholinium salts ethoxylated fatty acids and or sorbitol esters etc preferred are the sorbitan fatty acid esters and the ethoxylated derivatives ethers of polyoxyethylene glycol and fatty acid esters of polyethylene glycol the amount of surfactant can range from the ordinary low level of 0 1 to 2 0 up to that commonly used with sucker control agents i e 25 to 50 by weight of the active agent it is of course also possible to combine the application of sucker control agent with other plant agents including fertilizers herbicides fungicides insecticides rodenticides.