Abstract: The growth of tobacco suckers in tobacco plants is inhibited by applying to the tobacco plants an effective amount of a substituted 2,6-dinitroaniline alone or in combination with a surfactant.

Abstract: A method of protecting plant life from injury due to frost or sub-freezing temperatures which comprises applying to the plant an effective, but non-phytotoxic amount, having regard to the plant being treated of a compound of the formula: ##STR1## wherein R.sub.1 is lower-alkyl;R.sub.2 is selected from the group consisting of:A. lower-alkyl, andB. 2-hydroxy alkyl of 3 to 18 carbon atoms; andA is selected from the group consisting of:A. alkyl of 3 to 13 carbon atoms,B. 2-hydroxy-lower alkyl,C. lower alkenyl,D. substituted phenyl, substituted by substituents selected from the group consisting of:I. p-nitro,Ii. halo, andIii. lower alkoxy, ##STR2## wherein R.sub.3 and R.sub.4 are each independently selected from the group consisting of:I. hydrogen,Ii. alkyl of 2 to 18 carbon atoms,Iii. substituted phenyl,Iv. benzyl,V. lower-alkoxy carbonyl, andVi. 2-hydroxy-lower alkyl; and ##STR3## wherein R.sub.5 is lower alkyl;R.sub.6 is selected from the group consisting of:I. alkyl of 3 to 8 carbon atoms,Ii.

Abstract: A method for producing a growth regulating effect in a plant which comprises applying to the plant an effective amount, with respect to the plant being treated, of cinchoninic acid or a derivative thereof.