Use of derivatives of N-phenl-3,4,5,6-tetrahydrophthalimide for the desiccation and abscission of plant organs

Abstract

Derivatives of N-phenyl-3,4,5,6-tetrahydrophthalimide of formulae I and/or II where A, R, E n , Y, and R 16 have the meanings stated in the description, which compounds are used for the dessication and abscission of plant organs.

We claim:  
     
       1. A method for the dessication and abscission of plant organs, wherein an effective plant organ desiccating and abscising amount of a derivative of N-phenyl-3,4,5,6-tetrahydrophthalimide of the formula I                    
       where 
       R is hydrogen, fluorine or chlorine,  
       A is group I-1, I-2 or I-3                   
       wherein 
       R 1  is hydrogen, chlorine, bromine, cyano or C 1 -C 6 alkyl,  
       R 2  is hydrogen, C 1 -C 8 -alkyl, C 1 -C 8 -alkenyl  C 2 -C 8 -alkenyl, C 2 -C 4 -alkynyl, C 1 -C 4 -alkoxy-C 1 -C 4 -alkyl, C 1 -C 4 -alkylthio-C 1 -C 4 -alkyl, or phenyl-C 1 -C 3 -alkyl or phenyl which is unsubstituted or substituted by halogen ,  
       R 4  and R 5  are each hydrogen or C 1 -C 3 -alkyl,  
       Q is oxygen or sulfur,  
       R 7  is hydrogen, C 1 -C 6 -alkyl, C 1 -C 6 -alkoxyalkyl, C 1 -C 6 -alkylthioalkyl or C 5  or C 6 -cycloalkyl, and  
       R 13  is hydrogen or C 1 -C 4 -alkoxycarbonyl,  
       is applied to plants or their habitat. 
     
     
       2. A method as claimed in  claim 1 , wherein an N-phenyl-3,4,5,6-tetrahydrophthalimide of the formula I, where R is hydrogen and A is a group I-1                   
       is applied. 
     
     
       3. A method as claimed in  claim 1 , wherein an N-phenyl-3,4,5,6-tetrahydrophthalimide of the formula I where R is hydrogen, A is a group I-1, Q is oxygen, R 1  is chlorine or bromine and R 2  is methyl or ethyl, is applied. 
     
     
       4. A method as claimed in  claim 1 , wherein from 0.001 to 5 kg/ha of the N-phenyl-3,4,5,6-tetrahydrophthalimide of the formula I as set forth in  claim 1  is applied to plants or their habitat. 
     
     
       5. The method of  claim 3  wherein R 1    is chlorine and R   2    is C   2   H   5 .