[R] deleting rows containing a letter

[chris20]

Hi
I have dataframe with different plot numbers in and different subplots as
letters at the end of the plot number i.e. 1a, 1b 2-1a etc.
I want to delete all rows that end in a specific letter eg...

treat<-c("1a","1b","1c","2a","2b","2c","2-1a","2-1b","2-1c")
a1<-1:9
b1<-9:1
d1<-data.frame(treat,a1,b1)

How do I remove all rows where treat ends in "c" ?  I have tried the usual
ways of deleting rows but nothing works.

Thanks
Chris 

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