On Fri, 24 Aug 2007 03:58:17 -0700, Charles Packer
wrote:

My wife would like to know what ails
her snap beans. The tops of the leaves
look like some graffiti artist cleaned
out the nozzle of his white spray can
in the vicinity.
http://cpacker.org/a1.jpg
shows her row of seven pots.
http://cpacker.org/a2.jpg
is a close-up of a couple of the
worst-affected leaves.

I tried to do a Web search on this,
but wasn't able even to begin zeroing
in on anything relevant.

My first guess is spider mites. Look for tiny insects on the back of
the leaves.
--
Susan N.

"Moral indignation is in most cases two percent moral,
48 percent indignation, and 50 percent envy."
Vittorio De Sica, Italian movie director (1901-1974)