[digsdirt]

What I tend to call environmental damage - wind and weather primarily. Like Ray said look for pests - aphids and other leaf suckers as well. See how the damage parallels the leaf veins? That usually means pests on the underside of the leaves.

I see some weeds in the pics as well and that often means insects are hanging around.

Also strip those leaves from the plants to make it easier to monitor future damage.

Dave