Urgeant help tomato leaves gone balck over night

[mistresslizz]

can someone can help me..


leaves on one of my varieties of tomatoes have gone black over night - well in last 2 days.

2 days ago i sprayed these plants with pyrethium spray.. and yeasterday it rained all day..

today i have black over a number of leaves.. can any one help

there are no markings un the underside of the leaves just the tops..

and its spread over both the top and bottom of the plants..

could i have burned them with the bug spray???

[Shetty]

I am not sure, but could it be sun scorching the plant after the rain or the spraying?