Need larger image of dark spots but my thought is *Not* whitefly. They colonize underside of leaf.

The white spots could be cast skins of aphids.
The fuzzy black spots could be aphids infected with fungus. Again, need improved image to know for certain.

Kelthane hasn't been available retail for a number of years.

I agree with Jean and would suggest that potassium-based insecticidal soap is a better choice for spraying, if necessary.

Could be newly hatched squash bugs too. The pic is too small.

Sure look like whiteflies to me. Maybe there are more on the undersides of the leaves.

At any rate, insecticidal soap is the thing to try.

I am able to open the picture and zoom in to enlarge the size. If you can't you can open the picture,right click to save it and then reopen and zoom in for a closer look. I have some wettable kelthane which has been stored airtight and should still be servicable. As for the insecticidal soap mentioned can someone provide a specific name? This could be anything from a mixture of dishwashing liquid or wood oil soap and water to a commercial brand.

Thanks again.