[Fraxinus]

Read the label before you spray anything...
Synthetic pyrethroids should work on most of the insects around the home. There is a reason why long residual and fumigants are professional only.

DDT has a very long residual, over six months at effective concentrations in humid tropics, a very bioactive environment. There are a great variety of effective compounds out there, however there are compounds that should be avoided for certain uses due to side effects.
Imidicloprid will cause mite resurgence.
Horticultural oil will burn plants in the presence of sulfur.
Acephate is a neurotoxin.
2,4,D will not kill grasses.

[east1234]

2,4-D is great stuff, whats the problem? Kills the weeds, leaves the grass, in use since the 1940's, no known problems.

[frannie]

If you are my age ,83, perhaps you can remember after World War11 the pictures of American troops spraying many with DDT to control whatever bugs were on them. I believe it was lice. Did these people have medical problems? Are any of them alive? Many were children, so some surely alive today.

This was not on the ground it was directly on the people.
The American troops did have protective covering. It seems to me that this is some data that is out there some place. How many of these people are still living and what has their health been over these many years.