Tobacco (from both n. tabacum & n. rustica) makes a natural bug spray that's effective on a wide range of critters.
You just cook a bunch down, preferably letting it steep overnight, filter, add a couple drops of mild soap to help "wetting action" and spray down the affected plants.
Nicotiana rustica leaves have a nicotine content as high as 9%, whereas Nicotiana tabacum (common tobacco) leaves contain about 1 to 3%.
The n. tabacum produces much more leaf material but the n. rustica is generally considered easier to grow.
Dried leaves keep very well.
More reading:
Tobacco water - Wikipedia, the free encyclopedia
Nicotiana rustica - Wikipedia, the free encyclopedia
BUGS, eeeek!
Cooking & steeping a batch of dry & green leaves from n. tabacum & n. rustica.

Strain & Filter

Add a couple - few drops of mild soap to enhance wetting action.
Add brew to a spray bottle & douse the plants.
No more bugs! (alive, at least)
Check for tobacco seed at the
SEED TRADERS THREAD!