a great and easy way, for me, is diatomaceous earth. it's crushed shells and cuts bugs to ribbons, as well as dehydrates and kills them. It's fantastic stuff and won't hurt your plants, or worms if you use them, at all.
If you don't have any of that, you can get some Amazing Doctor Zymes. this stuff takes care of any pest or fungus/mildew. you can get a couple free samples from this link, but you have to pay for shipping. it's worth it, since each sample makes a gallon of secret sauce.
www.doctorzymes.com/wizard
I hope this helps.