alternative to chemicals and sprays, ladybugs, when released at sundown (since they don't fly at night) will eat aphids, mealybugs, scale, leaf hoppers, thrips, plant-eating worms, and other destructive soft-bodied pests. The ladybugs will then lay eggs and when new pests arrive, fresh ladybugs will be waiting for them with open JAWS. 500 live lady bugs for 8 bucks
While you do risk reducing the populations of beneficial insects by releasing praying mantis into your garden/greenhouse, you increase the chances that insect pests troubling your plants will be eliminated. Ive hatched them out before and the frogs got most of them before they had a chance to harden up and fly off. I have to be more careful where I set the nest out.
You can buy the nest and set it up and watch for em.
that is all I use as I no longer use chemicals for pest..It might work for some of you too who have animals or allergies to deal with.. Good luck