You must also create a safe environment for the predatory insects and keep them alive and strong. Once the predators are released into the garden, it will take a minimum of two weeks before you notice a difference in the spider-mite population. Predators must establish themselves and start eating spider mites faster than the mites can reproduce. After a month, you should see a marked difference. If you’re less than six weeks from harvest, using predators would be a waste of money. Do you have this much time before harvest?
Your luck will improve when you do some hard research and stop listening to hearsay. Check out naturescontrol.com for a little more information. There are quite a few kinds of ladybird beetles (ladybugs), none of which prefer spider mites as a main meal.
Actually, the ladybird-beetle larvae eat the bulk of the bad bugs. But they prefer fat, juicy aphids to scrawny spider mites. Ladybugs also have an affinity for high-intensity discharge light (HID): They fly directly into the hot lamps and pop like popcorn. All of this means that introducing ladybugs is a terrible way to control spider mites.