There is no doubt the bio control industry is growing, so there are many jumping into the business to try and cash in. There are a few terms that are important to understand, so you know whom you are buying from. First there are insectaries, they are the companies that product / grow the bio control agents. There are not many and most will sell direct to growers. I have provided a list of these companies here. Next there are distributors, these are companies and buy and resell the beneficial insects ,mites and nematodes. If is important if you use a distributor that they have a relationship where the beneficials are dropped shipped directly from the insectary to your door. The longer the beneficials are in transit, the greater the chances a problem will occur, impacting the quality of the beneficial. Also, depending on the distributor, they sometimes do not know the beneficials as well as the insectaries do.