He said there are a number of contracts out to grow these parasites, but he hasn't found any successful way of doing it. It is not cost-effective unless you have a steady market. If I grow gwss parasites, it will go away by itself and I will have no market. As long as you have a place to put every insect. Phil Phillips, the Farm Advisor, used to work for Dietrich.
Parasitism comes along very slowly.
Then a lot of adolescents, which means adults all through the spring. Food drives all these systems. If you have a lot of rabbits, you will have a lot of foxes. Then you gotta work among the residues with your parasites. In Filmore, it took about 3 years for it to become less of a pest.