How do you apply milky spore to become effective? I've red that you must apply in April, May, June, July, and August as a base for tranforming a lawn organically. What kinda precautions do I have to be aware of using a product like this? Can the customer run on the lawn after or what? Also... Were can I get Nematodes? Do I really need a diaphram sprayer to apply them? I've heard piston's will kill them from the pressure?