We only do a few lawn pest applications, but i've had terrible results with ants. I have 3 customers that are the worst. I've been using cypermethrin customer 1 I used a spray tank at 2 gallons per1000 s.f. at the labled rate customer 2 I used back pack sprayer at 4 times the labled rate (1/4 gallon per M) customer 3 I used hand- pump sprayer at 3 times the labeled rate..... 1/8 gal. per M So far each customer has ants in there yard still..... how???? How do I kill them!