Ca. 100 square miles of an irrigation district in southwestern Oklahoma were sampled forHeliothis zeaBoddie. MostH. zeawere found on sorghum, cotton, and alfalfa. Alfalfa was the principal host for June. In JulyH. zeawas found on all 3 crops and in August they were mainly on cotton. The distribution patterns fit the negative binomial withkvalues ranging from 3.00 in sorghum to over 5.00 in alfalfa. Parasitism rates were much higher in alfalfa (72%) than for sorghum (6%). or cotton (5%). The most common parasites are listed and their distribution patterns given.