Abstract
In 2 years, the spatial distribution of Heliothis zea (Boddie) and H. virescens (F.) larvae on cotton squares as determined by three sampling methods, 10-square, 25-consecutive-square, and 2-linear-meter, fit a Poisson distribution in 56 of 64 tests in fields 1 to 3 weeks before insecticide applications and during the growing season when insecticides were applied 13 to 17 times. Both years, the spatial distribution of injured squares determined by the 10-square method fit a Poisson distribution in 34 of 35 tests. The first year, the 25-consecutive-square method fit a negative binomial distribution in 19 of 20 tests, and a common k = 1.87 was estimated. The next year, distribution of injured squares from the 10-square method fit a Poisson distribution in 15 of 15 tests. In 9 of 11 tests, spatial distributions of injured squares determined by both the 25-consecutive square and the 2-linear-meter methods fit a negative binomial distribution, and estimated values of common k were 0.65 and 1.15, respectively. Nevertheless, each sampling method would detect an infestation at the economic threshold levels of 5 and 10% damaged squares in South Carolina.
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