Sampling for the sugarcane borer (Lepidoptera : Crambidae) on sugarcane inLouisiana

A 3-yr study was conducted in 0.6- to 2.0-ha sugarcane fields throughout so uth Louisiana under varying sugarcane borer, Diatraea saccharalis (F.), den sity levels to determine the spatial dispersion of infestations and to deve lop a sequential sampling plan. Infestations of D. saccharalis were randoml y dispersed. Infestation levels (percentage of stalks infested) ranged from 0.6 to 33.3%. Frequency distributions of the number of infested stalks ind icated that the Poisson distribution best fit the data. Tests of other dist ributions (negative binomial [aggregated], binomial [uniform], geometric, a nd hypergeometric) resulted in poorer fits. The sequential sampling plan de vised, with lower and upper D. saccharalis infestation limits of 2 and 5% a nd 5 and 10%, required maximum average sample numbers of 7.1 and 5.5 (20-st alk samples), respectively. to make terminating management decisions. It is our assessment that implementation of these plans would decrease sampling effort by 50-60% when compared with sampling programs currently. in use for D. saccharalis management decisions in Louisiana.