Abstract
Advances in sampling technology have made it possible to developbinomial sequential sampling plans for rangeland grasshoppers. Using this technique, grasshopper infestations can be rapidly classified into 'high' or 'low'categories relative to a threshold. We have developed a set of binomial sequential sampling tools, or plans, to assess the level of adult and nymphal grasshopper infestations on rangelands. The adult grasshopper plan was used to assess the level of grasshopper infestations throughout Wyoming, USA, in 1998; this resulted in a 79.5% reduction of the sampling effort. In addition, the adult sequential sampling plan was of sufficient scientific rigour to qualify some ranchers for federal disaster relief funds due to excessive grasshopper feeding. Grasshopper managers should consider using binomial sequential sampling plans wherever and whenever efficient surveys are needed to determine if grasshoppers are a threat to the production of rangeland forage and the maintenance of this ecosystem.
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