Sampling procedures for spittlebug adults in pastures of Brachiaria decumbens.

• Autor(a) principal: NILAKHE, S. S.
• Data de Publicação: 1984
• Outros Autores: SILVA, A. A. da, SOUZA FILHO, J. A. G. de
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
• Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/319774
• topic: Spittlebugs; Pasture; Amostragem; Brachiaria Decumbens; Cigarrinha das Pastagens; Deois Flavopicta; Pastagem; Zulia Entreriana; Cercopidae; sampling

A sampling study of spittlebug adults in pastures of Brachiaria decumbens was conduced to find an appropriate number of sweep-net sweeps/sample. Considering the relative variation (SE/X) X 100, and the total number of sweeps in the sampling, 10 sweeps/sample were found to be better than 5,20 our 40. The number of samples required for a particular level of relative variation at population densities>16 spittlebug adults/10 sweeps remained the same, whereas at densities<16, the number increased inversely. A regression model to convert relative estimates obtained by sweep-net method to the absolute estimate was presented. Considering the degree of precision and the time spent in sampling, the sweep-net method was superior to cage method. The distribution pattern of numbers of spittlebug adults in samples of 10 sweep-net sweeps, generally fitted the poisson series. A sequential plan presented here would reduce the sampling time over the conventional (fixed sample numbers) sampling.