Sampling plants for spittlebug eggs in pastures of Brachiaria decumbens.

• Autor(a) principal: NILAKHE, S. S.
• Data de Publicação: 1984
• Outros Autores: MARTIN, P. B., VALERIO, J. R., KOLLER, W. W., SOUZA FILHO, J. A. G. de, SILVA, A. A. da
• 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/1113556
• topic: Sampling efficiency; Sequential sampling; Amostragem sequencial; Eficiencia da amostragem; Deois Flavopicta; Zulia Entreriana; Cercopidae

A sampling study of spittlebug eggs in pastures of Brachiaria decumbens was conducted by using a sample unit of 15 x 15 cm. The number os samples required for a certain level of precision was inversely proportional to population density. A crude estimate of number of samples necessary for 10, 15 and 20% of precision were 133,59 and 33, respectively. A study of sampling variation showed that differences between plots were much more important than the block differences; therefore plot to plot variation must be considered while sampling spittlebug eggs. The distribution pattern of numbers of eggs per 225 cm2 of pasture fitted the negative binomial series. The sequential sampling plan presented here would reduce the sampling time over the conventional (fixed sample numbers) sampling.