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Sampling plants for spittlebug eggs in pastures of Brachiaria decumbens. Repositório Alice
NILAKHE, S. S.; MARTIN, P. B.; VALERIO, J. R.; KOLLER, W. W.; SOUZA FILHO, J. A. G. de; SILVA, A. A. da.
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...
Tipo: Artigo de periódico Palavras-chave: Sampling efficiency; Sequential sampling; Amostragem sequencial; Eficiencia da amostragem; Deois Flavopicta; Zulia Entreriana; Cercopidae.
Ano: 1984 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1113556
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Sampling procedures for spittlebug adults in pastures of Brachiaria decumbens. Repositório Alice
NILAKHE, S. S.; SILVA, A. A. da; SOUZA FILHO, J. A. G. de.
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...
Tipo: Artigo de periódico Palavras-chave: Spittlebugs; Pasture; Amostragem; Brachiaria Decumbens; Cigarrinha das Pastagens; Deois Flavopicta; Pastagem; Zulia Entreriana; Cercopidae; Sampling.
Ano: 1984 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/319774
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