Binomial sequential sampling of adult Saccharicoccus sacchari on sugarcane |
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Authors: | P. G. Allsopp |
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Affiliation: | (1) Bureau of Sugar Experiment Stations, P.O. Box 651, 4670 Bundaberg, Queensland, Australia |
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Abstract: | The between-stalk dispersion characteristics of adults of the pink sugarcane mealybug Saccharicoccus sacchari (Cockerell) were determined in southern Queensland. Iwao's patchiness regression was inappropriate to describe the relationship between mean and variance. Taylor's power law indicated that adults were aggregated, especially at the beginning and end of the ratoon growth period. Binomial data were modelled by the Nachman model; the model of Grout and two models of Wilson & Room were inappropriate to describe the relationship between proportion of stalks infested and mean numbers of adults per stalk. Relationships to determine sample sizes for fixed levels of precision and binomial fixed-precision-level stop lines are developed for different sampling times using Taylor's power law and Nachman's equation. |
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Keywords: | Hemiptera Pseudococcidae Saccharicoccus sacchari pink sugarcane mealybug sampling sugarcane |
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