A comparison of sampling methods for bluegreen lucerne aphid (Acyrthosiphon kondoi) in Canterbury,New Zealand |
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Authors: | B. H. Rohitha D. R. Penman |
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Affiliation: | 1. Department of Entomology , Lincoln College , Canterbury , New Zealand;2. Crop Protection Division, Coconut Research Institute , Lunuwila , Sri Lanka;3. Department of Entomology , Lincoln College , Canterbury , New Zealand |
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Abstract: | Abstract Sampling of bluegreen lucerne aphid showed that the most efficient method differs according to the time of year and the height of the lucerne. In late June 1976, when the lucerne was short (mean height 3.6 cm), an area removal sample of 700 cm2 was more efficient to achieve a 10% degree of precision (half-width of a confidence limit) than area samples of 80 and 300 cm2, suction sampling of the same areas, and stem sampling. In early spring (lucerne height 11.7 cm) the 80 cm2 area removal sample was the most efficient. Just before the second hay cut (late January), the length of lucerne stems (62.5 cm) precluded use of any area removal technique; stem samples were most efficient. The cost in time was fuliy considered in sampling method comparisons. Possible differences with population density were not considered. |
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Keywords: | Homoptera Aphididae Acyrthosiphon kondoi lucerne sampling methods relative efficiency cost effectiveness |
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