Claim · model-written summary
Counting only infested leaves per shoot decreased the accuracy of the aphid density assessment.
- Taxon
- apple
Malus domesticae0 - Interactor
- Aphis pomi
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Aphis pomie0pest - Outcome
- accuracye4
- Direction
- decreasee4
- Comparator
- method of counting the number of aphids on the most infested leafe3
Verbatim
e0“Various sampling schemes were evaluated for estimating the population size of the apple aphid, Aphis pomi DeGeer, on an apple tree”
e3“The method of counting the number of aphids on the most infested leaf provided the most accurate assessment of aphid density, but it required the most effort”
e4“Counting only the number of infested leaves per shoot resulted in a decrease in accuracy, but also a 4- to 8-fold decrease in the time required to sample”
Title
Larry A. Hull; Jeffery W. Grimm Environmental Entomology 1983. doi:10.1093/ee/12.5.1581
Other claims from this paper (7)
- Association More aphids inhabited the actively growing shoots in the top of the apple canopy than the bottom.
- Observation About 90% of the aphid population occurred on the first six leaves at the top of the apple tree.
- Observation About 90% of aphids were on the first four leaves at the bottom of the apple tree on all sampling dates.
- Method / resource Counting aphids on the most infested leaf gave the most accurate assessment of aphid density, but required the most effort.
- Method / resource Counting only infested leaves per shoot reduced the time required to sample by 4- to 8-fold.
- Recommendation Sampling only the apple tree areas reachable from the ground gives reliable estimates of the aphid population over the entire tree.
- Observation Sample size estimates are given for the number of apple shoots and trees to sample, with an estimate of precision.