The development of a sampling system for monitoring population levels of the woolly apple aphid, Eriosoma lanigerum (Hausmann), in apple orchards in the Western Cape Province of South Africa

@inproceedings{Pringle2008TheDO,
  title={The development of a sampling system for monitoring population levels of the woolly apple aphid, Eriosoma lanigerum (Hausmann), in apple orchards in the Western Cape Province of South Africa},
  author={K. L. Pringle and Julia Heunis},
  year={2008}
}
A sampling system was developed for monitoring population levels of woolly apple aphid, Eriosoma lanigerum (Hausmann), by counting colonies on half of each of 25 apple trees per 2 ha block. Sampling error was affected by whether the colonies were found in wounds or in leaf axils. Parasitism of colonies in leaf axils had a slight effect on sampling error. Sampling error for colonies in leaf axils was high at just over 40 %. However, decisions regarding intervention were not markedly compromised… CONTINUE READING

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