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
dc.contributor.author | Pringle K.L. | |
dc.contributor.author | Heunis J.M. | |
dc.date.accessioned | 2011-05-15T15:53:28Z | |
dc.date.available | 2011-05-15T15:53:28Z | |
dc.date.issued | 2008 | |
dc.description.abstract | 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 by simply classifying the 25 trees as infested or uninfested, as opposed to counting colonies in leaf axils. The presence-absence system greatly reduced the time spent monitoring E. lanigerum population levels, making it an attractive system for assessing woolly apple aphid infestations in commercial orchards. | |
dc.description.version | Article | |
dc.identifier.citation | African Entomology | |
dc.identifier.citation | 16 | |
dc.identifier.citation | 1 | |
dc.identifier.issn | 10213589 | |
dc.identifier.other | 10.4001/1021-3589-16.1.41 | |
dc.identifier.uri | http://hdl.handle.net/10019.1/8618 | |
dc.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 | |
dc.type | Article |