The impact of varying aphid populations in different shadehouse structures on some physical characteristics of head lettuce, cultivated in the central Free State (South Africa)
Published Article === Direct feeding damage to head lettuce (Lactuca sativa L.) by varying aphid populations in two differently constructed shadehouse structures (fully- and partially covered) was examined. Fresh lettuce head weight, the number of lettuce leaves formed, and the number of lettuce lea...
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Journal for New Generation Sciences, Vol 10, Issue 1: Central University of Technology, Free State, Bloemfontein
2015
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Online Access: | http://hdl.handle.net/11462/602 |
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ndltd-netd.ac.za-oai-union.ndltd.org-cut-oai-ir.cut.ac.za-11462-6022016-03-16T03:59:04Z The impact of varying aphid populations in different shadehouse structures on some physical characteristics of head lettuce, cultivated in the central Free State (South Africa) Pretorius, R.J. Louw, S. vd M. Venter, P. Vd. Westhuizen, C Central University of Technology, Free State, Bloemfontein Aphid feeding Damage Injury Lettuce head weight Published Article Direct feeding damage to head lettuce (Lactuca sativa L.) by varying aphid populations in two differently constructed shadehouse structures (fully- and partially covered) was examined. Fresh lettuce head weight, the number of lettuce leaves formed, and the number of lettuce leaves infested with aphids were compared between the two structures. Warmer months showed a significant lower fresh lettuce head weight in the fully covered structure with more aphid-infested leaves. During June/September, the mean number of aphid-infested leaves and aphid infestation levels were significantly higher in the partially covered structure. Visible feeding damage to the lettuce crop was restricted, but asymptomatic damage in terms of a decrease in head weight did occur under severe infestation levels. 2015-10-01T11:10:21Z 2015-10-01T11:10:21Z 2012 2012 Article 16844998 http://hdl.handle.net/11462/602 en_US Journal for New Generation Sciences;Vol 10, Issue 1 Central University of Technology, Free State, Bloemfontein 105 389 bytes, 1 file Application/PDF Journal for New Generation Sciences, Vol 10, Issue 1: Central University of Technology, Free State, Bloemfontein |
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Aphid feeding Damage Injury Lettuce head weight |
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Aphid feeding Damage Injury Lettuce head weight Pretorius, R.J. Louw, S. vd M. Venter, P. Vd. Westhuizen, C The impact of varying aphid populations in different shadehouse structures on some physical characteristics of head lettuce, cultivated in the central Free State (South Africa) |
description |
Published Article === Direct feeding damage to head lettuce (Lactuca sativa L.) by varying aphid populations in two differently constructed shadehouse structures (fully- and partially covered) was examined. Fresh lettuce head weight, the number of lettuce leaves formed, and the number of lettuce leaves infested with aphids were compared between the two structures. Warmer months showed a significant lower fresh lettuce head weight in the fully covered structure with more aphid-infested leaves. During June/September, the mean number of aphid-infested leaves and aphid infestation levels were significantly higher in the partially covered structure. Visible feeding damage to the lettuce crop was restricted, but asymptomatic damage in terms of a decrease in head weight did occur under severe infestation levels. |
author2 |
Central University of Technology, Free State, Bloemfontein |
author_facet |
Central University of Technology, Free State, Bloemfontein Pretorius, R.J. Louw, S. vd M. Venter, P. Vd. Westhuizen, C |
author |
Pretorius, R.J. Louw, S. vd M. Venter, P. Vd. Westhuizen, C |
author_sort |
Pretorius, R.J. |
title |
The impact of varying aphid populations in different shadehouse structures on some physical characteristics of head lettuce, cultivated in the central Free State (South Africa) |
title_short |
The impact of varying aphid populations in different shadehouse structures on some physical characteristics of head lettuce, cultivated in the central Free State (South Africa) |
title_full |
The impact of varying aphid populations in different shadehouse structures on some physical characteristics of head lettuce, cultivated in the central Free State (South Africa) |
title_fullStr |
The impact of varying aphid populations in different shadehouse structures on some physical characteristics of head lettuce, cultivated in the central Free State (South Africa) |
title_full_unstemmed |
The impact of varying aphid populations in different shadehouse structures on some physical characteristics of head lettuce, cultivated in the central Free State (South Africa) |
title_sort |
impact of varying aphid populations in different shadehouse structures on some physical characteristics of head lettuce, cultivated in the central free state (south africa) |
publisher |
Journal for New Generation Sciences, Vol 10, Issue 1: Central University of Technology, Free State, Bloemfontein |
publishDate |
2015 |
url |
http://hdl.handle.net/11462/602 |
work_keys_str_mv |
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