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| Siekmann, Gitta; Hommes, Martin. |
| One way to prevent the colonisation of crops by insect pests is to disrupt their host finding behaviour. As immigrating aphids alight on potential host plants using optical stimuli, this process can be manipulated by altering the contrast between plant and background. This study aims to test the aphid repelling properties of straw mulch in vegetables. We applied straw to broccoli, head lettuce, bush bean, vegetable broad bean and carrot. The trials were conducted in 2002 and 2003 at several locations in the area of Brunswick, North Germany. Numbers of aphids were insignificant in carrots but noticeably reduced in mulched broccoli, bush bean and broad bean (Brevicoryne brassicae and Aphis fabae respectively). However, this result was significant only in... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: "Organics" in general; Vegetables. |
| Ano: 2005 |
URL: http://orgprints.org/3289/1/3289.pdf |
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| Siekmann, Gitta; Hommes, Martin. |
| Protecting crops with insect fences is currently being considered as an alternative to row cover netting and synthetic insecticides. Previous studies reported efficacies of such fences with 50-90 % reduction in crop damage by root flies. We conducted trials with a 1.70 m fence over two years to monitor carrot rust fly (Psila rosae) in carrots and cabbage root fly (Delia radicum) in radish. There was a significant reduction in cabbage root fly damage in fenced plots whereas no such effect could be found with carrot rust fly. The structure of the overhang at the top of the fence and the mobility of this particular species may be important elements to consider in fence design. The length of the overhang also seemed to be important for cabbage root fly (Delia... |
| Tipo: Report |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2005 |
URL: http://orgprints.org/9072/1/Fence_IOBC_Organic_eprints.pdf |
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