Insect exclusion screens: the size of the holes from a three-dimensional perspective
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URI: http://hdl.handle.net/10835/15634
ISSN: 0567-7572
ISSN: 2406-6168
DOI: https://doi.org/10.17660/ActaHortic.2017.1170.133
ISSN: 0567-7572
ISSN: 2406-6168
DOI: https://doi.org/10.17660/ActaHortic.2017.1170.133
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2017Abstract
Insect-proof screens are considered as flat bodies. However, from a microscopic point of view a screen is not a flat body but, on the contrary, the spatial arrangement of the threads determines that the passage surface for an insect is larger than the one obtained in the measures made on images in orthogonal projection. This paper compares the effectiveness against Bemisia tabaci of different types of screens and
perforated sheets. A perforated sheet has a negligible thickness and therefore, the comparison between these two types of physical barriers allows determining qualitatively the importance of the spatial arrangement of the threads on the efficacy of the screens. It also compares the efficacy between screens with similar hole widths to assess the validity of the “prison effect” as design criteria. The results show that if
screens are used smaller holes (measured in orthogonal projection) are needed in comparison to the holes of the perforated sheets to obtain similar values of...
Palabra/s clave
Bemisia tabaci
perforated sheets
efficacy tests