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Descripción
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| The reduction on the amount of UV radiation that penetrates a UV-absorbent cover has an influence not only on the plant but on pests and natural enemies as well and the effect could be mediated by the presence or absence of crop. In this work, the effect of a UV-absorbing net (Bionet®) on the flying capacity of the braconid Psyttalia concolor, parasitoid of the olive fruit fly and the chrysopid Chrysoperla carnea, a cosmopolitan and frequent enemy of Prays oleae were studied in the presence and absence of crop. Assays were done in Central Spain in summer 2009 and spring-summer 2010, on semi-commercial tunnels (6.5 x 8 m) covered by a UV-absorbent (Bionet®) or an standard commercially available net. Each tunnel was divided in 2 compartments with individual entrances, and insects were released on a 1.5 m high platform placed in the centre. Yellow sticky traps (20 x 13 cm), hanged at a height of 2 m above the soil level were used to recover insects. Traps were changed at regular intervals after the release. Experiments were repeated in two different dates. Temperature, relative humidity, PAR and UV radiation were recorded during the assays. In the first experiment, 200 specimens of every species were released per compartment in summer 2009, when a tomato crop had a height of about 50 cm. A total of 8 commercial yellow traps were placed 2 per side, directly on the tunnel mesh with the aid of a safety pin and replaced 5 times in two consecutive days. The second experiment was performed in spring-summer 2010 with bare soil. In this case, 300 specimens of every species were released as described above and a total of 18 traps per compartment replaced 3 times at 2 hours intervals after the release were used. Traps were hanged in a circular structure with three concentric rings at a distance of 0.5- 1- and 1.5 m from the release platform, with 3-6 and 9 traps, respectively. Results showed that both natural enemies seemed not to be affected by the absorption of UV-A and UV-B radiation in the range of 280-400 nm by the UV-absorbent net studied, because the average number captured per trap was not significantly different in the two nets irrespective of the presence and absence of crop or the trap location. | |
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Internacional
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Si |
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Nombre congreso
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IOBC/wprs Integrated protection of olive crops |
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Tipo de participación
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960 |
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Lugar del congreso
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Israel/Jerusalem |
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Revisores
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Si |
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ISBN o ISSN
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0000-00-000-0 |
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DOI
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Fecha inicio congreso
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15/05/2008 |
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Fecha fin congreso
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20/05/2011 |
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Desde la página
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0 |
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Hasta la página
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0 |
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Título de las actas
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xxx |