Physical Barriers for the Control of Insect Pests

Crop border and mineral oil sprays used in combination as physical control methods of the aphid‐transmitted potato virus Y in potato

“…Oil was applied 7 times in 2004 (16, 22 and 29 July and 5, 12, 19 and 26 August), 9 times in 2005 (29 June, 7, 14, 22 and 28 July and 4, 11, 18 and 25 August) and 15 times in 2006 (22 June, 1, 6, 12, 17, 20, 27 and 31 July and 3, 10, 14, 17, 24, 28 and 31 August). Defoliation of the potato crop in the experimental field by the Colorado potato beetle was prevented by the installation of a plastic‐lined trench barrier between it and the other fields,3 application of Bacillus thuringiensis subsp. morrisoni (Novodor; Valent BioSciences) at 6 L ha −1 on 22 July 2004, 30 June and 12 and 22 July 2005 and application of spinosad (Entrust; Dow AgroSciences) at 2 oz acre −1 (140 g ha −1 ) on 1, 6, 27 and 31 July 2006.…”

“…Physical barriers consist of a structure made up of a living or inanimate substrate used to obstruct or close a passage or to fence in a space 3. The concept of using a crop border as a barrier to protect the same crop or another crop from non‐persistent virus diseases has been investigated by a few authors but has resulted in divergent conclusions on their effectiveness 4.…”

Impact of Ultraviolet-blocking Plastic Films on Insect Vectors of Virus Diseases Infesting Crisp Lettuce

“…Among insect control methods, physical barriers continue to play a significant supporting role today and are likely to have a significant role in the integrated pest management (IPM) programs of the future (Boiteau, 2002). The use of UV-blocking cladding materials can play a part in IPM programs for crop protection in greenhouses (Antignus and Ben-Yakir, 2004) because they are compatible with the use of biopesticides (Costa et al, 2001) and natural enemies (Chyzik et al, 2003).…”

Assessment of Barrier Materials to Protect Plants from Florida Leatherleaf Slug (Mollusca: Gastropoda: Veronicellidae)

“…Additionally, ambient precipitation and above-ground irrigation can be problematic, perhaps necessitating frequent replacement of the material. Plant collars are recommended occasionally for suppression of oviposition by root feeding insects such as cabbage maggot, Delia brassicae (Wiedemann) (Diptera: Anthomyidae) (Boiteau & Vernon 2001), and Table 5. Mean % (± SE) moisture content of material applied as barrier when in contact with wet or dry soil, and high or low humidity, for 24 h. Soil moisture levels averaged 25 and 0.4% at the high and low soil moisture levels, respectively.…”