Color trap means control of pests using color. The theme is that, here the color has been used either as attractant or as repellent. Because we all know that many insects show the positive or negative taxis against diverse range of colors.
Dear Ammar,
Many insects are attracted by coloured objects or coloured (sticky) traps. Colours are determined by the long evolution history of insects, aim of them was to find food or any other resources or to distribute for better surviving. These traps are widely used in pest forecasting, e.g. yellow sticky traps are used for Meligethes aeneus, various Ceutorhychus and Rhagoletis spp.
http://actazool.nhmus.hu/62/2/ActaZH_2016_Vol_62_2_165.pdf
Colored traps can be used for differet aims, as monitoring and controlling different insect pests. These traps have different colors according to the insect pest targeted. Insect can see certain wave lenght. These traps may differ in shaps also.
Please see:
https://bughunter.tamu.edu/collection/colors/
http://chittkalab.sbcs.qmul.ac.uk/2001/BriscoeChittka_AnnRevEnt01.pdf
https://www.arbico-organics.com/category/color-sticky-traps
Dear Professor,
Colored Objects, Sticky Traps, and Yellow Pan Traps. Colored objects and stickytraps. ... Yellow pan traps (with salt water). Shallow trays, generally painted yellow on the inner surfaces and filled with a fluid such as salt water, can be used to attract and trap small flying insects such as winged aphids.
Color can be used for improve traps or to attract insects to the traps, as yellow traps for aphids or blue for thrips. Also color could be used to reduce the amount of non target insects in monitoring traps (orange or red traps for moth monitoring).
A possibly useful resource may be this study:
http://cstem.uncc.edu/sites/cstem.uncc.edu/files/media/SV/2012/FBE/Chris%20Hering%20-%20Differential%20Attraction%20of%20Insect%20Orders.pdf
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