The chromotropic traps are colored bands covered with glue whose operating principle is based on the exploitation of the attractive power of pheromones (the volatile substances produced by insects and used to communicate with each other), to deceive and trap them: in this case, the attraction that some colors exert on parasites.
They are rectangular sheets, generally as large as an A4 sheet, made with waterproof material and resistant to atmospheric agents, moreover the attractive substances with which they are impregnated have no toxicity both for humans and for the environment: for this reason they are used in organic and biodynamic crops.
Chromotropic traps: colors
The chromotropic traps are made in three colors:
- light blue
-The yellow traps are used for the control of the cherry tree fly, the olive tree, the fruit, the olive moth, the whitefly, the leafhoppers, some miners, aphids and scaridae. They have the defect of being not very selective and therefore also attract other insects, not only the "neutral" ones but also those useful for the defense of the crop.
-The light blue traps are particularly suitable for catching thrips: one or two every 50 square meters is enough to already have excellent results.
-The white traps are very suitable for monitoring and capturing the pear's sawdrops and are one of the most effective interventions in the event of an attack by this parasite
Chromotropic traps: operation
They can be a valid system to monitor crops or to defend them.
In the first case, 7 traps are generally needed every 1000 square meters of surface distributed evenly to monitor the presence of harmful insects and better plan any subsequent defense interventions, understanding for example the best time to operate.
Instead, if you want to make a massive capture, the number of traps must increase considerably and the same 7 traps must be distributed in a much smaller area, which usually does not exceed 50 square meters; obvious that, when all the gluey surface is covered with insects, the trap has done its job extensively and needs to be replaced.
For an effective use, it is advisable to place the traps well in advance of the period of fluttering of the parasites, and in sufficient numbers, at least ¾ per hectare: they must be replaced approximately every 20 days.
This technique allows not only savings in money, but above all, a great reduction in pollutants emitted into the environment such as the products used for the care of crops.
Chromotropic traps: where to buy them
The chromotropic traps I'm purchasable on Amazon following this link. They are cheap and you will find many variations depending on your needs.