What are the green bottles perched on sticks by crops used for?

I'm guessing you have seen pheromone traps that are used in cotton growing areas to trap boll weevils to access their numbers as a part of eradication efforts.

Here is a picture:

http://www.utextension.utk.edu/fieldCrops/cotton/cotton_insects/imagesweev_trap.JPG

Is that what you have seen?

First answer by JMSok. Last edit by JMSok. Contributor trust: 31 [recommend contributor]. Question popularity: 7 [recommend question]

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