Horiver traps are a two-sided sticky card constructed out of durable recyclable plastic. The 'sticky' is a long-lasting glue that is non-toxic, water-repellent and does not dry out. For accurate and simple monitoring a grid is printed on one side. Most flying insects such as whitefly and shore fly are attracted by the coloured traps and stick to them.
Yellow sticky cards are not recommended for use with beneficial wasps.