These handy double sided cards (blue on one side, yellow on the other) measure 3.5" x 8" and will trap thrips, white flies, fruit flies, aphids, hoppers and many other pests. A great way to control pests without using chemicals. 5 cards per pack - includes hanger.
these traps work well to monitor occurrence of pest in your greenhouse or garden. They are typically not used to diminish populations (of aphids, whiteflies etc) but rather so see if they are present and to what degree populations are rising or diminishing. The actual pest control should then be carried out with other means. The yellow traps should be checked in regular intervals (such as daily at the same time of day) to be able to observe population dynamics.