Yellow sticky traps are a common method for monitoring many pests, but it has not been shown whether they could be used as a control method. In the greenhouse, yellow sticky traps significantly suppressed the population increase of adult and immature whiteflies. The whitefly densities in the greenhouse with traps were significantly lower than the greenhouse without traps. In the field, traps did not have a significant impact on the population dynamics of adult and immature whiteflies. The densities in fields with traps were very similar to fields without traps. These results suggest that KMERLIFE yellow sticky traps can be used as an effective method for the control of whiteflies in the greenhouse. This information will prove useful for the effective management of whiteflies in greenhouses.
The yellow sticky trap was made of art paper, or in all kinds shape. The art paper was painted lemon yellow on both sides, sealed with a thin transparent plastic cover, and smeared with sticky glue. During the experiments, the traps were hung about 30 cm above the crop canopies and could be adjusted vertically whenever the crop attained additional growth.
Colored objects and sticky traps. A number of groups of insects are attracted to specific colors, and colored objects have been used to develop trapping devices for collecting insects and monitoring their populations. Horse and deer flies, for example, are attracted to shiny black objects such as beach balls. These are used to increase attract these species to canopy or malaise traps. Yellow is attractive to many insects commonly found in gardens or greenhouses, including winged adult white flies, aphids, leaf miner flies, fungus gnats and thrips (which are also reportedly attracted to blue). Colored cards or other objects such as plastic disposable drinking cups coated with a sticky substance make excellent traps to collect and monitor populations of these insects.
As the value of insect scouting is better realized, more growers are using yellow sticky traps in greenhouses to monitor pest populations. It seems worthwhile to discuss the identity of insects which are attracted to the traps. Being able to recognize the most common insects found on sticky traps allows the grower to select an appropriate pest control strategy. Additionally confusing the matter, aphids also have winged forms that are attracted to yellow sticky traps. Were the greenhouse to have an established population of leafminers, then there is a good chance that beneficial tiny parasitic wasps will also show up on the traps. Whiteflies are also attracted to these traps. As whiteflies are entangled in the adhesive, they change from snowy white to orange. In this orange condition, whiteflies could be confused with thrips, which also appear orange on the sticky traps.
When insects alight on a yellow sticky trap, they immediately struggle and become ensnared in the adhesive, often in awkward positions. The wings may be free of the adhesive or glued down securely. The wings are very important for identification. Antennae (feelers) on the heads of insects are also useful for identification. Unfortunately, they are fragile and may break off. The antennae and microscopic hairs of thrips almost always break off in the adhesive when trying to remove thrips for species determination. However, the yellow traps can be used to monitor whether thrips populations are rising or falling.
So obvirously, yellow sticky trap is an effective method of catching pests. See the common pets KMERLIFE yellow sticky trap can catch.
The wings of aphids often settle symmetrically on each side of the body. Sometimes these trapped aphids give birth to several nymphs before they die and their bodies shrivel up. After a few days, aphids look like a tiny version of "road kill", that is, only parts of them can be recognized. Fortunately, the front wings of aphids usually have two parallel veins close to the front edge. The legs and antennae of aphids are often long and skinny as well.
Fungus gnats are small, dark, mosquito-like insects with only two gray wings. Each wing has a distinct, Y-shaped vein at the tip. Fungus gnats have relatively long, skinny legs and antennae.
Leafminer flies are shaped like eye gnats and have only two wings. Unless the specimen is completely mired in the adhesive, it is possible to see a conspicuous yellow spot on each side. Leafminer flies have a short antennae and legs that are of moderately long.
Parasitic wasps usually have antennae elbowed like those of ants. The forewings have only one vein which zigs toward the front margin and zags away. Typically, there may be a few on each trap. Usually parasitic wasps are more pointed at the rear than flies and have four wings instead of two. If you have lots of tiny parasitic wasps on the traps, something peculiar is happening.
Shore flies are the largest flies commonly found on sticky traps other than an occasional house fly or horse fly. Shore flies are about the size of the fruit flies (vinegar flies) that are attracted to sliced tomatoes or melons in the summer, but shore flies are dark with dark eyes, legs, and wings. The antennae are short and the legs are moderately long. The wings (only two) often have noticeable light spots.
Thrips are the tiniest insects found in any abundance on sticky traps. Thrips seem to fold heir wings over their abdomens before sinking into the adhesive. They seem to accept their fate without struggle. Consequently, most specimens appear spindle-shaped with the wings protruding neatly at the rear. Wings are coated with hairs, but you may have to look closely at several specimens to detect the fringed edges. Stocky antennae may protrude in a V-shape at the front. These antennae are more fragile than they may appear.
Whiteflies lose their white, waxy bloom as they are entrapped by the adhesive. The Insect shows its true orange color and its fragile nature on the traps. Whiteflies are only a little larger than thrips. Usually enough of a wing or leg or other part protrudes about the adhesive so that the white bloom reveals the identity of the whitefly.
This house fly-like fly is turning up in many greenhouses. It is predatory on fungus gnat adults, in particular. It can be quite numerous and is often seen resting on parts of the benches watching for prey.
Many different kinds of insects show up on sticky traps. Even entomologists may not be able to identify them either after being gummed up in the sticky polymers. So species identification of all of the insects on a sticky card may not be possible. Hopefully, this Insect Note will allow you to keep a watchful eye on any problem before it arises.