Before you can remove them you'll have to identify them. Luckily for us, thrips leave telltale signs of damage that can be easy to spot. Read on to learn how to identify these pesky little creatures before they wreak too much havoc on your plants!
Thrips are an incredibly diverse group of tiny insects that belong to the order Thysanoptera. Although reputable national organizations, like the National Plant Board and the National Plant Diagnostic Network, recognize the existence of over 7,000 different thrips species, there isn’t even a general consensus about the number of different types of thrips in the scientific community — and individual thrips species can have extremely diverse impacts on your garden.
Many thrips species feed on decaying organic substances such as leaves and other dead insects, while others eat fungi. These thrips pose no threat to your garden or farm. A few thrips species, aptly called beneficial thrips, even target garden pests like aphids, whiteflies, and other thrips. These can be actively helpful.
The thrips you will be concerned about can, on the other hand, cause extensive plant damage and even loss. As they feed on stems, flowers, and leaves, the plant can develop visible signs of insect activity, and eventually wilt. That isn’t all, though, as pest thrips can also carry over 20 different types of plant viruses that can ravage your garden. You don’t want these kinds of thrips anywhere near your well-maintained flowerbeds, vegetable garden, or fruit trees, but how can you identify them?
Keeping in mind that there are thousands of different thrips species, some helpful things to know about the general appearance of most thrips include:
Successfully identifying thrips is, unfortunately, much more difficult than spotting a mosquito, a tick, or a fly. Not only are pest thrips rather fast, despite their poor flying abilities, they also tend to be truly tiny. This makes identifying thrips a challenge even for experienced entomologists. If you do happen to see thrips, they are most likely to appear as small long bugs that quickly slither or dash across a leaf or flower without offering you the chance to get a closer look.
Even if you do manage to get a thrips, or a couple, into a glass jar for closer study, you will find it extremely tricky to determine what type of thrips you are dealing with. Often, the best way to tell that you have pest thrips in your plants is to look at the damage these pests have caused. Getting rid of them is often the only way to save infected plants.
Fortunately, you do not have to see thrips in action to be able to tell that you likely have pest thrips in your garden. Looking at the ways in which your plants were damaged can offer important insights:
Western flower thrips, which are among the most common pest thrips, can feed on a wide variety of plants, from jewelweed to roses, and from grapes to peppers. These thrips are also responsible for a shocking variety of plant diseases. The damage caused by this common nuisance can be seen as lighter and darker spots on leaves, as well as shriveled and deformed leaves and petals. Some of the plants may die, and the plant diseases thrips carry can spread to other plants as well.
If you do suspect that you have thrips in your plants, the ideal course of action would be to consult pest control professionals about integrated pest management. This approach combines environmentally-friendly steps, such as the introduction of predators that eat pest thrips, with pesticides.