Western flower thrips, Frankiniella occidentalis

Western Flower Thrips is a type of thrips common on leaf plants, flowers, and veggies.

Western Flower Thrips facts

Name – Frankliniella occidentalis
Order – Thysanopthera
Sub-order – Terebrantia

Danger – low, may spread fatal virus

Distribution: worldwide – Target hosts: over 250

This tiny pale-yellow thrips might contaminate your tomato plants with the fatal tomato spotted wilt virus. But for other plants, damage is mostly cosmetic.

Damage caused by Western Flower thrips

Key symptoms most certainly reveal an infestation of Western flower thrips.

Tomato Spotted Wilt Virus

A devastating disease is transmitted by Western Flower thrips as it feeds from one plant to the next.

A thrips that has fed on an infected plant at any stage of its lifecycle will infect all other plants it may feed on.

Many plants of the Solanaceae family can catch the disease if a contaminated thrips lands and feeds on them: tomato, potato, eggplant…

Other families can also catch the disease: Capsicum (chili and bell pepper plants) and lettuce will also suffer from this viral plant illness.

Symptoms of Western Flower thrips on plants

A colony of Western Flower thrips will result in cosmetic damage mostly. In some cases like vegetables or fruits, however, the harvest may be reduced in quality and quantity, too. The damage is similar to that of other thrips.

What does thrips damage look like?

A few telltale signs are the following:

silver-white patches on leaves, these turn yellow-brown after while
black specks littered on the under and oversides of leaves.
As the white patches spread, leaves may start twisting and scarring.
On colored flowers, you’ll notice white spots on petals.
Of course, you might glimpse the tiny insects themselves.

As a result, ornamental flowers aren’t as beautiful. Fruits and vegetables are smaller and the harvest is less abundant, and they may even be scarred and unsalable.