Biological Pest Control and Integrated Pest Management

Thrips Pests

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Introduction to Thrips

Single Thrip

Thrips pests are tiny insects from the order Thysanoptera, posing significant risks to growers worldwide. With over 4,500 species, these insects frequently invade greenhouses and indoor plants, especially floral crops. Thrips cause extensive plant damage and transmit serious diseases, making their management vital.

Why Are Thrips Problematic?

Thrips Body Closeup

Thrips enter growing environments through several ways. They often hide year-round within greenhouse structures or hitch rides on new plants brought in from outside. Their ability to fly long distances, supported by fringed wings, further complicates their management, highlighting the importance of early detection and immediate control measures.

Damage Caused by Thrips

Female thrips reproduce rapidly, embedding eggs safely inside plant tissues. Although laying eggs itself doesn’t cause major harm, thrips primarily damage plants through their feeding habits. By scraping plant cells and sucking out the sap, they leave silvery scars and distorted patterns on leaves. Thrips also transmit harmful plant viruses, including impatiens necrotic spot virus (INSV) and tomato spotted wilt virus (TSWV).

Life Cycle and Habits of Thrips Pests

Black and White image of a Thrip

The lifecycle of thrips pests is rapid, especially in warm conditions, taking as little as 14 days from egg to adult. During cooler weather, their lifecycle extends up to a month. Thrips pests spend larval stages deeply embedded in flowers or buds, complicating chemical treatments.

Effective Scouting for Thrips Pests

Regular monitoring is vital for the early detection of thrips pests. Growers typically use yellow or blue sticky traps. Additionally, direct plant inspections and gentle shaking or blowing into flowers can help reveal hidden thrips pests. Plants such as petunias, asters, and fava beans can act as indicators of infestation.

Integrated Pest Management for Thrips Pests

Thrip under a microscope

An effective strategy against thrips pests includes exclusion methods such as fine insect screens and careful plant inspections. Using trap crops to attract and identify infestations is beneficial. Combining chemical treatments during peak activity times with biological controls provides a comprehensive solution.

Biological agents, like predatory mites (Neoseiulus cucumeris and Stratiolaelaps scimitus), target different stages of thrips pests. Applying these preventive and aggressive biocontrol methods significantly enhances management outcomes.

Some Advice

Somewhere between a complete and incomplete metamorphosis, thrips have a unique way of growing up. For at least some species, two of their stages —the prepupal and pupal stages —are spent in the soil, growing medium, and other friable materials. In a nutshell, they will fall off the plant and drop to the ground. The good news is that with the right tools, they can easily be controlled down under. The right tools, such as beneficial insects or predatory mites, like Stratiolaelaps scimitus. Not all thrips species, mind you, do this, but the majority of those that growers will be concerned with do. Some common species are flower thrips, echinothrips, greenhouse thrips, onion thrips, and, by far, the most prevalent, the western flower thrips. Cuban laurel thrips is another species of interest to growers.

Signs of Thrips Pests Infestation

Two Thrips

Look out for silvery or distorted foliage, aborted fruits and vegetables, and tiny black fecal specks. Recognizing these early signs allows prompt intervention, preventing broader infestation.

Growers can use a considerable variety of tools. Yellow sticky traps are one such tool. And if you’re using biological control agents to treat for or prevent other pests, which may be captured in yellow traps, then blue sticky traps are also very good at trapping thrips

A plant distorted because of Thrips

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