Thrips

*Thysanoptera*

Content coming soon for this insect guide.

Insect Profile

Beneficial Rating

-3 Pest

Active Months

JanFebMarAprMayJunJulAugSepOctNovDec

US Distribution

NortheastSoutheastMidwestSouthwestWestPacific Northwest

Habitat Preferences

gardensagricultural fieldsgreenhouseslandscapes

Taxonomic Group

Bug

Order

Thysanoptera

Family

Thripidae

Lifecycle

Thrips undergo incomplete metamorphosis (hemimetabolous), developing from egg to adult through two larval (nymph) stages, a prepupal, and a pupal stage. The eggs are laid inside plant tissue and hatch within 3-5 days. The nymph stages last for 1-3 weeks, during which they feed on plant tissue. The pupal stage is a non-feeding, resting stage. The entire life cycle can be as short as 8-15 days in warm weather, allowing for up to 15 generations per year in some regions. Adults live for approximately 45 days.

Overwintering Strategy

Adults overwinter in plant debris, soil, and under bark. Some species may also overwinter in the egg or pupal stage.

Native Range

Varies by species; for example, the Western Flower Thrips (Frankliniella occidentalis) is native to western North America.

Attracted By

yellow flowersblue flowerswhite flowersonionsgladiolusrosesover-fertilized plants

Repelled By

Reflective mulches

Organic Control Methods

Organic control of thrips involves a multi-faceted approach. Sticky traps (yellow or blue) can be used to monitor and trap adult thrips. For active infestations, spraying plants with insecticidal soap is effective; two applications three days apart are recommended. Dormant oil can be sprayed on fruit trees to kill overwintering thrips. Diatomaceous earth can be dusted on the undersides of leaves. Encouraging natural predators such as pirate bugs, lacewings, and ladybugs by planting attractive flowers is a crucial biological control method. Predatory mites, like *Amblyseius cucumeris*, can also be released.

Companion Planting

Attracting beneficial insects that prey on thrips is a key companion planting strategy. Plants that attract pirate bugs, lacewings, and ladybugs can help control thrips populations. Using reflective mulches at the base of plants can also help deter thrips by confusing them.