Western Flower Thrips Lure

Latin Name:  Frankliniella occidentalis

Lure: Coaster Lure Packet

Lure Active Ingredient: p-Anisaldehyde

Field Life: 30 days

Trap to Use: Blue Sticky Card or Blue Sticky Tape

Monitoring Strategy: Place one baited trap per ha or per greenhouse (lures sold separately). In green houses place traps at the least 20 ft (6 m) from the edges of the field. Place traps 1 ft (30 cm) above the above the raw crop or 6 ft (1.8 m) above the ground for tree crops. Change the sticky trap and lure every 5 weeks.

Cultural and Physical Control: Several cultural practices may reduce injury by Western flower thrips. If control is necessary, use an integrated program of control strategies that combines the use of good cultural practices and conservation of natural enemies with the use of least-toxic insecticides, such as narrow-range oils and avoiding the use of insecticides that may not be effective against thrips and may actually increase the amount of injury occurring during harvest by killing natural enemies. Check with Cooperative Extension or Master Gardener for local information and recommendations.

Distribution: Native to North America, since 1980 it has spread throughout the World.

Hosts: Many herbaceous ornamentals (impatiens, petunia); vegetables (cucurbits, pepper); fruits (grape, strawberry); some shrubs and trees (rose, stone fruit).

Description: Adults: The adult is about 1 mm long. It is yellow with dusky markings on the side of the abdomen. The two sexes look similar, but the male is smaller and always light colored. The abdomen of females ranges from pale yellow to dark brown.

Larvae: Resembles the adult but is smaller.

Eggs: Flat, circular, and translucent laid singly on fruit or foliage.

Life Cycle: Western flower thrips is a year-round pest. The lifecycle of the Western flower thrips varies in length due to temperature, with the adult living from two to five or more weeks, and the nymph stage lasting from five to 20 days. Each female may lay 40 to over 100 eggs in the tissues of the plant, often in the flower, but also in the fruit or foliage.

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