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Thrips feed by rasping and sucking plant fluids. Feeding injury distorts and discolors leaves and flowers. Feeding on pollen causes premature senescence. Several species transmit viruses, including tomato spotted wilt virus (TSWV) and impatiens necrotic spot virus (INSV). Western flower thrips prefer to feed in flowers, but will also survive on leaves. They can occur and cause problems on nearly all greenhouse plants.

Thrips develop from egg to adult in 10-15 days (76°-86° F, 25°-30° C) to 57 days (54° F, 12° C). Hot and dry conditions are best for development. The developmental stages are egg, larva (two instars), pseudopupa (two transformation stages, usually off the plant), and adult. In general, any environmental stress that weakens plants makes them more thrips-susceptible (e.g. moisture stress, mildew). Wet conditions retard development.

Marathon® 60 WP G&N in WSP – Systemic Insecticide
For Systemic Insect Control in Ornamental Crops
Rate: 1 x 20 gram packet in appropriate amount of water
Signal Word: Caution REI: 0 - 12 hours (read label)

Marathon® 1% Granular – Systemic Insecticide
For Systemic Insect Control in Ornamental Crops
Rate: Refer to label
Signal Word: Caution REI: 0 - 12 hours (read label)

Marathon is applied topically or as a drench to suppress thrips on stems and foliage. For best control, apply prior to high infestation. Control is in excess of 8 weeks. Monitor watering techniques for 10 days to avoid leaching. Always read the label.

Marathon® II – Translaminar Systemic Insecticide
For Foliar Applications for Insect Control in Greenhouse, Nursery and Interiorscapes
Rate: 50 mL (1.7 oz.) per 100 gallons
Signal Word: Caution REI: 12 hours

Marathon II is for the suppression of thrips and is for foliar applications only. Marathon II full cover spray should commence before intense insect pressure is present. Marathon II is compatible with commonly used pesticides and foliar fertilizers.

The use of a spreader/sticker is recommended. Always read the label and technical bulletins prior to product use.

Azatin® XL – Insect Growth Regulator
For Indoor and Outdoor Use on Ornamentals and Horticultural Crops
Rate: 12 — 16 oz. per 100 gallons (Curative)
Signal Word: Caution REI: 4 hours

Spray applications of Azatin XL insect growth regulator will control pupal and larval stages and repel adults. Tank mix Azatin XL with Decathlon 20 WP synthetic pyrethroid to control pupal, larval and adult stages of thrips is suggested. Repeat applications at 5 to 7 day intervals. Always read the label.
Azatin is a registered trademark of Certis USA.

Decathlon™ 20 WP – Synthetic Pyrethroid
For Broad-Spectrum Control of Crawling and Flying Insect Pests on Ornamentals and Nursery Stock
Rate: 1.9 oz. per 100 gallons
Signal Word: Caution REI: 12 hours

Spray applications of Decathlon 20 WP synthetic pyrethroid will control adult and larval stages of thrips. Tank mix with Azatin XL insect growth regulator to control pupal, larval and adult stages of thrips is suggested. Spreader stickers can enhance activity. Repeat applications at 5 to 7 day intervals. Always read the label.