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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.

Discus™ – Nursery Insecticide
Apply 25 fluid ounces per 100 gallons as a foliar spray; OR apply 3.4 to 5.6 fluid ounces per 1000 ft2 as a spray to the soil surface, followed by irrigation or rainfall to move the active ingredient to the root zone. Use at least 2 gallons of spray volume per 1000 ft2; OR apply .75–1.5 fluid ounces per inch of trunk diameter (at breast height) or per foot of shrub height. Use a minimum of 10 gallons of water per 1000 ft2 as a drench; OR mix 13 fluid ounces (385 ml) in the appropriate amount of water for drenching containers of different sizes (see label)

Marathon® II – Systemic and Translaminar Insecticide
Apply 1.7 fluid ounces (50 ml) per 100 gallons as a foliar spray; OR mix 1.7 fluid ounces in the appropriate amount of water for drenching containers of different sizes (see label); OR apply 0.1–0.2 fluid ounces per inch of trunk diameter (at breast height) or per foot of shrub height. Use a minimum of 10 gallons of water per 1000 ft2 as a drench. Shake well before using.

Marathon® 60WP in WSP – Systemic Insecticide
Mix one 20 gram packet in the appropriate amount of water for drenching containers of different sizes (see label) OR apply one 20 gram packet per 8 to 16 inches of cumulative trunk diameter (at breast height) or per 8 to 16 feet of cumulative shrub height. Use a minimum of 10 gallons of water per 1000 ft2 as a drench.

Marathon® 1% G – Systemic Insecticide
Marathon® 1% Granular systemic insecticide is applied topically to the growing media or incorporated prior to planting.
See label for application rates for different container sizes; OR Apply 15 ounces per 1000 ft2.

Azatin® XL – Insect Growth Regulator
Apply 12 to 16 fluid ounces per 100 gallons to target thrips larvae. Tank mix with Decathlon 20 WP to target adults and larvae. The pH of the spray solution should be maintained between 3 and 7. For best results use a spray adjuvant. Repeat applications at 5 to 7 day intervals.

Decathlon™ 20 WP – Synthetic Pyrethroid
Apply 1.9 ounces (54 grams) per 100 gallons to target adults. Tank mix with Azatin XL insect growth regulator to target both larvae and adults. Repeat at 5 to 7 day intervals.