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Whiteflies are sucking insects as adults and nymphs. Their presence detracts from plants’ value, and high numbers can reduce plant growth or vegetable yields. Silverleaf whiteflies can cause leaf spotting, white stem and bract deformation on poinsettia. Honeydew from whiteflies makes leaves and fruits sticky and is a substrate for black sooty fungus. Whiteflies can transmit many plant viruses affecting vegetable and ornamental plants.

The developmental stages are egg, nymph, (three instars), pupa, and adult. Greenhouse whiteflies develop from egg to adult in 21 to 26 days (81?F, 27?C) and silverleaf whiteflies in 16 days (86?F, 30?C) to 31 days (68?F, 20?C). All stages normally occur on undersides of leaves. Infestations are localized at first, spreading to all areas later.

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 use.

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.

Judo™ – Greenhouse and Nursery Miticide/Insecticide
Apply 2 to 4 fluid ounces per 100 gallons to developing whitefly infestations. Do not apply Judo more than 4 times per season.

Azatin® XL – Insect Growth Regulator
Apply 10 to 16 fluid ounces per 100 gallons to target whitefly nymphs. Tank mix with Decathlon 20WP to target both nymphs and adults. 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 whitefly adults. Tank mix with Azatin XL insect growth regulator to target both adults and nymphs. Repeat at 5 to 7 day intervals.

Triact® 70 – Clarified Hydrophobic Extract of Neem Oil
Mix 1–2 gallons per 100 gallons and apply as a foliar spray. Repeat applications at 7–14 day intervals as required.