Insect Control

Cucumber & Melon - General Cucumber & Melon Disease Control Cucumber & Melon Weed Control

Caution: Insecticides should not be applied when bees are active in the field. Avoid products with high or moderate bee toxicity during bloom. If application of an insecticide is necessary while the crop is blooming, select products with low bee toxicity or with short residual period; apply in the evening after the bees have left the field. See Protecting Honeybees and Native Pollinators in the Insect Management section for more suggestions on how to avoid harmful effects on pollinators.

Aphids, Green Peach (Myzus persicae) and Melon (Aphis gossypii)

Aphids found in cucurbits include green peach aphid and melon aphid. See the Pepper insect control section for more information on green peach aphids. The melon aphid has a wide host range; vegetable crops attacked include cucurbits, asparagus, pepper, eggplant, and okra. Among cucurbits, it is more serious on cucumber, muskmelon, and watermelon than in squash and pumpkins. Varieties differ in susceptibility. Melon aphids overwinter in the north on woody plants, including catalpa and rose of Sharon; more southerly (and in high tunnels with winter production), adults survive on cold tolerant plants, including spinach and dock. The life cycle is similar to that of the green peach aphid; winged females colonize crops in early summer, and wingless females produce live young for about 15 days (70–80 offspring per female), resulting in multiple generations.

The time from birth to reproductive adult can be 1 week. Wingless females are 1–2 mm long. Color varies from light green mottled with dark green (most common) to white, yellowish, or dark green. The cornicles at the tip of the abdomen are always black, a key diagnostic feature. Melon aphid outbreaks are more common in hot, dry weather.

Infestations occur on the undersides of leaves where aphids extract plant sap with their piecing-sucking mouthparts. Feeding causes yellowing, puckering, leaf curling, and leaf death at high numbers, along with shiny honeydew deposits and the buildup of sooty mold. Viruses transmitted by melon aphids include cucumber mosaic virus, watermelon mosaic virus, and zucchini yellow mosaic virus. Because transmission occurs within 15 seconds of feeding, insecticides may not prevent initial virus infection but may reduce its spread in the crop. Oils may reduce virus transmission; test oils for phytotoxicity before applying to an entire crop.

Using reflective mulch or row covers may prevent early infestation and virus transmission. Reflective mulch confuses aphid orientation and reduces their ability to locate and infest plants. Direct-seeding is recommended in reflective mulch for maximum effectiveness. When using row cover, apply immediately after setting transplants or seeding, and be sure transplants were not infested while in the greenhouse. Cultivars differ in susceptibility to aphid buildup and to viruses; plant resistant varieties, if available. Separate early and late plantings.

Scout for aphids beginning in mid-June by searching the undersides of leaves on runners. Treatment may be needed if 20% of runners or more have live aphids. Good coverage of the undersides of leaves is needed with materials that require direct contact with the pests; translaminar products help to reach aphid feeding sites. Use selective insecticides for other pests to conserve natural enemies.

IRAC Group 1:

  • dimethoate (Dimethoate 4EC): 0.5 to 1 pt/A watermelon, 1 pt/A other melons; PHI 3d, REI 48h, Bee: H, Group 1B. Not for cucumber.
  • malathion (Malathion 57 EC): 1.5 pt/A; PHI 1d, REI 24h cucumber, 12h melons, Bee: H, Group 1B. Do not apply unless plants are dry.
  • methomyl (Lannate* LV): 1.5 to 3 pt/A; PHI 1d for 1.5 pt/A, 3d for over 1.5 pt/A, REI 48h, Bee: H, Group 1A. Melon aphid only.
  • oxamyl (Vydate* L): 2 to 4 pt/A foliar; PHI 1d, REI 48h, Bee: H, Group 1A.

IRAC Group 3:

  • alpha-cypermethrin (Fastac* CS): 3.4 to 3.8 oz/A; PHI 1d, REI 12h, Bee: H. See resistance statement on label. Aphid control may be variable depending on species present and host-plant relationships. Aids in control.
  • bifenthrin (Brigade* 2EC): 2.6 to 6.4 oz/A; PHI 3d, REI 12h, Bee: H.
  • gamma-cyhalothrin (Declare*): 1.54 oz/A; PHI 1d, REI 48h, Bee: H. See resistance statement on label.
  • lambda-cyhalothrin (Warrior* II): 1.92 oz/A; PHI 1d, REI 24h, Bee: H. See resistance statement on label. 
  • pyrethrin (PyGanic EC5.0OG): 4.5 to 15.61 oz/A, or 0.25 to 0.50 oz/gal and 3 gal/1000 sq ft in greenhouse for backpack sprayers; PHI 0d, REI 12h, Bee: M.

IRAC Group 4:

  • acetamiprid (Assail 30SG): 2.5 to 4 oz/A; PHI 0d, REI 12h, Bee: M, Group 4A.
  • dinotefuran (Safari 20SG): 3.5 to 7 oz/100 gal, 7 to 14 oz/A, 0.16 to 0.32 oz/1,000 sq ft; REI 12h, Bee: H, Group 4A. Cucumber and melon transplants only, while in greenhouse. Not for field use.
  • dinotefuran (Venom): 1 to 4 oz/A foliar, 5 to 7.5 oz/A soil; PHI 1d foliar, 21d soil, REI 12h, Bee: H, Group 4A. Do not apply to vegetables grown for seed. Suppression only.
  • flupyradifurone (Sivanto): 10.5 to 14 oz/A foliar green peach aphid, 7 to 14 oz/A foliar other aphids, 21 to 28 oz/A soil, 0.34 oz/10,000 plants on seedling transplants in the greenhouse (tray drench); PHI 1d foliar, 21d soil/greenhouse, REI 4h, Bee: L, Group 4D.
  • imidacloprid (Admire Pro): 7 to 10.5 oz/A soil, 0.44 oz/10,000 plants on seedling transplants in greenhouse (tray drench); PHI 21d, REI 12h, Bee: H, Group 4A. Not for foliar applications.
  • thiamethoxam (Actara): 1.5 to 3 oz/A; PHI 0d, REI 12h, Bee: H, Group 4A.
  • thiamethoxam (Platinum 75SG): 1.66 to 3.67 oz/A; PHI 30d, REI 12h, Bee: H, Group 4A. Systemic insecticide used at planting.

IRAC Group 8:

  • sodium tetraborohydrate decahydrate (Prev-AM): 100 oz/100 gal; REI 24h, Bee: L, Group 8D. Do not apply in midday sun or mix with copper.

IRAC Group 9:

  • afidopyropen (Sefina): 3 oz/A; PHI 0d, REI 12h, Bee: L, Group 9D.
  • pymetrozine (Fulfill): 2.75 oz/A; PHI 0d, REI 12h, Bee: L, Group 9B. Selective control of aphids. Translaminar.

IRAC Group 21:

  • tolfenpyrad (Torac): 17 to 21 oz/A; PHI 1d, REI 12h, Bee: H.

IRAC Group 28:

  • cyantraniliprole (Exirel): 13.5 to 20.5 oz/A; PHI 1d, REI 12h, Bee: H. For best performance, use with an effective adjuvant.
  • cyantraniliprole (Verimark): 6.75 to 13.5 oz/A for melon aphid, 10 to 13.5 oz/A for green peach aphid at planting; 6.75 to 10 oz/A for melon aphid, 10 oz/A for green peach aphid chemigation; PHI 1d, REI 4h, Bee: H. Chemigation allowed for first half of crop cycle. 
  • cyclaniliprole (Harvanta 50SL): 10.9 to 16.4 oz/A; PHI 1d, REI 4h, Bee: H. For best results, use with an effective adjuvant. Melon aphid only.

IRAC Group 29:

  • flonicamid (Beleaf 50SG): 2 to 2.8 oz/A; 2.8 to 4.28 oz/A or 0.065 to 0.1 oz/1000 sq ft for greenhouse cucumbers; PHI 0d, REI 12h, Bee: L.

IRAC Group UN:

  • azadirachtin (Azatin OOG): 4 to 16 oz/A foliar or drench, 4 to 16 oz/100 gal in greenhouses; PHI 0d, REI 4h, Bee: L. When using lower rates, combine with adjuvant for improved spray coverage and translaminar uptake.
  • Chromobacterium subtsugae strain PRAA4-1 (GrandevoOG): 2 to 3 lb/A; PHI 0d, REI 4h, Bee: M.
  • insecticidal soap (M-PedeOG): 1.25 to 2.5 oz/gal water; PHI 0d, REI 12h, Bee: L. Apply with a labeled companion insecticide for green peach aphids. For other aphids, use of a companion insecticide is recommended for enhanced and residual control. Do not mix with sulfur. 
  • mineral oil (SuffOil-XOG): 1 to 2 gal/100 gal water; PHI 0d, REI 4h, Bee: L. Apply as needed.

Cucumber Beetle, Striped (Acalymma vittatum) and Spotted (Diabrotica undecimpunctata)

The striped cucumber beetle is a key pest of all cucurbit crops in New England, one that requires cultural and often chemical controls to prevent direct feeding damage and transmission of bacterial wilt. Adult beetles are 7 mm long, are yellow with 3 black stripes that reach the end of the forewings, and have a yellow thorax and black head. Adults overwinter primarily in field edges near last year's crop, with a small proportion remaining in the field. With the onset of warm days (> 50°F), beetles feed on pollen in early-blooming wild plants. High tunnel and greenhouse cucumbers draw beetles first, followed by early field crops. After mating, eggs are laid in soil at the base of the stem, and larvae feed on roots. After pupation in the soil, 'summer adults' emerge, generally in late July and August. Summer adults feed until early fall when they move to overwintering sites. Some may produce a second generation, which emerges in the fall. There is one generation per year in northern New England and a partial second generation in southern New England.

Beetles can colonize a field very rapidly. Adults cause direct feeding damage to cotyledons (often as gouges on the underside), leaves (ragged holes), and the base of the stem (wounds and scars). Wounds on the stem allow entry of soil-borne pathogens. Once flowering begins, beetles congregate in flowers. Adults may feed directly on fruit in high numbers, causing pits and scars. Larval root feeding, hidden but important, reduces plant vigor and yield. The striped cucumber beetle also vectors Erwinia tracheiphila, the causal agent of bacterial wilt. The pathogen overwinters in the beetle gut and is transmitted through fecal material deposited in feeding wounds. The bacteria then invade the vascular system of the plant. Non-infected beetles can become infected by feeding on infected plants. Cucumber and muskmelon are highly susceptible to wilt; watermelon is not. Seedlings at the cotyledon and 1- to 3-leaf stage are more susceptible to infection with bacterial wilt than older plants. Thus, keeping beetle numbers low before the 5-leaf stage is especially important.

Use crop rotation, planting spring crops as far away as possible from last year’s fields and overwintering areas. Exclude beetles using row covers supported by hoops to prevent abrasion; remove at flowering to allow for pollination. Use transplants so that plants reach at least the 3- to 4-leaf stage before beetles arrive. Some repellents or systemic insecticides may be applied to transplants outside the greenhouse before setting in the field, and some may be applied through drip irrigation. See the Pumpkin, Squash, and Gourds insect control section for information on using trap crops to protect a main crop of cucumbers and melons from beetle damage.

Scout twice per week from emergence to the 3-leaf stage, then weekly. Count beetles per plant and note damage to leaves and stems. The economic threshold depends on the crop. To prevent bacterial wilt in highly susceptible crops such as cucumber, muskmelons, summer squash, and zucchini, treat when there is 1 beetle for every 2 plants. Less wilt-susceptible crops (butternut, watermelon, most pumpkins) will tolerate 1 or 2 beetles per plant without yield losses. Spray within 24 hours after the threshold is reached. Timely and effective early control will prevent the need for sprays during flowering when bees are active in the crop. There are minimal options for bee-friendly insecticides to use during flowering; if sprays are needed, apply in the evening after bees have stopped foraging. 

Spotted cucumber beetle does not overwinter here but disperses from more southern areas, reaching New England in mid- to late summer. Also known as southern corn rootworm, it feeds on a very wide range of crops and weeds and is often found in flowers. Adults are yellowish green with 12 black spots and a black head. Immature stages are in the soil. This pest rarely builds up to damaging levels in New England.

IRAC Group 1:

  • carbaryl (Sevin XLR Plus): 1 qt/A; PHI 3d, REI 12h, Bee: H, Group 1A. Do not apply to crops or weeds in bloom.
  • malathion (Malathion 57 EC): 2 pt/A watermelon, 1.6 pt/A other melons; PHI 1d, REI 12h, Bee: H, Group 1B. Melons only.
  • methomyl (Lannate* LV): 1.5 to 3 pt/A; PHI 1d for 1.5 pt/A, 3d for over 1.5 pt/A, REI 48h, Bee: H, Group 1A.

IRAC Group 3:

  • alpha-cypermethrin (Fastac* CS): 3 to 3.8 oz/A; PHI 1d, REI 12h, Bee: H. Adults only.
  • beta-cyfluthrin (Baythroid* XL): 2.4 to 2.8 oz/A; PHI 0d, REI 12h, Bee: H.
  • bifenthrin (Brigade* 2 EC): 2.6 to 6.4 oz/A; PHI 3d, REI 12h, Bee: H.
  • deltamethrin (Delta Gold*): 1.5 to 2.4 oz/A; PHI 3d, REI 12h, Bee: H.
  • esfenvalerate (Asana* XL): 5.8 to 9.6 oz/A; PHI 3d, REI 12h, Bee: H. Adults only.
  • fenpropathrin (Danitol* 2.4EC): 10.66 to 16 oz/A; PHI 7d, REI 24h, Bee: H. May be combined with Belay (see label for rates and increased PHI). 
  • gamma-cyhalothrin (Declare*): 1.02 to 1.54 oz/A; PHI 1d, REI 48h, Bee: H. Adults only.
  • lambda-cyhalothrin (Warrior* II): 1.28 to 1.92 oz/A; PHI 1d, REI 24h, Bee: H. Adults only.
  • permethrin (Pounce* 25WP): 6.4 to 12.8 oz/A; PHI 0d, REI 12h, Bee: H. Adults only.
  • pyrethrin (PyGanic EC5.0OG): 4.5 to 15.61 oz/A, or 0.25 to 0.5 oz/gal and 3 gal/1000 sq ft in greenhouse for backpack sprayers; PHI 0d, REI 12h, Bee: M.
  • zeta-cypermethrin (Mustang* Maxx): 2.8 to 4 oz/A; PHI 1d, REI 12h, Bee: H. Adults only. 

IRAC Group 4:

  • acetamiprid (Assail 30SG): 2.5 to 5.3 oz/A; PHI 0d, REI 12h, Bee: H, Group 4A.
  • dinotefuran (Venom): 1 to 4 oz/A foliar; PHI 1d, REI 12h, Bee: H, Group 4A. Do not apply to vegetables grown for seed.
  • imidacloprid (Admire Pro): 7 to 10.5 oz/A; PHI 21d, REI 12h, Bee: H, Group 4A. Soil applications only.
  • thiamethoxam (Actara): 3 to 5.5 oz/A; PHI 0d, REI 12h, Bee: H, Group 4A. Suppression only.
  • thiamethoxam (Platinum 75SG): 1.66 to 3.67 oz/A; PHI 30d, REI 12h, Bee: H, Group 4A. Systemic insecticide used at planting. Suppression only.

IRAC Group 8:

  • cryolite (Prokil Cryolite): 8 to 16 lb/A; PHI 14d, REI 12h, Bee: L, Group 8C. Melons only.

IRAC Group 28:

  • cyclaniliprole (Harvanta 50SL): 10.9 to 16.4 oz/A; PHI 1d, REI 4h, Bee: H. Striped cucumber beetle only.

IRAC Group UN:

  • kaolin (Surround WPOG): 25 to 50 lb/A, 0.25 to 0.5 lb/gal; PHI 0d, REI 4h, Bee: L. Suppression only. Supplemental controls may be needed for complete control.

Cutworms

See the Pepper and Tomato (Outdoor) insect control sections for information on black and variegated cutworms.

IRAC Group 1:

  • methomyl (Lannate* LV): 1.5 pt/A; PHI 1d, REI 48h, Bee: H, Group 1A. For variegated cutworm.

IRAC Group 3:

  • alpha-cypermethrin (Fastac* CS): 1.4 to 3.8 oz/A; PHI 1d, REI 12h, Bee: H.
  • beta-cyfluthrin (Baythroid* XL): 0.8 to 1.6 oz/A; PHI 0d, REI 12h, Bee: H.
  • bifenthrin (Brigade* 2EC): 2.6 to 6.4 oz/A; PHI 3d, REI 12h, Bee: H.
  • deltamethrin (Delta Gold*): 1 to 2.4 oz/A; PHI 3d, REI 12h, Bee: H.
  • esfenvalerate (Asana* XL): 5.8 to 9.6 oz/A; PHI 3d, REI 12h, Bee: H. Seedling spray only.
  • gamma-cyhalothrin (Declare*): 1.02 to 1.54 oz/A; PHI 1d, REI 48h, Bee: H.
  • lambda-cyhalothrin (Warrior* II): 1.28 to 1.92 oz/A; PHI 1d, REI 24h, Bee: H.
  • permethrin (Pounce* 25WP): 6.4 to 12.8 oz/A; PHI 0d, REI 12h, Bee: H.
  • zeta-cypermethrin (Mustang* Maxx): 1.28 to 4 oz/A; PHI 1d, REI 12h, Bee: H.

IRAC Group 5:

  • spinosad (SeduceOG): 20 to 44 lb/A, 0.5 to1 lb/1000 sq ft.; PHI 1d cucumber, 3d melons, REI 4h, Bee: M. Spread bait on soil around plants. 

IRAC Group 11:

  • Bacillus thuringiensis aizawai (XenTariOG): 0.5 to 2 lb/A; PHI 0d, REI 4h, Bee: L. Must be ingested. 

Seedcorn Maggot (Delia platura)

See the Beans: Snap, Lima, and Dry insect control section for information on seedcorn maggot.

IRAC Group 1:

  • dimethoate (Dimethoate 4EC): 0.5 to 1 pt/A watermelon, 1 pt/A other melons; PHI 3d, REI 48h, Bee: H, Group 1B. Not for cucumbers.

IRAC Group 28:

  • cyantraniliprole (Verimark): 10 to 13.5 oz/A soil at planting except when applied as shank injection; PHI 1d, REI 4h, Bee: H. Apply as in-furrow spray or transplant tray drench no earlier than 72 hours prior to planting in the field, or as transplant water treatment, hill drench, or surface band. 

Squash Bug (Anasa tristis)

See the Pumpkin, Squash, and Gourds insect control section for information on squash bug.

IRAC Group 1:

  • carbaryl (Sevin XLR Plus): 1 qt/A; PHI 3d, REI 12h, Bee: H, Group 1A. Do not apply to crops or weeds in bloom. 

IRAC Group 3:

  • alpha-cypermethrin (Fastac* CS): 3 to 3.8 oz/A; PHI 1d, REI 12h, Bee: H.
  • bifenthrin (Brigade* 2EC): 2.6 to 6.4 oz/A; PHI 3d, REI 12h, Bee: H.
  • esfenvalerate (Asana* XL): 5.8 to 9.6 oz/A; PHI 3d, REI 12h, Bee: H.
  • fenpropathrin (Danitol* 2.4EC): 10.66 to 16 oz/A; PHI 7d, REI 24h, Bee: H. May be combined with Belay (see label for rates and increased PHI). 
  • gamma-cyhalothrin (Declare*): 1.02 to 1.54 oz/A; PHI 1d, REI 48h, Bee: H.
  • lambda-cyhalothrin (Warrior* II): 1.28 to 1.92 oz/A; PHI 1d, REI 24h, Bee: H.
  • permethrin (Pounce* 25WP): 12.8 oz/A; PHI 0d, REI 12h, Bee: H.
  • pyrethrin (PyGanic EC5.0OG): 4.5 to 15.61 oz/A, or 0.25 to 0.50 oz/gal and 3 gal/1000 sq ft in greenhouse for backpack sprayers; PHI 0d, REI 12h, Bee: M.
  • zeta-cypermethrin (Mustang* Maxx): 2.8 to 4 oz/A; PHI 1d, REI 12h, Bee: H.

IRAC Group 4:

  • acetamiprid (Assail 30SG): 5.3 oz/A; PHI 0d, REI 12h, Bee: M, Group 4A. Most effective on newly laid eggs and nymphs.
  • dinotefuran (Venom): 1 to 4 oz/A foliar, 5 to 7.5 oz/A soil; PHI 1d foliar, 21d soil, REI 12h, Bee: H, Group 4A. Do not apply to vegetables grown for seed.
  • flupyradifurone (Sivanto): 10.5 to 14 oz/A; PHI 1d, REI 4h, Bee: L, Group 4D. Foliar applications only.

IRAC Group 30:

  • isocycloseram (Incipio): 2.1 to 4.1 oz/A; PHI 3d, REI 12h, Bee: H. Do not treat plants grown for transplanting. Not for use in greenhouses.

IRAC Group UN:

  • azadirachtin (Azatin OOG): 4 to 16 oz/A foliar or drench, 4 to 16 oz/100 gal in greenhouses; PHI 0d, REI 4h, Bee: L. When using lower rates, combine with adjuvant for improved spray coverage and translaminar uptake.

Two-spotted Spider Mite (Tetranychus urticae)

Also known as red spider mite. Two-spotted spider mite (TSSM) outbreaks are often caused by the use of broad-spectrum insecticides that kill beneficial insects that normally keep populations in check, especially in field production. Watch for white speckling on the upper surface of leaves or webbing on the undersurface around leaf veins. Avoid early-season, broad-spectrum insecticide applications for other pests. Use selective products whenever possible. With most miticides (not bifenazate), use 2 applications, approximately 5–7 days apart, to help control immature mites that were in the egg stage and protected during the first application. TSSM are prone to developing pesticide resistance, so be sure to alternate between IRAC Groups after 2 applications to help prevent or delay resistance. See the Eggplant insect control section for more information on TSSM.

IRAC Group 1:

  • malathion (Malathion 57 EC): 1.5 pt/A; PHI 1d, REI 12h, Bee: H, Group 1B. Melons only.

IRAC Group 3: 

  • bifenthrin (Brigade* 2 EC): 5.1 to 6.4 oz/A; PHI 3d, REI 12h, Bee: H.
  • fenpropathrin (Danitol* 2.4EC): 10.66 to 16 oz/A; PHI 7d, REI 24h, Bee: H. 
  • gamma-cyhalothrin (Declare*): 1.54 oz/A; PHI 1d, REI 48h, Bee: H. Suppression only.

IRAC Group 6:

  • abamectin (Agri-Mek* SC): 1.75 to 3.5 oz/A; PHI 7d, REI 12h, Bee: H. 

IRAC Group 8:

  • sodium tetraborohydrate decahydrate (Prev-AM): 50 oz/100 gal; REI 24h, Bee: L, Group 8D. Do not apply in midday sun or mix with copper.

IRAC Group 10:

  • etoxazole (Zeal): 2 to 3 oz/A; PHI 7d, REI 12h, Bee: L, Group 10B. Do not apply more than once per season.

IRAC Group 20:

  • bifenazate (Acramite 50WS): 0.75 to 1 lb/A; PHI 3d, REI 12h, Bee: L, Group 20D.

IRAC Group 21:

  • fenpyroximate (Portal XLO): 2 pt/A; PHI 1d cucumber, 3d melons, REI 12h, Bee: L. A selective contact miticide.

IRAC Group 23:

  • spiromesifen (Oberon 2SC): 8.5 oz/A; PHI 7d, REI 12h, Bee: M. Effective against egg and immature stages.

IRAC Group UN:

  • insecticidal soap (M-PedeOG): 1.25 to 2.5 oz/gal water; PHI 0d, REI 12h, Bee: L. Use of a companion labeled insecticide/miticide is recommended for enhanced and residual control. Do not mix with sulfur. 
  • Metarhizium anisopliae Strain F52 (Met 52 EC): 40 to 80 oz/100 gal drench, 8 to 64 oz/A foliar; PHI 0d, REI 4h, Bee: L.
  • mineral oil (SuffOil-XOG): 1 to 2 gal/100 gal water; PHI 0d, REI 4h, Bee: L. Apply as needed.
  • neem oil (TrilogyOG): 0.5 to 2% solution in 25 to 100 gal water/A; PHI 0d, REI 4h, Bee: M. 

Whiteflies

See the Tomato (Outdoor) insect control section for information on whiteflies.

IRAC Group 3:

  • gamma-cyhalothrin (Declare*): 1.54 oz/A; PHI 1d, REI 48h, Bee: H. See resistance statement on label. Suppression only.
  • pyrethrin (PyGanic EC5.0OG): 4.5 to 15.61 oz/A, or 0.25 to 0.5 oz/gal and 3 gal/1000 sq ft in greenhouse for backpack sprayers; PHI 0d, REI 12h, Bee: M.

IRAC Group 4:

  • dinotefuran (Safari 20SG): 3.5 to 7 oz/100 gal, 7 to 14 oz/A, 0.16 to 0.32 oz/1,000 sq ft; REI 12h, Bee: H, Group 4A. Cucumber and melon transplants only, while in greenhouse. Not for field use.
  • dinotefuran (Venom): 1 to 4 oz/A foliar, 5 to 7.5 oz/A soil; PHI 1d foliar, 21d soil, REI 12h, Bee: H, Group 4A. Do not apply to vegetables grown for seed.
  • flupyradifurone (Sivanto): 10.5 to 14 oz/A foliar, 0.34 oz/10,000 plants on seedling transplants in the greenhouse (tray drench); PHI 1d foliar, 21d greenhouse, REI 4h, Bee: L, Group 4D. For foliar and greenhouse tray drench applications.
  • imidacloprid (Admire Pro): 7 to 10.5 oz/A soil, 0.44 oz/10,000 plants on seedling transplants in greenhouse (tray drench); PHI 21d, REI 12h, Bee: H, Group 4A. Not for foliar applications.
  • thiamethoxam (Actara): 3 to 5.5 oz/A; PHI 0d, REI 12h, Bee: H, Group 4A.
  • thiamethoxam (Platinum 75SG): 1.66 to 3.67 oz/A; PHI 30d, REI 12h, Bee: H, Group 4A. Systemic insecticide used at planting.

IRAC Group 7:

  • pyriproxyfen (Knack): 8 to 10 oz/A; PHI 7d, REI 12h, Bee: L, Group 7C. Apply when whiteflies reach economic threshold. Higher water volumes may provide improved control. Does not control adults. 

IRAC Group 8:

  • sodium tetraborohydrate decahydrate (Prev-AM): 50 oz/100 gal; REI 24h, Bee: L, Group 8D. Do not apply in midday sun or mix with copper.

IRAC Group 9:

  • afidopyropen (Sefina): 14 oz/A; PHI 0d, REI 12h, Bee: L, Group 9D.

IRAC Group 21:

  • fenpyroximate (Portal XLO): 2 pt/A; PHI 1d cucumber, 3d melons, REI 12h, Bee: L. 

IRAC Group 23:

  • spiromesifen (Oberon 2SC): 8.5 oz/A; PHI 7d, REI 12h, Bee: M. Effective against egg and nymphal stages

IRAC Group 28:

  • cyantraniliprole (Exirel): 13.5 to 20.5 oz/A; PHI 1d, REI 12h, Bee: H. For best performance, use with an effective adjuvant.
  • cyantraniliprole (Verimark): 6.75 to 13.5 oz/A at planting, 10 oz/A chemigation; PHI 1d, REI 4h, Bee: H. Allow 1–3 days for control to be translocated into the aerial portions and to fully protect transplants following an at-plant application. Allow 2–5 days following chemigation. Chemigation allowed during first half of crop growing cycle. 

IRAC Group 29:

  • flonicamid (Beleaf 50SG): 2.8 oz/A; 4.28 oz/A or 0.1 oz/1000 sq ft for greenhouse cucumbers; PHI 0d, REI 12h, Bee: L. Suppression of greenhouse whitefly only.

IRAC Group UN:

  • Chenopodium extract (Requiem EC): 2 to 3 qt/A; PHI 0d, REI 4h, Bee: L. Apply before pests reach damaging levels.
  • Chromobacterium subtsugae strain PRAA4-1 (GrandevoOG): 2 to 3 lb/A; PHI 0d, REI 4h, Bee: M.
  • insecticidal soap (M-PedeOG): 1.25 to 2.5 oz/gal water; PHI 0d, REI 12h, Bee: L. Use of a companion labeled insecticide is recommended for enhanced and residual control. Do not mix with sulfur. 
  • Metarhizium anisopliae Strain F52 (Met 52 EC): 40 to 80 oz/100 gal drench, 8 to 64 oz/A foliar; PHI 0d, REI 4h, Bee: L.
  • mineral oil (SuffOil-XOG): 1 to 2 gal/100 gal water; PHI 0d, REI 4h, Bee: L. Apply as needed.

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New England Vegetable Management Guide