Critical Updates for the 2017 Mid-Atlantic Commercial Vegetable Production Guide

The Mid-Atlantic Commercial Vegetable Production Guide is currently undergoing some much needed upgrading to improve both the editor and end-user experience.
Critical Updates for the 2017 Mid-Atlantic Commercial Vegetable Production Guide - News

Updated: September 12, 2017

To account for the time needed to make this transition, a critical updates addendum was prepared to supplement and bring up-to-date the 2016 Mid-Atlantic Commercial Vegetable Production Guide. Below are the critical updates that the contributors deemed as important for the 2017 growing season organized by insect, weed and disease management. Please print this supplement and keep it with your 2016 Production Guide.

Critical Updates for the 2017 Mid-Atlantic Vegetable Recommendations Guide

Insect Management Updates (Entomology)

  1. EPA cancelled all registrations of the insecticide flubendiamide (found in the products Belt and Vetica for use in the U.S. due to potential toxicity concerns for certain aquatic organisms.
  2. Label change for the insecticide/miticide abamectin: Agri-Mek SC label contains revised use instructions and restrictions as well as new labeled crops (including dry and succulent beans, soybeans and sweet corn). Be sure to read the label before making an application for use rates and all restrictions including, but not limited to adjuvant requirement that must be followed to avoid illegal residues. NOTE - this is the only labeled formulation of abamectin available for use on dry and succulent beans, soybeans and sweet corn for spider mite control.
  3. Allium leafminer: New serious pest of onions and garlic in the mid-Atlantic region. See more below.

Allium leafminer (Phytomyza gymnostoma) is a new serious pest of onions and garlic in the mid-Atlantic region. This invasive species first confirmed in southeastern Pennsylvania in 2016. Adults appear to be active in the spring (March-May) and fall (October-November). Management includes row covers or insecticides during the time of adult activity. Although efficacy trials have not been conducted, the following insecticides labelled for leafminers that may be effective against allium leafminer. Labeled crops noted with days to harvest (DTH). Crop subgroups with listed crops taken from labels and also found at the IR-4 website. Also see the Penn State Pest Alert and PDA website for more information.

  • Trigard (cyromazine): for leafminers (Not for use in Nassau and Suffolk Counties, NY)
    • Bulb Vegetables crop group (7 DTH)
    • Some of the crops in this group are: garlic, great-headed (elephant) garlic, leek, dry bulb onion, green onion, potato onion, tree onion, Welsh onion, rakkyo, and shallot.
  • Scorpion (dinotefuran): for leafminers and others (Not for use in NY)
    • Onion, bulb and green (subgroups 3-07A and 3-07B) (1 DTH)
    • Bulb onion, includes: Daylily, bulb; Fritillaria, bulb; Garlic, bulb; Garlic, Great- headed, bulb; Garlic, serpent, bulb; Lily, bulb; Onion, bulb; Onion, Chinese, bulb; Onion; pearl Onion; potato, bulb; Shallot, bulb; Cultivars, varieties and/or, hybrids of these
    • Green onion, includes: Chive, fresh leaves; Chive, Chinese, fresh leaves; Elegans hosta; Fritillaria leaves; Kurrat; Leady's leek; Leek; Leek, wild; Onion, Beltsville bunching; Onion, fresh; Onion, green; Onion, macrostem; Onion, tree, tops; Onion, Welsh tops; Shallot, fresh leaves; Cultivars, varieties and/or hybrids of these
  • Radiant SC (spinetoram): for dipteran leafminers and others
    • Bulb Vegetables (Crop Group 3) (1 DTH)
    • Bulb vegetables: bulb onion, garlic, great-headed (elephant) garlic, green onion, leek, shallot, Welsh onion
    • Herbs (Subgroup 19A) (1 DTH) includes: chive, chive (Chinese)
  • Mustang, Mustang Maxx (and OLF) (zeta-cypermethrin): for leafminers (adults)
    • Bulb Vegetables (Allium spp.) (7 day PHI) including: Garlic; Garlic, Great-Headed (elephant); Green Eschalots; Japanese Bunching Onions; Leeks; Onion, Dry Bulb and Green; Onion, Welch; Shallots, Dry Bulb and Green; Spring Onion or Scallions
  • Warrior II (and OLF) (lambda-cyhalothrin): for leafminer species (adults)
    • Onion (bulb) and Garlic (14 DTH)

Specifically For Organic Growers:

  • Aza-Direct (and OLF) (azadirachtin): for leafminers
    • Verify label crops and uses - some variation among products and some may not be organic-compatible
    • Bulb Vegetables (0 DTH) such as: Garlic, Leek, Onion (dry bulb, green and Welch), Shallot
  • Entrust SC (spinosad): organic-compatible, for dipteran leafminers and others
    • Bulb Vegetables (Crop Group 3) (1 DTH)
    • Bulb vegetables: dry bulb onion, garlic, great-headed (elephant) garlic, green onion, leek, shallot, welch onion
    • Herbs (Subgroup 19A) (Insect Suppression) (1 DTH) includes: chive, chive (Chinese)

Products not specifically labeled for Phytomyza gymnostoma (Allium leafminer) but may be effective

  • Agri-Mek SC (or OLF) (abamectin): for Liriomyza leafminers and thrips. Include adjuvant per label
    • Herb Crop Subgroup (Crop Subgroup 19A) (7 DTH) including Chives, Chives (Chinese)
      • Onion, Bulb (Crop Subgroup 3-07A) (30 DTH) Crops in this group are: onion, bulb including daylily, bulb; fritillaria, bulb; garlic, bulb; garlic, great-headed, bulb; garlic, serpent, bulb; lily, bulb; onion, Chinese, bulb; onion, pearl; onion, potato, bulb; shallot, bulb; cultivars, varieties, and/or hybrids of these.
  • Exirel (cyantraniliprole): for Leafminer (Liriomyza spp.) and thrips. Include adjuvant per label
    • Bulb Vegetables, (EPA Crop Group 3-07) (1 DTH) Chive, fresh leaves; Chive, Chinese, fresh leaves; Daylilly, bulb (edible); Elegans hosta (edible); Fritillaria, leaves (edible); Garlic, bulb; Garlic, great headed, bulb; Garlic, serpent, bulb; Kurrat; Lady's leek; Leek; Leek, wild; Lily, bulb; Onion, Beltsville bunching; Onion, bulb; Onion, Chinese, bulb; Onion, fresh; Onion, green; Onion, macrostem; Onion, pearl; Onion, potato, bulb; Onion, tree, tops; Onion, Welsh, tops; Shallot, bulb; Shallot, fresh leaves
  • Assail (acetamiprid): for thrips
    • Onions and other Bulb Vegetables, (EPA Crop Group 3-07) (7 DTH) Chive, fresh leaves; Chive, Chinese, fresh leaves; Daylilly, bulb; Elegans hosta; Fritillaria, leaves and bulbs; Garlic, bulb; Garlic, great headed, bulb; Garlic, serpent, bulb; Kurrat; Lady's leek; Leek; Leek, wild; Lily, bulb; Onion, Beltsville bunching; Onion, bulb; Onion, Chinese, bulb; Onion, fresh; Onion, green; Onion, macrostem; Onion, pearl; Onion, potato, bulb; Onion, tree, tops; Onion, Welsh, tops; Shallot, bulb; Shallot, fresh leaves

Allium leafminer insecticides compiled by Dan Gilrein, Cornell Cooperative Extension of Suffolk County, Riverhead, NY 3/31/2016

Weed Management Updates

Cole Crops, Pepper, and Watermelon

  • Reflex: 24c registrations also include Virginia. See label rates, instructions and restrictions.

Cucumbers

  • Sandea: Pre-harvest interval has been reduced 14 days (24c registration; expires 5/31/2018)

Lettuce

  • Kerb: Label has been expanded to include leaf lettuce as well as head lettuce.

Sweet Corn

  • Recently labeled herbicides include:
    • Acuron: Pre-packaged mixture of Dual, atrazine, Callisto, and bicyclopyrone. Applications can be made pre-plant or preemergence. Broad spectrum control.
    • Acuron Flexi: Similar to Acuron, but without atrazine
    • Armezon Pro: Pre-packaged mixture of Armezon plus Outlook for postemergence applications. Outlook may provide additional residual control for grasses and some small-seeded broadleaf weeds.
    • Verdict: Pre-packaged mixture of Outlook and Sharpen. Applications can be made pre-plant or pre-emergence.

Changes to Labels Affecting Crop Rotations:

  • Reflex has new crop rotation planting restrictions for the following crops:
    • Lima bean: 4 months instead of 10 months
    • Pumpkin: 10 months instead of 18 months
    • Cucumber: 12 months instead of 18 months
    • Transplanted pepper/tomato: 10 months instead of 18 months
    • Direct seeded pepper/tomato: 12 months instead of 18 months
    • Squash: 12 months instead of 18 months
  • Flexstar and Flexstar GT have new crop rotation planting restrictions for the following crops:
    • Lima bean: 4 months instead of 12 months
    • Squash: 12 months instead of 18 months

Disease Management Updates (Pathology)

  • Presidio (fluopicolide, 43) is not labelled for use in potato.
  • SoilGard (Trichoderma virens) and Double Nickel (Bacillus amyloliquefaciens strain D747) are labelled for use on greenhouse transplants.
  • Orondis Opti (oxathiapiprolin + chlorothanonil, U15 + M5) is now labeled for use on multiple crops for fungal leaf spots and downy mildew control.
  • Orondis Ultra (oxathiapiprolin + mandipropamid, U15 + 40) is now labeled for use on multiple crops for downy mildew and Phytophthora blight control
  • Orondis Gold (oxathiapiprolin + mefenoxam, U15 + 4) is now labeled for use on multiple crops for damping-off and Phytophthora blight control.

*See Label for Specific Crops and Use Rates

Authors

Integrated vegetable disease management Plant pathogen diagnosis Disease monitoring and forecasting Sustainable crop production

More by Beth K. Gugino, Ph.D.