Hop-Garden symphylan

Scutigerella immaculata

Pest description and crop damage A pest in western Oregon. Small, white-bodied, centipede-like animals. Adults have 12 pairs of legs, rapidly vibrating antenna, and spinnerets on the posterior of the body. They feed on roots and above-ground plant parts in contact with soil.

Management-chemical control

  • ethoprop (Mocap EC) at 3 lb ai/a on baby hops (nonproducing) or producing hops. REI 72 hr. Group 1B insecticide.
    • Baby hops, post-plant, pre-emergence: apply as a broadcast application immediately incorporated into the top 2 to 4 inches of soil using a disc or rotary cultivator, or as a broadcast or band application followed by 1 to 2 inches of overhead irrigation. If applied by band, apply in band at least 2 feet wide over the row.
    • Baby hops, pre-plant: apply as a broadcast application and immediately incorporate into the top 2 to 4 inches of soil using a disc or rotary cultivator.
    • Producing hops: apply in the spring after pruning, but before stringing, or post-harvest as a broadcast application immediately incorporated into the top 2 to 4 inches of soil using a disc or rotary cultivator, or as a broadcast or band application followed by 1 to 2 inches of overhead irrigation. If applied by band, apply in band at least 2 feet wide over the row. PHI 90 days. Make only one application per year. Do not apply more than 3.0 lb ai/a per year. Do not apply to saturated soils which increases runoff or to dry soils which decreases effectiveness.
  • pyrethrins/azadirachtin (Azera) at 0.013 to 0.0044 lb ai/a azadirachtin/0.014 to 0.048 lb ai/a pyrethrins. PHI 0 days. REI 12 hr. Apply when pest populations first appear. Reapply every 5-7 days as needed up to 10 times per season. Do not apply more than 0.050 lb ai/a pyrethrins per season. Some formulations are OMRI-listed for organic use. Group 3A insecticide.
  • thiamethoxam (Platinum) at 0.125 lb ai/a. PHI 65 days. REI 12 hr. Do not exceed 0.125 lb ai/a per season. Apply (1) to the soil as a band on each side of the hop row, (2) by drip irrigation into the root zone, or (3) as a hill drench. Incorporate band and hill drench applications with irrigation within 24 hr. Group 4A insecticide.

See also: