1. Insect
  2. Agronomic Crops
  3. Hop Pests

Hop-Spider mite

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Image related to Hop-Spider mite
Tetranychus unknown
© Ken Gray Insect Image Collection

Twospotted spider mite (Tetranychus urticae)

Pest description and crop damage Adults are small, eight-legged, spider-like arthropods. They are pale green to yellowish to reddish, often with a dark spot on each side of the body. They suck plant juices from leaves and hop cones.

Management-chemical control

  • abamectin (various formulations) at 0.009 to 0.019 lb ai/A. PHI 28 days. REI 12 hr. No more than two applications per season; do not apply second application within 21 days of first. Another compound must be used between abamectin applications. Do not apply more than 0.038 lb ai/A per season. Do not apply in less than 40 gal/A of water. Do not apply by air. Group 6 insecticide.
  • acequinocyl (Kanemite 15 SC) at 0.3 lb ai/A. PHI 7 days. REI 21 hr. Do not apply by air or in less than 100 gals of water per acre. Allow at least 21 days between treatments. Do not make more than two treatments per season. Do not apply more than 0.6 lb ai/A per season. Do not use adjuvants or surfactants. Group 20B insecticide.
  • azadirachtin (various formulations)-See label for rates. PHI 0 days. REI 4 hr. Works best on early larval stages. Applications can be repeated every 7 days or as needed. Some formulations are OMRI-listed for organic use.
  • bifenazate (Acramite 50WS) at 0.38 to 0.75 lb ai/A. PHI 14 days. REI 12 hr. Do not apply in less than 50 gal/A. Do not make more than one application per season. Do not apply by air. REI 12 hr. Group 20D insecticide.
  • bifenthrin (various formulations) at 0.06 to 0.1 lb ai/A. PHI 14 days. REI 12 hr. Do not exceed 0.1 lb ai/A per application or 0.3 lb ai/A per season. Minimum application interval is 21 days. For late-season control by air, apply at least 0.1 lb ai/A in at least 10 gal water/A. Group 3A insecticide.
  • Burkholderia spp. strain A396 (Venerate XC)-See label for rates. PHI 0 days. REI 4 hr. Apply when pest populations are low. Repeat as needed. OMRI-listed for organic use.
  • Chromobacterium subtsugae strain PRAA4-1 (Grandevo)-See label for rates. PHI 0 days. REI 4 hr. Apply when pest populations are low. Repeat as needed. Some formulations are OMRI-listed for organic use.
  • crop/horticultural/stylet oils (various formulations) at 1 to 2 gal per 100 gal water. PHI 0 days. Follow label directions. Local SLN registrations may apply; verify label is in effect before use. Apply as needed. Thorough coverage is essential. Do not apply propargite (Omite) along with, or for 30 days following, an oil spray, or when temperatures exceed 90°F. Some formulations are OMRI-listed for organic use.
  • cyflumetofen (Nealta) at 0.18 lb ai/A in a minimum of 100 gal water per acre. PHI 14 days. Do not make applications at intervals shorter than 14 days. Do not exceed 0.36 lb ai/A per season or two applications.
  • etoxazole (Zeal) at 0.135 to 0.180 lb ai/A. PHI 7 days. REI 12 hr. Do not make more than one application per season. Do not apply more than 4 oz per season. Group 10B insecticide.
  • fenazaquin (Magister SC) at 0.42 to 0.48 lb ai/A. PHI 7 days. REI 12 hr. Apply only once per year. Do not apply more than 0.48 lb ai/A per year. Do not apply by air or through any type of irrigation system. Group 21 insecticide.
  • fenpyroximate (Fujimite 5EC) at 0.105 to 0.158 lb ai/A. PHI 15 days. REI 12 hr. Apply before mite populations exceed 5 per leaf. Use in sufficient volume to ensure adequate coverage. Spray concentrations above 100 ppm are recommended; see label. Do not make more than one application per season. Do not exceed 0.158 lb ai/A per season. Do not apply by air or through any type of irrigation system. Rotate at least two other miticides between fenpyroximate applications. Group 21A insecticide.
  • hexythiazox (Savey 50DF) at 0.125 to 0.187 lb ai/A. PHI Apply up to burr formation. REI 12 hr. Apply only once per season. Savey controls mites through activity on eggs and immature stages. Although it doesn't directly control mite adults, it renders eggs laid by treated female adults nonviable. Complete coverage of leaf surface is essential for effective control. Group 10A insecticide
  • imidacloprid/bifenthrin (Brigadier, Swagger) by ground or air at 0.06 to 0.20 lb ai/A. PHI 28 days. PHI 12 hr. Do not apply more than 0.1 lb ai/A of imidacloprid or more than 0.1 lb ai/A of bifenthrin per application. Do not apply more than 0.30 lb ai/A of any bifenthrin formulation or 0.30 lb ai/A of any imidacloprid formulation per season. Group 4A/3A insecticides.
  • malathion (various formulations) at 0.63 to 1.89 lb ai/A. See label for rates. PHI 7 or 10 days; check label. REI 12 hr. Group 1B insecticide.
  • naled (Dibrom 8E) at 0.94 lb ai/A. PHI 7 days. REI 48 hr. Up to five applications per season at 14-day intervals. A legal pesticide use not found on the pesticide label and not recommended by University of Idaho personnel. Group 1B insecticide.
  • potassium salts of fatty acids (M-pede)-Check label for rates. PHI 0 days. REI 4 hr. Some formulations are OMRI-listed for organic use.
  • propargite (Comite, Comite II, Omite 6E) at 1.5 to 2.5 lb ai/A. See label for rates. PHI 14 days. REI 21 days. Before applying, check current label for re-entry rules, tank-mix limitations, and other restrictions. Do not apply propargite during, with, or following an oil spray. Do not apply more than twice a season. Do not use propargite with nutrient sprays or when daytime temperatures are expected to exceed 95°F. Do not apply in combination with petroleum-based foliar sprays. Application with alkaline materials such as lime sulfur or Bordeaux mixture reduces effectiveness. Group 12C insecticide.
  • spirodiclofen (Envidor 2SC) at 0.28 to 0.386 lb ai/A. PHI 7 days. REI 12 hr. No more than one application per season. No more than 0.386 lb ai/A per season. Minimum application volume 100 gpa by conventional air blast sprayers or 30 gpa using high velocity, low volume sprayers. Group 23 insecticide.
  • spirotetramat (Movento, Ultor) at 0.08 to 0.096 lb ai/A. PHI 7 days. REI 4 hr. Allow at least 14 days between applications. Do not apply more than 0.2 lb ai/A per season. Group 23 insecticide.
  • sulfur (various formulations) at 3 to 45 lb ai/A; see label for rates. REI 24 hr. Do not apply in combination with or within 2 weeks of an oil - or petroleum-based foliar spray, such as emulsifiable concentrates. Sulfur may burn foliage, flowers, or cones if applied when temperatures are high. Use when temperature is above 85º F is not recommended.