Bean, dry-Thrips

Includes Thrips spp. and Frankliniella spp.

Pest description, crop damage and life history

See:

Pest monitoring Treatment is usually not necessary on seedlings, because most plants recover from thrips injury. Thrips are also beneficial at this time because of their role as mite predators.

Management-biological control

Minute pirate bugs play a major role in controlling thrips populations.

Management-cultural control

Thrips populations tend to build up on weeds. Cultivating nearby weedy areas before the crop emerges reduces the potential of a thrips problem when the weeds begin to dry out. Cultivating weedy areas after crop emergence increases thrips problems.

Management-chemical control: HOME USE

  • azadirachtin (neem oil)-Some formulations are OMRI-listed.
  • Beauvaria bassiana-OMRI-listed for organic use.
  • carbaryl
  • horticultural oil-Some formulations OMRI-listed for organic use.
  • imidacloprid
  • insecticidal soap-Some formulations OMRI-listed for organic use.
  • kaolin-Applied as a spray to foliage it acts as a repellent to some insect pests. Some formulations are OMRI-listed for organic use.
  • malathion
  • permethrin
  • plant essential oils (garlic, peppermint, rosemary, etc.)- Some formulations are OMRI-listed for organic use.
  • pyrethrins (often combined with other ingredients)-Some formulations are OMRI-listed for organic use.
  • spinosad-Some formulations are OMRI-listed for organic use.

Management-chemical control: COMMERCIAL USE

  • acephate (numerous products) at 0.5 to 1 lb ai/a. PHI 14 days. REI 24 hr. Do not feed treated vines. Do not exceed 2 lb ai/a per year.
  • borate complex (Prev-Am) applied as a 0.4% to 0.8% solution. Spray to complete coverage. PHI 12 hr. REI 12 hr. Retreatment interval 4 days. OMRI-listed for organic use.
  • carbaryl (Sevin) at 1 lb ai/a. PHI 3 days for harvest of succulents, 21 days for harvest of dried, 14 days for forage, and 21 days for hay. REI 12 hr. Do not exceed 6 lb ai/a per crop. Toxic in aquatic habitats. Do not apply carbaryl dust to blooming weeds because of severe hazard to pollinating bees. Latex-based formulations, such as Sevin XLR Plus, are less hazardous to bees.
  • chlorantraniliprole/lambda-cyhalothrin (Voliam Xpress) at 0.059 to 0.088 lb ai/a. PHI 21 days. REI 24 hr. Minimum of 5 days between applications. Do not exceed a total of 31.0 fl oz of Voliam Xpress or 0.12 lb ai of products containing lambda-cyhalothrin or 0.2 lb ai of chlorantraniliprole per acre per growing season. Do not graze livestock or harvest vines for forage or hay.
  • gamma-cyhalothrin (Proaxis) at 0.01 to 0.015 lb/a. PHI 21 days. REI 24 hr. Do not apply within 25 ft of an aquatic habitat, 150 ft if applied by air. Do not graze. Do not exceed 0.06 lb ai/a per season.
  • lambda-cyhalothrin (Warrior II) at 0.02 to 0.03 lb ai/a. PHI 21 days. REI 24 hr. Do not graze or feed to livestock. Do not exceed 0.12 lb ai/a per year. Toxic to fish. Do not apply within 25 ft of an aquatic habitat, 150 ft if applied by air.
  • malathion (numerous products) at 1 to 1.75 lb ai/a. PHI 1 day. REI 12 hr.
  • methomyl (Lannate) at 0.45 to 0.9 lb ai/a. PHI 14 days for harvest, feeding vines, and hay. REI 48 hr. Do not exceed 4.5 lb ai/a per year.
  • phorate (Thimet)-Do not exceed 1.5 lb ai/a. PHI 60 days. REI 48 hr, or 72 hr if annual rainfall is less than 25 inches. At planting time only. Do not graze or feed to livestock. Toxic to fish and wildlife.
  • spinetoram (Radiant SC) at 0.039 to 0.0625 lb ai/a. PHI 28 days. REI 4 hr. Retreatment interval 4 days. Do not exceed six applications or 0.094 lb ai/a per season. Follow resistance management procedures on the label.
  • spinosad (Success) at 0.07 to 0.09 lb ai/a. PHI 28 days. REI 4 hr. Treat eggs at hatch and small larvae. Do not exceed 0.19 lb ai/a per year. Do not feed forage or hay to livestock. Spinosad takes several days to achieve full effect. Monitor fields and pest populations carefully. Multiple applications may be necessary. Some formulations are OMRI-listed for organic use.