Frankliniella occidentalis and others. Adult thrips have two pairs of narrow wings which are fringed with hairs. Adults emerge continuously throughout the warm months. Adults and immatures may be found in beans at any time during the growing season.
Thrips are most noticeable and of greatest concern on young seedling plants.
Their feeding will make the plants look ragged because they feed on young leaves and buds. Usually the plants will grow away from the problem, just as they outgrow severe ragging resulting from wind damage. Foliage-feeding thrips are effective predators on early season spider mite infestations. Both adult and immature thrips may be found in spider mite colonies feeding on spider mite eggs. Thrips populations tend to build up on weeds.