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Past Articles Library | Organic Pest Control | Thrips



Thrips, are tiny insects in the order Thysanoptera, that feed by puncturing plant tissue and sucking out the cell contents. Certain thrips species are beneficial predators, but pest species (often in the family Thripidae) are plant feeders that scar leaf, flower, or fruit surfaces or distort plant parts.



Adults are minute, slender insects 1/50 to 1/25 inch (0.5 to 1 mm) long with narrow fringed wings. They are fast moving and can be yellow, brown or black in color. Nymphs are light green or yellow, and similar to the adults, only smaller.



Adults overwinter in sod, debris, or cracks in bark, becoming active in early spring. Females lay eggs in plant tissue; eggs hatch in 3 to 5 days. Nymphs feed for 1 to 3 weeks, then rest in soil or on leaves for 1 to 2 weeks before molting into adults. 5 to 15 generations a year outdoors and year-round generations in greenhouses.




Thrips have been collected from 29 plant orders including: various berries, cotton, day lilies, field crops, forage crops, grass flowers, legumes, peonies, privet hedges, roses, trees, truck crops, vines, and weeds. They seem to prefer grasses and yellow or light-colored blossoms. Roses are most susceptible in June.




Adults and nymphs suck contents of plant cells, leaving a silvery stippling or streaking on leaves. Severe thrip infestations can stunt and distort plants, damage flowers, and scar fruit. Some species can spread tomato spotted wilt virus.




Attract native predators such as lacwings, lady beetles, or minute pirate bugs.


  • Spray dormant oil on fruit trees

  • For onion or western flower thrips, release the predatory mite Amblyseius cucumeris or minute pirate bugs

  • Use sticky bright yellow or blue sticky traps to catch adults

  • Spray insecticical soap or neem oil


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Growing Caladium

Caladiums grow from tubers sold in the spring.

You can buy the tubers and plant your own, but buying a full-grown plant is the easiest way to know what color the leaves will be.

Give your Caladiums high humidity or the leaf margins may turn brown.

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