How to Get Rid of Thrips

Updated on May 21, 2018
OldRoses profile image

Caren White is a Master Gardener and instructor at Home Gardeners School. She has been associated with Rutgers Gardens for over a decade.

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Thrips are tiny insects that literally suck the life out of your plants, resulting in pale leaves and twisted, discolored plants. One of the best ways to get rid of them is by enlisting the help of their mortal enemies.

Know Your Enemy

Thrips are so tiny that without a magnifying glass, they just look like threads on your plants. But despite their size, they are very destructive. They are classified as sucking insects because they feed on the sap of your plants by sucking it out of the plants. They are a scourge in both the vegetable garden and the flower garden.

In addition to sucking all the sap out of plants, they also transmit disease much like mosquitoes transmit malaria when they suck your blood. This dual danger of loss of sap plus disease transmission is what makes thrips so dangerous,

Thrips overwinter in the soil of your garden in both the adult form and as larvae. When the soil warms in the spring, the adults emerge. The females fly to your plants, make slits in the stems and leaves, and lay up to 80 eggs at a time. They do not need to mate to produce eggs. The eggs hatch within a few days or weeks depending on the temperature, and the larvae begin to feed on the plants' sap. Within two weeks, they drop to the soil to pupate into adults.

Because their lifecycle is so short, there can be a dozen or more generations within one growing season.

The Enemy of My Enemy Is My Friend

Beneficial insects are the best defense against thrips. The Amblyseius cucumeris is a predatory mite that you can purchase via mail order to release into your garden where it will eat the larvae and eggs of thrips.

Pirate bugs, lady bugs and lacewings are also available by mail order and all love dining on thrips, as well as other pests that they find in your garden.

Use Insecticidal Soaps

Spraying with insecticidal soaps such as neem oil can be effective in killing thrips by smothering them. Soaps and neem oil coat the insects blocking the pores through which they breathe.

When spraying, make sure that you coat the entire plant. Don't forget the undersides of the leaves and where the leaves attach to the stems, both are places where thrips love to hide!

If You Must Use Insecticides

Insecticidal sprays are effective in killing thrips, but they also kill other insects. Insecticides make no distinctions between "good" bugs and "bad" bugs.

Sprays containing pyrethrum are good choice if you are overwhelmed with thrips and must spray. Pyrethrum is potent but loses its toxicity within a few days, so beneficial insects can safely move back into your garden.

Since pyrethrum is toxic for honey bees, use it early in the morning or at dusk when they are not active. The spray should be dried by the time the honey bees come looking for nectar.

Once you have cleared your garden of thrips using a spray, release predatory insects to prevent the thrips from infesting your plants again. Remember, there are larvae pupating into adults in the soil which will emerge after you have sprayed.

Ruthlessly Cull

Check your garden daily for signs of thrips. Cut off and discard damaged leaves.

If the insects have infested most of the plant, remove the entire plant and discard it. Make sure that you discard your plants in the garbage and not in your compost.

Don't Give Them Anywhere to Hide

Remove all plant waste from your garden, such as onion tops, weeds, and grass where thrips like to hide.

Use dry mulch like wood chips, because thrips don't like it. They prefer green mulches and plant waste which are moist.

A colony of thrips can decimate your garden. Keep them under control using a mixture of beneficial insects, sprays and sanitary practices.

Questions & Answers

  • Is there a plant food to kill thrips ?

    No, there are no "baits" or poisons consumed in the form of food for thrips. Insect baits are customarily used for insects that live in colonies. The idea is rather killing individual insects, the baits are carried back to the nests to be consumed by the entire colony resulting in the deaths of all the insects.

© 2014 Caren White

Comments

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    • OldRoses profile imageAUTHOR

      Caren White 

      4 years ago from Franklin Park, NJ

      Thank goodness that there are also a lot of critters who like to eat the bad guys, Flourish. Thank you for reading and commenting.

    • FlourishAnyway profile image

      FlourishAnyway 

      4 years ago from USA

      I've never seen or heard of these. So many garden critters competing for our crops!

    • OldRoses profile imageAUTHOR

      Caren White 

      4 years ago from Franklin Park, NJ

      Thanks, Jackie! Glad you found it helpful. Thank you for reading and commenting.

    • Jackie Lynnley profile image

      Jackie Lynnley 

      4 years ago from The Beautiful South

      Helpful advice; thank you.

    • OldRoses profile imageAUTHOR

      Caren White 

      4 years ago from Franklin Park, NJ

      Sorry to hear that your vegetable garden didn't do well. Weather has a big effect on how well a garden does. Temperature (too high, too low) and rainfall (too much, too little) are the two big ones. Thanks for reading and commenting.

    • ologsinquito profile image

      ologsinquito 

      4 years ago from USA

      I've never heard of thrips. Maybe I had them because my one attempt at starting a vegetable garden was dismal. Even the weather didn't cooperate that year.

    • OldRoses profile imageAUTHOR

      Caren White 

      4 years ago from Franklin Park, NJ

      I totally agree! It may be true because we've had a rainier than usual summer. Thanks for reading and commenting.

    • Kaili Bisson profile image

      Kaili Bisson 

      4 years ago from Canada

      So many nasty bugs in the garden this year...must be the weather.

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