Why It’s Important To Stay One Step Ahead Of Thrips

Thrips have grating mouthparts that chafe the surface of leaves and flower petals, releasing sap that they then suck up. The grating causes disfiguring damage to the plant tissue
Thrips have grating mouthparts that chafe the surface of leaves and flower petals, releasing sap that they then suck up. The grating causes disfiguring damage to the plant tissue.

Taking the initiative to keep thrips populations below damaging thresholds is always easier said than done. Make no mistake, allowing thrips to get ahead of you is costly in terms of lost crop quality and the added expense of a come-from-behind control program. Shrink is very expensive.

It’s not too late to gain the upper hand on thrips. Fortunately, some spray and drench products are demonstrating good activity. The example of Conserve serves to remind us not to become overly reliant on one insecticide, no matter how many good qualities it has. Resistance-management labeling and good pesticide stewardship dictate that we cannot simply hammer away with pesticides as our silver bullet. Thrips have a well-deserved reputation for developing resistance to pesticides. Practicing a sound rotation strategy is an important part of slowing the progression of pesticide resistance.

First-Choice Products To Control Thrips

The GGSPro team works closely with many growers regarding pest control programs. The resulting feedback provides valuable insight into which products are working well and how best to utilize them. The following products and application strategies are currently among the most successful for thrips control:
• Avid tank-mixed with a neem-based insect growth regulator (IGR), such as Azatin O, AzaGuard or Molt-X, and applied as a foliar application is effective when applied two times, seven days apart. To successfully break the lifecycle, do not wait longer than seven days to make the second application. Avid has a 12-hour re-entry interval (REI) and the neem-based IGRs have a four-hour REI. When tank mixing, the 12-hour REI must be used.
• Kontos drench applications show very good results, though they are slow to take full effect (up to three weeks). They provide up to four weeks or more of control. Foliar spray applications have given variable results and are not recommended for thrips control. Geraniums, cordyline, dracaena palm, fern, hoya, phlox, schefflera, and verbena are among crops damaged by Kontos. Kontos has a zero-hour REI when applied as a drench and label conditions are met.
• Mainspring can be used as a foliar spray or a drench. Foliar sprays stop feeding quickly but may take several days for death to occur. Drench applications may require up to two weeks to take full effect and are unlikely to control thrips in flowers. Mainspring has a four-hour REI and a zero-hour REI as a drench, if label conditions are met.
• Mesurol 75 WP is recommended early in the crop as it may leave a residue and damage certain open blooms. Maximum application is two times at 10 days apart. It has a 24-hour REI.
• Overture 35 WSP is a slower-acting insecticide, taking up to seven days to see significant reductions in adult thrips populations from a foliar application. It has excellent plant and bloom safety. Growers often use this product after faster-acting options have reduced the population. Overture 35 WSP is for greenhouse use only and has a 12-hour REI.
• Pylon & Pylon TR foliar applications are typically made two times, seven days apart, before rotating. Certain fruiting vegetables are on the label. Pylon TR is a total-release aerosol that treats 3,000 square feet.Both formulations are for greenhouse use only and each has a 12-hour REI.

Thrips have a well-deserved reputation for developing resistance to pesticides. Here, thrips-feeding scars on can be seen on gerbera daisy
Thrips have a well-deserved reputation for developing resistance to pesticides. Here, thrips-feeding scars on can be seen on gerbera daisy.

Second-Tier Products (Used in Rotation with Primary Control Products)

• BotaniGard can be tank-mixed as a foliar spray with a neem-based IGR, such as Azatin O, AzaGuard, or Molt-X. Apply it three times at three-to-four days apart, including the neem-based IGR in first and third treatments. BotaniGard has a four-hour REI.
• Certain neonicotinoid insecticides, such as Flagship, Safari, and TriStar have shown effectiveness against thrips. This mode of action is already heavily used for a variety of other greenhouse pests, so we generally do not recommend these products for resistance management reasons.

It is always recommended to trial pesticides on small quantities of plants to evaluate for phytotoxicity before making large-scale applications. Products other than those mentioned may also be safe and effective. Always read and follow all label instructions. Please note, some products may not be registered for use in all states.

6 Questions You Must Answer To Reduce Thrips Damage

Before you detect your first scarred bloom, deformed leaf, or virus outbreak, take a step back and draw on your experiences with thrips control. You should be asking yourself these questions:
1. On which crops do thrips show up first every year?
2. Did I segregate incoming plant shipments to evaluate them for insect and disease presence?
3. What do the early stages of thrips look like, and am I scouting weekly?
4. What are my weekly sticky-card counts telling me about the population trends?
5. Do I understand the thrips life cycle well enough to make timely pesticide decisions?
6. Am I using every tool, including cultural and nutritional monitoring, to reduce thrips reproduction?

Topics: , ,

Leave a Reply

One comment on “Why It’s Important To Stay One Step Ahead Of Thrips

More From Crop Inputs...
Triathlon BA container shot

May 24, 2016

OHP’s Triathlon Biofungicide Now Listed By The Organic Materials Review Institute

Triathlon BA is a broad-spectrum preventative biofungicide that provides control of many foliar and soilborne diseases in ornamentals and herbs.

Read More
Pythium On Chrysanthemum

May 20, 2016

How To Prevent Pythium In Fall Garden Mums

Avoid profit loss in fall garden mums due to pythium root rot with good drainage and integrated pest management practices that reduce risk factors.

Read More
Agro-K

May 19, 2016

Agro-K Expands Distribution In New England Through Partnership With Northeast Agricultural Sales

Agro-K, which manufactures conventional and organic foliar plant nutrients, will distribute its full line of foliar fertilizers and soil biological products through NEAG.

Read More
Latest Stories
Triathlon BA container shot

May 24, 2016

OHP’s Triathlon Biofungicide Now Listed By The Organic …

Triathlon BA is a broad-spectrum preventative biofungicide that provides control of many foliar and soilborne diseases in ornamentals and herbs.

Read More
Two-spotted spider mites, adults and eggs

May 11, 2016

SePRO Launches Summer Insecticide Management Program Fo…

The program is designed to help growers use SePRO’s insect management tools to prevent plant damage from a variety of pests.

Read More
Small Aphid Colony on Calibrachoa

May 2, 2016

How To Stop Aphids In The Greenhouse

When untreated, aphids damage ornamental crops and act as vectors for disease. Integrated Pest Management combined with vigilant scouting can help you stay ahead of the problem.

Read More
Cicada (Greg Hoover, Penn State)

April 26, 2016

Cicadas Set To Emerge In Several Eastern States This Sp…

While there’s no immediate cause for alarm, experts say the cicada’s egg-laying process can damage woody ornamentals and make them vulnerable to diseases.

Read More
Parisitic Wasp Aphidius colemani

April 25, 2016

Plant Growth Regulator Use Can Affect Biological Pest C…

The use of plant growth regulators may negatively influence the outcome of biological control programs, according to researchers at North Carolina State University.

Read More
Beneficial Insectary Orius insidiosus

April 22, 2016

Beneficial Insectary Increasing Production Of Three Bio…

The company is now producing Orius insidiosus, Dalotia coriaria, and Dicyphus hesperus at its California facility, reducing the transit time of perishable biocontrols between producer and grower.

Read More

April 21, 2016

Michigan State University Offers Tips On Greenhouse Soi…

Improper pH and higher than adequate nutrient levels are among the many reasons for regular soil testing.

Read More
Parasitized aphid mummies, ladybird beetle larvae

April 18, 2016

4 Things You Need To Know About Implementing Biological…

Biocontrols are useful alternatives to traditional pesticides that provide effective pest control in the greenhouse. Here are four ways to get started successfully.

Read More
John Wendorf Bayer Ornamentals

April 14, 2016

Bayer’s New Ornamentals Business Manager Aims To Help G…

John Wendorf, who previously managed BFG Supply’s grower division, says when Bayer launches into the ornamentals market this November, growers will have access to a wealth of resources, including a dedicated team focused on ornamentals growers.

Read More
Emerald Ash Borer

March 22, 2016

Canada Implements New Voluntary Biosecurity Standard Fo…

The voluntary standard is designed to protect the greenhouse, nursery, and floriculture industries from invasive plant pests.

Read More

March 22, 2016

EPA Approves Syngenta’s Mainspring GNL Insecticide For …

Featuring the active ingredient cyantraniliprole, Mainspring GNL provides broad-spectrum control of key pests, such as thrips, whiteflies, aphids, caterpillars, leafminers, and leaf-feeding beetles.

Read More
Black Root Rot on Vinca

March 15, 2016

How To Identify Different Root Rots In The Greenhouse

Root rots can cause similar symptoms on hosts. Here are some tips for scouting in your greenhouse.

Read More
One symptom of Botrytis blight is gray, fuzzy sporulation on foliage and flowers, similar to that shown on the flower of this hibiscus

March 11, 2016

Manage Botrytis With These Cultural And Fungicide Contr…

High relative humidity and low temperatures in the greenhouse open the way for Botrytis to develop on plants. A mix of cultural and fungicide control options will help you manage this common disease effectively.

Read More
Biocontrols and beneficials absolutely can be used in outdoor production, with the use of banker plant systems

March 8, 2016

France-Based InVivo Acquiring Bioline, Syngenta’s Bioco…

Bioline, a subsidiary of Syngenta, specializes in the production and marketing of biological control agents, and in particular macroorganisms active against insect pests in fruits, vegetables, and flowers.

Read More

March 5, 2016

Prevent The Spread Of Disease In Irrigation Water

Water-mold pathogens cause significant crop losses and reduce floriculture crop quality. Take measures in your greenhouse to prevent the spread of diseases like Phytophthora and Pythium.

Read More
Bayer Greenhouse Ribbon Cutting

March 1, 2016

Bayer Opens New Greenhouse Research Facility In West Sa…

The $12 million facility will feature two new high-tech greenhouses that will be used in the development of new solutions in vegetable seeds and biologicals.

Read More

February 20, 2016

Hydrogel Technology Means Growers And Their Customers C…

Water and nutrient management are critical elements for quality plant production in the greenhouse. Maintaining the right amounts of available moisture and fertilizer at all times can be pretty labor intensive, but there are tools available to help you keep these inputs at optimum levels as efficiently as possible. Recently, we visited Evonik Industries’ North Carolina production plant for to see how one of these products — Stockosorb — is made, how it works, and learn the benefits of incorporating these tools in your own operation. Learn more about Evonik Industries’ Stockosorb hydrogel product on the Stockosorb website.  

Read More

February 17, 2016

Why It’s Important To Stay One Step Ahead Of Thri…

Keep thrips populations in check and avoid pesticide resistance by using spray and drench products known for their effectiveness.

Read More
[gravityform id="35" title="false" description="false"]