Mainspring GNL Insecticide | GreenCast | Syngenta

Product Overview

Mainspring® GNL insecticide for plants, guards greenhouse and nursery crops from key chewing and sucking pests, including thrips, whiteflies, aphids, caterpillars, leafminers, leaf-feeding beetles, soft scales and lacebugs. It offers reliable, extended protection as part of a preventive pest management strategy.

Mainspring GNL Videos



Key Benefits

Mainspring GNL insecticide for plants
  • A neonicotinoid alternative with the novel active ingredient cyantraniliprole, which belongs to a recently added chemistry class (IRAC Group 28) 
  • Controls multiple key pests as a spray or drench while strengthening integrated crop management (ICM) programs 
  • Four-hour REI (restricted-entry interval), no special personal protective equipment required for early entry and registered by the U.S. EPA under its Reduced Risk Program*
  • Provides extended protection through its systemic and translaminar movement to prevent pest populations from building to damaging levels
  • This insecticide for plants is labeled for use in greenhouses, nurseries and residential and commercial landscapes

Key Features

  • Powerful resistance management tool that meets growers’ needs for effective, alternative chemistries
  • Broad-spectrum control that offers application flexibility and compatibility with many biological control agents
  • Short REI is less disruptive to work schedules while offering improved worker safety compared to other registered alternatives
  • Saves time and labor on repeated applications and reduces overall plant damage caused by insect feeding 
  • Convenient, versatile insecticide that can fit into any operation


*A reduced risk pesticide use is defined as one which may reasonably be expected to accomplish one or more of the following; (1) reduces pesticide risks to human health; (2) reduces pesticide risks to non-target organisms; (3) reduces the potential for contamination of valued, environmental resources, or (4) broadens adoption of IPM or makes it more effective. Mainspring GNL qualifies under one or more of the above criteria.

Mainspring GNL calculator screen grab
Mainspring GNL Calculator (Excel)

This calculator can help determine how much Mainspring GNL you will need to protect your crop from pests.




Jim Daugherty
Head Grower
Corso's Perennials

“When applied at label rates, Mainspring GNL is a very effective tool in the battle for insect control. It has an extended period of protection up to 5 to 8 weeks, a short REI and the value of systemic movement. In the past we would see levels rise quickly or flare ups in certain areas of the greenhouse. With the use of Mainspring GNL, we have had a great level of success in preventing these issues. The most valuable features of this product to us is its longevity and systemic qualities. It moves through the plant giving the insects nowhere to hide with a considerably long residual effect.”


Amy Morris
Head Grower
NG Heimos Greenhouse

“We trialed Mainspring® GNL insecticide and found that a drench provided excellent coverage. We were not seeing any caterpillars, thrips, aphids or leafminers. If we want 100% coverage, we drench with Mainspring GNL. With our outdoor mums, we used to have to spray every week just to prevent flare ups of aphids or caterpillars. We’re able to eliminate a lot of that product use. We drenched our poinsettias 8 weeks prior to shipping using the 10 oz. rate and found that it held perfectly. I was very happy with the results of Mainspring GNL.”


Kevin Pennings
Van Vugt Greenhouse

“Mainspring GNL was very effective for controlling whitefly on our poinsettia crops. We appreciate that Mainspring GNL gives you the option to drench and provides at least 6-8 weeks of control; it is a great preventive treatment. In our operation we use a lot of beneficial insects and Mainspring GNL did not have a negative impact on them. I would recommend it to other growers and will continue using it in my greenhouse.”


Marybeth Martin
Head Grower
Michael’s Greenhouses

“All our hanging baskets are treated with Mainspring GNL about three weeks after transplant. This has provided very effective aphid control. We spray weekly with beneficial nematodes for fungus gnats and thrips control and the Mainspring GNL drench works well with this practice. I am so pleased with the efficacy of Mainspring GNL that I plan on using it on our next poinsettia crop in conjunction with biologicals for whitefly control. I appreciate the low restricted-entry interval and the ability to incorporate this chemical into my IPM strategy.”



Whitefly Management

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Mainspring Long-lasting Whitefly Control
Mainspring Compatibility with A. swirskii
Mainspring GNL + A. swirskii for whitefly control
Whitefly Plant Mainspring Gnl
Whitefly Mainspring Gnl
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Long-lasting Whitefly Control

Poinsettias can be very susceptible to whitefly as populations can build quickly in the crop. Mainspring GNL can prevent the pests from establishing and provide long residual control.

Transplanted 8/24/17 in 8-inch containers with Pro-Mix® BX
Treatments applied as a 6 fl. oz. drench
WAT = Weeks After Treatment
2017 – ATOC, Ferguson

Mainspring Compatibility with A. swirskii

Plants infested with 100 whitefly (25/plant) 3X on a weekly interval.

Predatory mites released 3X on a weekly interval (20/plant); with the first release occurring one week after first whitefly exposure and prior to Mainspring GNL (12 floz drench).

Overlapping stages of A. swirskii eggs and mobiles could be found 4 weeks after the last mite release indicating good compatibility with Mainspring GNL drench treatment.

2016 - V. Kumar, G. Kakkar, L. Osborne, UF-Apopka
C. McKenzie, USDA-ARS-USHRL Ft. Pierce

Mainspring GNL + A. swirskii for whitefly control

Mainspring GNL and Mainspring GNL + A. swirskii combination treatment provided excellent control of whitefly lasting for 8 weeks.

2016 - V. Kumar, G. Kakkar, L. Osborne, UF-Apopka
C. McKenzie, USDA-ARS-USHRL Ft. Pierce

Whitefly (Bemisia tabaci Q-Biotype)

Mainspring GNL is an effective solution for controlling whiteflies, both biotypes B and Q. As a drench, it moves through the plant to shield it and stop insects from feeding.

Hibiscus – Untreated (left), Mainspring GNL 8 oz drench (right)

2016 Osborne, UFL - Apopka

Whitefly (Bemisia tabaci Q-Biotype)

Mainspring GNL is an effective solution for controlling whiteflies, both biotypes B and Q. As a drench, it moves through the plant to shield it and stop insects from feeding.

Hibiscus - Untreated (left), Mainspring GNL 8 oz drench (right)

2016 Osborne, UFL - Apopka

Whitefly on hibiscus

Mainspring GNL is effective when applied as either a spray or drench for controlling whitefly.

Hibiscus plants grown in 4-inch containers

Spray treatment: Twice on 14-day interval

Six replicates

Counts made on two leaves per plant

2016 Osborne, UFL- Apopka

In the News

Prevent Whiteflies, Thrips and More
Whitefly and thrips are two of the most challenging pests in ornamental production. There are multiple species of each, some of which can transmit plant viruses. Prevention is critical for controlling these insect pests.  Read more »
Tips from a Top 100 Grower for Effective Thrips Control
Thrips have always been a problem for the growers at Kube-Pak, but alternative, compatible chemistries have allowed them to enhance their control program. Armed with Flagship® and Mainspring GNL insecticides, as well as beneficial insects, they are seeing much better results in the fight against thrips. Read more »
A Cohesive Approach
Whiteflies have become one of the most common pests in the ornamental industry. Prevention is key to a clean greenhouse and a healthy crop. Mainspring GNL allows growers the flexibility to prevent whitefly as part of an integrated crop management system with beneficial insects. Read more »


Powerful Prevention
Powered by a unique active ingredient in a recently added chemistry class, Mainspring® GNL insecticide offers an effective, non-neonicotinoid option for controlling leaf-feeding beetles and other pests. When used preventively, Mainspring GNL keeps pest populations from building to damaging levels and helps reduce additional pest pressure later in the season. Read more »


Download Supporting Mainspring GNL Documents

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Aphids Solutions Guide(PDF)

Learn more about products and recommendations for aphid control.

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Mainspring GNL Insecticide Best Practices Q&A(PDF)

View best practices for using Mainspring GNL insecticide in greenhouses and nurseries.

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Mainspring GNL Insecticide Information Sheet(PDF)

Shield your greenhouse and nursery crops with Mainspring GNL.

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Mainspring GNL Insecticide Sales Tool(PDF)

This infographic explains the key features of Mainspring GNL and how best to use the product.

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Mainspring GNL Insecticide Top Benefits Sell Sheet(PDF)

Top 5 reasons to trust Mainspring GNL to prevent pests

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Nursery Brochure(PDF)

Learn more about our vast portfolio of insecticides, fungicides and herbicides available for use in nurseries.

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Thrips Solution Guide(PDF)

Learn more about controlling thrips in your operation.

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Whitefly Solutions Guide(PDF)

Learn more about preventing whitefly in your operation.


What We’re Talking About


Watch out for European pepper moth

Be on the lookout for moth activity in production, as it could be the infamous European pepper moth (Duponchelia fovealis).  Read more »


Preparing for warm-season pests

While outside temperatures are slowly increasing, so can insect and disease pressure in your operation.  Read more »


Chemical Compatibility with Beneficial Insects

Many Integrated Pest Management (IPM) programs incorporate traditional chemical products and biological control agents (BCAs).  Read more »


Shield Crops From Whitefly And Thrips

Whitefly and thrips are two of the most challenging pests in ornamental production. There are multiple species of each, some of which are known to transmit plant viruses. Prevention is critical to controlling these insect pests and stopping their damage before it affects the value and sale of the crop.  Read more »