Marathon II Insecticide

Marathon II Insecticide

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Product Overview

Marathon II is an insecticide that provides effective control and instant knockdown of sucking and piercing insects in greenhouses, nurseries, interior plantscapes, and similar areas. It contains Imidacloprid as its active ingredient which effectively controls insects such as aphids, adelgids, fungus gnat, lacebugs, leafminers, leafhoppers, mealybugs, psyllids, thrips, whiteflies and more on ornamentals, fruit and nut trees, and vegetable plants. This offers up to 12 weeks of systemic activity when applied to the soil surface and is highly translaminar as a foliar spray resulting in quick eradication of pests. It is recommended to apply to the growing part of the plant for better absorption of the active ingredient. This flowable formulation provides efficient control using low rates, making it more economical to use.

Features and Specs

Active Ingredient Imidacloprid 21.4%
Target pests Adelgids, Aphids, Fungus Gnat, Japanese Beetle, Adults Lacebugs, Leafhoppers, Leafminers, Mealybugs, Psyllids, Root Mealybugs, Root Weevils, Royal Palm Bugs, Sawfly Larvae, Soft Scale, Thrips, White Grub Larvae, Whiteflies
For use in Greenhouses, Nurseries, Interior Plantscapes and similar areas on Ornamentals, Fruit and Nut Trees, and Vegetables
Application Foliar spray, broadcast spray or drench.
Rate per 100 gallons - 1.7 fluid ounces
Rate per 1 gallon - 1/10 tsp (.5 mL)
Pet safe Yes, if used as directed on Label
AZ, CO, CT, MA, ME, MD, NJ, NV, NY, RI, VT (Restricted To Licensed Applicators Only)
Special Features Quick knockdown as a spray
Low use rates
Shipping Weight 0.75 lbs
Manufacturer OHP Inc.
UPC 896531002374
EPA Registration 53883-232-59807




Do not apply this while bees are foraging. Do not apply this until flowering is complete and all petals have fallen unless one of the following conditions is met:

  • The application is made to the target site after sunset
  • The application is made to the target site when temperatures are below 55 degrees Fahrenheit
  • The application is made in accordance with a government-initiated public health response
  • The application is made in accordance with an active state-administered apiary registry program where beekeepers are notified no less than 48-hours prior to the time of the planned application so that the bees can be removed, covered or otherwise protected prior to spraying
  • The application is made due to an imminent threat of significant crop loss, and a documented determination consistent with an IPM plan or predetermined economic threshold is met. Every effort should be made to notify beekeepers no less than 48-hours prior to the time of the planned application so that the bees can be removed, covered or otherwise protected prior to spraying.

Non-Agricultural Uses:

Do not apply MARATHON II while bees are foraging. Do not apply MARATHON II to plants that are flowering. Only apply after all flower petals have fallen off.

Do not apply this in a way that will contact workers or other persons, either directly or through drift. Only protected handlers may be in the area during application. For any requirements specific to your State or Tribe, consult the agency responsible for pesticide regulation.


MARATHON II may be used to control insect pests on ornamental and vegetable plants in nurseries and greenhouses and interior plantscapes. Insect protection is achieved because MARATHON II is a systemic product and the active ingredient moves upward into the plant system. For best results MARATHON II should be applied to the growing part of the plant for more absorption of the active ingredient. Nitrogen containing fertilizer may be added to the solution to aid in the uptake of the active ingredient where applicable. MARATHON II may be applied as a foliar spray or by soil applications such as soil injection, drenches, chemigation and broadcast sprays.

Soil applications to plants with woody stems will require applications of MARATHON II before expected pests infestations due to the delay in the uptake of the active ingredient and the time until the product is taken up throughout the plant.

For outdoor ornamentals, do not exceed a total of 1.6 pints (0.4 lb of active ingredient) per acre per year.

Bark Media: The length of protection after treatment with MARATHON II may be shortened if the media has 30% or more bark content.

RESISTANCE: Some insects are known to develop resistance to insecticides after repeated use. As with any insecticide, the use of this product should conform to resistance management strategies established for the use area. Consult your Cooperative Extension Service for resistance management strategies and recommended pest management practices for your area.

Application Equipment For Ornamentals And Vegetable Plants

MARATHON II mixes with water and may be applied with different types of application equipment. After mixing with the correct amount of water, follow the application directions for the selected use pattern.

For applications on hard to wet foliage such as holly, pine, or ivy, the use of a spreader/ sticker is recommended. For application by concentrate or mist type spray equipment, the same amount of product should be used on the area sprayed, as would be used in a dilute application.

MARATHON II is compatible with frequently used fungicides, miticides, liquid fertilizers. Compatibility may be tested in a small jar by using the correct proportion of products if compatibility information is not available.


MARATHON II may be applied alone or as a tank mixture with other chemicals or pesticides registered for application through irrigation systems. The normal dilution ratio is 1:100 to 1:200, depending on the system. Always meter the product into the irrigation water during the first part of the irrigation cycle. The product may be mixed separately prior to injection. Agitation may be necessary if the mixture is allowed to stand more than 24 hours.

Remove scale, pesticide residue and other foreign matter from the tank and entire irrigation system.

Apply MARATHON II only through micro irrigation (individual spaghetti tubes), drip irrigation, overhead irrigation, ebb and flood, or hand-held or motorized calibrated irrigation equipment.

Do not apply this product through any other type of irrigation system. Crop injury or lack of effectiveness can result from nonuniform distribution of treated water.

If you have any questions about calibration, contact your State Extension Service specialist, equipment manufacturers or other experts in this area.

Do not connect an irrigation system (including greenhouse systems) used for pesticide application to a public water system unless the pesticide label-prescribed safety devices for public water systems are in place.

A person knowledgeable of the chemigation system and responsible for its operation, or a person who is under the supervision of the responsible person, shall shut the system down and make necessary adjustments should the need arise.


  • Do not graze treated areas or use clippings for treated areas for feed or forage. Avoid runoff or puddling of irrigation water following application.
  • Do not apply MARATHON II to soils which are water logged or saturated, which will not allow penetration into the root zone of the plants.
  • Do not allow leachate run out for the first 10 days after application, in order to retain the product and facilitate full plant uptake of the active ingredient.
  • For outdoor ornamentals grown in beds or turf, applications of MARATHON II cannot exceed a total of 1.6 pt (0.4 lb of active ingredient) per acre per year.
  • Food Crops: Treated areas may be replanted with any crop specified on an imidacloprid label, or with any crop for which a tolerance exists for the active ingredient.
  • For crops not listed on an imidacloprid label, or for crops for which no tolerances for the active ingredient have been established, a 12 month plant-back interval should be observed.
  • Do not apply this product, by any application method to linden, basswood, or other Tilia species.


MARATHON II may be used on nursery grass in areas such as under or around field or container grown plants, on roadways or other grassy areas in or around nurseries. MARATHON II is not for use on commercial sod farms.

MARATHON II controls soil inhabiting pests of grassy areas of nurseries, such as Northern and Southern masked chafers, Cyclocephala borealis, C. immaculata, and/or C. lurida; Asiatic garden beetle, Maladera castanea; European chafer, Rhizotroqus majalis; Green June beetle, Cotinis nitida; May or June beetle, Phyllophaga spp.; Japanese beetle, Popillia japonica; Oriental beetle, Anomala orientalis; Billbugs, Spherophorus spp.; Annual bluegrass weevil, Hyperodes spp.; Black turfgrass ataenius, Ataenius spretulus and Aphodius spp. and mole crickets, Scapteriscus spp. MARATHON II can also be used for suppression of cutworms and chinchbugs.

For optimum control, make applications preceding or during the egg laying period of the target pest. The active ingredient in MARATHON II has enough residual activity so that applications can be made preceding the egg laying activity. Application timing can be based on historical monitoring of the site, previous records or experiences, current season adult trapping or other methods. Most favorable control will be achieved when applications are made prior to egg hatch of the target pests, followed by sufficient irrigation or rainfall to move the active ingredient through the thatch.

Do not make applications when grassy areas are waterlogged or the soil is saturated with water. Sufficient distribution of the active ingredient cannot be achieved under these conditions. The treated grassy area must be in such a condition that the rainfall or irrigation will penetrate vertically in the soil profile.

Application cannot exceed a total of 1.6 pints (0.4 lb of active ingredient) per acre per year.

Application Equipment for Use on Grassy Areas in Nurseries

Apply MARATHON II in enough water to provide sufficient distribution in the treated area. Use accurately calibrated equipment typically used for the application of soil insecticides which will produce a uniform, coarse droplet spray, using a low pressure setting to eliminate off-target drift. Check calibration periodically to ensure that equipment is working properly.

(See label for complete list of application rates and instructions).


This is highly toxic to aquatic invertebrates. Do not apply directly to water, to areas where surface water is present or to intertidal areas below the mean high water mark. Do not contaminate water when disposing of equipment washwaters.

This is highly toxic to bees exposed to direct treatment or residues on blooming crops/plants or weeds. Do not apply this or allow it to drift to blooming crops/plants or weeds if bees are foraging in the treatment area.

This chemical demonstrates the properties and characteristics associated with chemicals detected in groundwater. The use of this chemical in areas where soils are permeable, particularly where the water table is shallow, may result in groundwater contamination.

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Will Marathon II Insecticide pass marijuana testing?

Marathon II is not labeled for marijuana use. We recommend reaching out to your local Dept of AG for a list of approved products. 

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What is the ratio of Marathon II Insecticide to mix for web worms in pecan trees?

Marathon II Insecticide is mixed at 0.45 to 0.6 fl. oz. per 1000 sq ft which is usually to a gallon of water.   Please refer to the product label for complete instructions.

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Can Marathon or Marathon II be used on greenhouse basil?

Per the product label, Marathon II can be used in greenhouses but does not specifically list basil.

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If I'm doing a soil drench in 3 gallon pots, how much Marathon II Insecticide do I use per gallon to kill root aphids?

According to the Soil Drench & Irrigation Chart on page 9 of the product label for a 3 Gallon Pot, Marathon II Insecticide would treat 220-165 pots at the labeled rate of 1.7 fl oz in sufficient water volume to wet the potting medium. To avoid leaching, use 1.7 fl. oz. (50 mL) of Marathon II Insecticide in the appropriate amount of water to treat the number of pots based on the pot size as stated in the table. 
If you are only treating a few potted plants, OHP Marathon 1% Granular or Bonide Systemic Granules would be alternatives to treat for root aphids. These products are applied as a topical application directly to the top of the soil, lightly mixed in not to disturb the roots and then watered in with sufficient water volume to move and dissolve the granules into the soil. 
For a 3 Gallon Pot, OHP Marathon 1% Granular is applied at 3 2/3 to 7 1/3 level teaspoons per plant and Bonide Systemic Granules, is applied at 1/2 cup per plant. View the full product labels for more information.  

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