Dylox 420 SL Insecticide

4.5 out of 5 stars 7 Reviews | 18 Q&A

Dylox 420 SL Insecticide

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Average Rating

4.5 out of 5 stars Rating: 4.6

7 Reviews | 18 Q&A

Product Overview

Dylox 420 SL Insecticide provides fast acting grub control. Dylox 420 SL Insecticide treats surface feeding insects on lawns, landscape and recreational turf, such as golf courses. After irrigation or rainfall, grub control is established in as little as 24 hours and penetrates thatch up to ½ inch thick. Dylox 420 SL Insecticide works by both contact and ingestion. This kills insects on landscape flowers, trees and shrubs instantly within contact. This also works on lawns and turf against damage from predators such as birds, raccoons and skunks. Dylox 420 SL Insecticide is known to be the best product available for third instar grubs because it works later in the season and provides a longer effective application window than other competitors.

Features and Specs

Active Ingredient Trichlorfon 37.3%
Target pests Armyworms, Chinch Bugs, Cutworms, Japanese Beetles, June Beetles, Mole Crickets, Sod Webworms, Bluegrass Weevils (larvae and adult), Webworms, White Grubs and others
* See label for complete list
For use in Commercial & Residential Outdoors: Turf-grass and Landscape Ornamental Flowers, Shrubs & Trees; Golf Courses, Athletic Fields, Parks and others
* See label for complete list
Application 4.6 - 6.9 oz per 1,000 sq. ft.
* See label for complete application instructions
Pet safe Yes, if used as directed on label - Safe when dry
Formulation Professional Product
ME (Restricted To Licensed Applicators Only)
Shipping Weight 25.70 lbs
Manufacturer Envu (Formerly Bayer) (Mfg. Number: 79105568)
EPA Registration 5481-643-432


Dylox 420 SL is compatible with registered pesticides, fertilizers or micronutrients.

Mixing Instructions

  1. Fill the spray tank 1/4 to 1/3 full with clean water
  2. While recirculating and with the agitatior running, add any products in PVA bags
  3. Continue to fill spray tank with water until ½ full
  4. Add any other wettable powder or wettable granules products
  5. Add any flowable ( FL or SC type products)
  6. Allow enough time for thorough mixing of each product added
  7. Add the required amount of Dylox 420 SL Turf and Ornamental insecticide and any other ‘SL’ type products; emulsifiable concentrates (EC), fertilizers, micronutrients and spray adjuvants
  8. Fill spray tank to desired level and maintain constant agitation to ensure uniformity of spray mixture

NOTE: Do not use PVA packets in a tank mix with products that contain boron or release free chlorine. The resultant reaction is a plastic that is not soluble in water or solvents.

Aerial application is prohibited. Not for use through any type of chemigation system. Do not use this product on turf being grown for sale nor is it for the use of crops used for food or forage.

Limit applications to 3 per calendar year with re treatment intervals of 7 days for turf. Do not apply more than 24.5 lbs of active ingredient per acre per year for controlling grubs and no more than 16.2 lbs for surface feeding insects.

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Sort Reviews
  • 5 of 5 Stars

    Dylox 402 SL for white grubs

    By Brent on 05/14/2014

    Verified Purchase

    We tried GrubEx, Diazinon, and most other big box store products over the past 5 years or so with no noticeable impact on our lawn's grub infestation. This product killed the grubs overnight, after watering in. Birds no longer dig out grubs to eat, they just feed on surface insects now. Our lawn is coming back nicely. I applied this in May when the grubs were quite large and the product worked perfectly. I used the label suggested rate of 6.9oz/1000sqft.

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    42 of 43 people found this review helpful

  • 2 of 5 Stars


    By Roger on 10/16/2016

    applied product 2 weeks ago and had no effect on grubs ,very disappointed in the results,I thought this product was superior then Grub X .I am very disappointed in this product .

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    9 of 15 people found this review helpful

  • 5 of 5 Stars

    Grub control

    By Jose on 10/01/2018

    Excellent product to control grubs. I used to use imidacloprid, but this year even after spray preventive in June I notice almost the entire lawn turning brown, after digging out a piece of sod I notice a lot of grubs, count 11 in a 1'x1' I decide to try Dilox 420 SL , so I Ordered from domyown, then spray it on the lawn, I was lucky it rain right After spray the insecticide and this went in the soil where grubs was, two Days later check for grubs again and the problem was solved.

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    9 of 9 people found this review helpful

  • 5 of 5 Stars

    Great Experience

    By Sherman on 06/29/2017

    Had inventory, shipped timely and arrived in perfect condition. Will use Do My Own for the foreseeable future. Thank you

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    4 of 6 people found this review helpful

  • 5 of 5 Stars

    Product and Service Excellence

    By Patricia on 08/16/2019

    2nd time to purchase this product. Both times order was a fair price and delivery on time! Doesn't get better than that!

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    1 of 3 people found this review helpful

See all 7 customer reviews

Questions & Answers

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Sort Questions
On the average, how many gallons of water per 1000 square feet would be considered adequate?
On average you would use about 2 gallons of water per 1000 sq/ft.

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45 of 81 people found this answer helpful

What is the ratio of Dylox Concentrate per gallon of water?

How many gallons of Dylox does each 2.5 gal of the concentrate make.

The mixing ratio for Dylox 420 SL Insecticide is dependant upon what you are treating for. Typically, you would use 4.6-6.9 oz per 1,000 square feet. Therefore, one 2.5 gallon jug of Dylox 420 SL Insecticide will cover 46,000-69,000 square feet depending on the ratio used. The amount of water is not as important as making sure to mix specified dosage of DYLOX 420 SL Turf & Ornamental Insecticide in sufficient water to provide adequate distribution during application to lawn, turf or groundcover area.

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19 of 28 people found this answer helpful

Can I use Dylox 420 SL while I'm seeding?

I have grass seeds on the ground that have not yet germinated. If I spray Dylox before germination while it kill the grass seeds? If so, how long should I wait before spraying?

Dylox 420 SL Insecticide can be applied while you are seeind. In fact it would be a good thing, since you would be watering more often. 

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13 of 13 people found this answer helpful

Is Dylox 420 SL Insecticide safe for humans and pets?
Dylox 420 SL Insecticide is safe for humans and pets once the area that has been treated has dried. Please follow the label insturctions for application guidelines.

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12 of 12 people found this answer helpful

Will Dylox 420 SL Insecticide kill Billbugs and Grubs?

Looking for a product that will eliminate billbugs and grubs fairly quick. I have tried a number of things with very little to no success over the course of 16 years. I tried Bifen and it helped somewhat, but not the desired results. Will Dylox 420 work with billbug's? I noticed that will work with grubs. I'm just tired of trying with really no results. If there are a couple of products that you recommend, for the two listed pests please let me know. Just wanting the results I have been chasing for 16 years now. Thanks for your help.


Dylox 420 SL Insecticide would only help you with the grub issue and if they are actively feeding, it is not labeled for bill bugs. The best time of treatment for billbugs is the same as the grubs, before they hatch so usually in the spring time is best. We would recommend Merit Insecticide Granules for an early treatment and you can contact your local cooperative extension office if you're not sure when billbugs or grubs hatch in your region. When adult billbugs are first seen, Talstar P (Bifenthrin) or Tempo SC Ultra (Beta-Cyfluthrin) can help. We recommend to look over our billbug treatment guide for further information.

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11 of 11 people found this answer helpful

See all 18 customer questions

Dylox 420 SL Insecticide 4.5 out of 5 stars Rating: 4.6 (7 Reviews / 18 Q&A)

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