When to Apply Grubex? Lawn Safety Tips

When-to-Apply-GrubExIf you want your lawn to look its best, there’s no doubt that GrubEx is a key ingredient. If you are experiencing brown patches on your green carpet, GrubEx is a natural and organic product that helps keep your lawn healthy and free from pests.

It works by dehydrating and killing lawn pests, such as grubs and beetles, so you can rest easy knowing that your lawn is in good hands. Now the question arises when to apply Grubex? Here are a few tips to help you decide the best time to apply to GrubEx!

When to Apply Grubex – Amazing Facts

GrubEx kills weeds before they even have the chance to sprout up through the soil. Grubs are the larvae of various beetles, including June and Japanese.

This is a poisonous chemical that works by preventing the germination of weed seeds. Spraying it on your lawn prevents new weeds from growing for up to three months after application.

GrubEx is a soil insecticide that can use to control grubs on your lawn. Grubs are the larvae of insects like chafers, cutworms, and Japanese beetles. They feed on grass roots, which can weaken and kill the turf. GrubEx can also control other pests like mole crickets, millipedes, and earwigs.

Facts To Know

Best Temperature

GrubEx should be applied when the temperature is above 50 degrees Fahrenheit

Moist Soil

Moist Soil

The soil should be moist but not wet at the time of application. You should wait until after rain to apply this product because it will be more effective if it gets wet in the soil before being eaten by the pests that you are trying to kill.



If your lawn has been attacked by ants, during early spring or late fall, when temperatures are cool enough for them to move around easily. It does not matter whether or not you see ants on your lawn at this time of year because they will be coming out from their nests later in the year once it starts warming up again.

Hatches Grubs

GrubEx works best when you apply it before the grubs start to hatch. For example, if sod webworms or mole crickets are already damaging your lawn, you should apply GrubEx as soon as possible.

Beetles Can’t kill by GrubEx

If you have a problem with adult Japanese beetles and other pests that feed on your trees and shrubs, then one application of GrubEx will not kill all of them. However, it will reduce their numbers significantly, so they do not do as much damage over time.

Non-Toxic Solution

GrubEx is non-toxic to humans, pets, and wildlife (but always keep it locked up).

Worst Smell

Ants and roaches hate the smell of GrubEx so that they won’t cross its path. The active ingredient in GrubEx is di-n-propyl phthalate (DPP), an organic compound that smells like citronella oil. This smell deters ants from entering areas where the product has been applied.

Safe for Grass and Plants

It is safe for all lawns, including Kentucky bluegrass, fescue, Bermuda grass, and bentgrass. GrubEx can also be used on golf courses and sod farms.

Harmful for Pests Only

GrubEx does not harm beneficial insects such as bees and earthworms. It also does not affect plants or animals other than target pests.

Fungal Infections

It can also treat various fungal infections in the garden, such as powdery mildew and black spot on roses.

Dehydrate Pests Within 24 Hours

Grubex will work within 24 hours after application if used as directed on the label. Once applied, it begins working by digesting through its exoskeleton (outer shell), which causes them to dehydrate and die within 24 hours or less, depending on how much rain falls after application or if there are high winds present during the application period.

Types of Grubs

The following are some of the most common types of grubs that Grubex kills:

Sod Webworm: Sod webworms are the larvae of the gray lawn moths; they feed on grass leaves and stems.

Yellow striped Armyworm: The yellow-striped armyworm has yellow stripes on its body and two rows of black dots running down its back.

European Chafer Beetle: Adult beetles are about 1/4-inch long, brownish-black with white spots on their wing covers (elytra).

Best Time Round the Year to Use GrubEx

Grubex is a natural and safe product that can apply in any season. The best time is when the soil temperature is above 5°C (41°F).

The best time around the year for usage of GrubEx is:

  • Spring – April to June
  • Summer – July to September
  • Autumn – October to December

After Rain

The best time to use Grubex is in the fall and spring when grubs are actively feeding. Grubex can be applied anytime after it rains.

Pre-Emergent Control

Grubex can be used for pre-emergent control of white grubs in turfgrass. Applying at a rate of one pound per 1000 square feet will provide control for up to two years.

White Grub Infestations

Grubex can also be used to treat existing white grub infestations. You must apply Grubex before the larvae are large enough to move into the soil profile (usually mid-May).

Cautions While Applying GurbEx

  • Windy Days: The manufacturer recommends not applying Grubex on windy days or when it rains or snows. 
  • Avoid Rainy Days: If rain is expected within 24 hours of application, do not apply Grubex, as this will wash the product away before it has time to work. Additionally, avoid applying Grubex in areas where children play or walk, as even small amounts could be poisonous if ingested by children or pets.
  • Don’t Left on Top of The Ground: Grubex is effective for up to six months after application, but it will lose its effectiveness if left on top of the ground, where it can dry out or wash away. To ensure that your lawn remains free from pests, apply Grubex each year prior to their mating season.
  • Protective Clothes and Gloves: Homeowners can use Grubex on their lawns, but it is also approved for use by professional applicators. When using Grubex, it is important to follow the directions carefully and wear protective clothing and gloves.
  • Suitable Temperature: Grubex should not be applied when temperatures exceed 80 degrees Fahrenheit or below 45 degrees. This product should not be used during active rain or if rain is expected within 24 hours after application.

When to Apply Grubex (FAQs)

  1. When should I apply for Grubex?
  2. Grubex is a soil drench product and can be applied anytime the ground is not frozen. 

Q: Why use Grubex?

A: Its quick-acting formula kills all of these pests within 24 hours of application.

Q: How long does it take for Grubex to work?

A: Within 24 hours of application, Grubex will start killing grubs on contact with direct contact with treated areas.

Final Words

Grubex is the best remedy for your lawn when it’s been attacked by grubs. It helps restore your lawn’s beauty, health, and productivity after waging war against grubs. You may succeed in killing these enemies by ruining your garden and plants. You only need to follow the instructions and apply at the right time of grub’s mating season.

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