April and sept best. Apply after lots of daddy long legs flying about. Best above 12*c

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Nemasys

Q: I have just discovered that leatherjackets are responsible for my poor lawn. Will this work in April?

Nematodes will control leatherjackets provided the conditions are right. The soil needs to be warm and wet and the leatherjackets need to be at the right stage of their life cycle. The best time of the year to treat is when the young are first emerging in the autumn. However the nematodes can also be used in the spring once the soil has warmed up. A good rule of thumb is to treat as soon as you have grass growing, but don't leave it so late that the leatherjackets have started to pupate ready to fly off and breed. April can be just about right.

Q: My lawn has a mix of eggs, flies and leatherjackets. Will product work if applied now(start of August)?

September/October is better, and this does the job well. Don't order to early as it only has a fridge life of about 3 weeks. there is another similar product for other infestations, I used both.

Q: How long does it take for the treatment to work?

No difinitive answer, as they have to hatch and deal with the leather jackets. Best to apply in September after the crane fly have emerged to lay their eggs. Repeat in the spring when warm enough. Our lawn is beautiful now after above treatment.

Product ID: 49523584

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Item form
Powder
Brand
Nemasys
Specification met
USDA
Target species
Nematodes

🌱Millions of natural nematodes

💧Easy water-based application

🛡️Safe for kids, pets & wildlife

Frequently Bought Together

Nemasys leatherjacket killer (100sqm pack)

Nemasys Leatherjacket Killer nematode treatment (200 sqm)

Nemasys Leatherjacket Killer nematode treatment (100 sqm)

Description

🌿 Own your lawn’s future—naturally unstoppable pest control!

EFFORTLESS APPLICATION - Simply mix with water and apply using a watering can or EasyNem Applicator—no fuss, no mess.
FLEXIBLE COVERAGE STORAGE - Treats up to 100 sqm in Autumn or 50 sqm at double strength; keep refrigerated for up to 2 weeks for perfect timing.
FAMILY ECO FRIENDLY FORMULA - Totally safe for children, pets, and wildlife—protect your lawn without compromising your loved ones.
NATURAL PEST CONTROL POWERHOUSE - Harness millions of Steinernema Feltiae nematodes to naturally eliminate leatherjackets without chemicals.
SEASONAL PRECISION FOR MAXIMUM IMPACT - Optimal use in Autumn when soil temps hit 10°C ensures peak nematode effectiveness and lawn protection.

Nemasys Leatherjacket Killer delivers millions of natural nematodes (Steinernema Feltiae) to effectively control leatherjackets on lawns. Designed for easy water-based application, it’s safe for children, pets, and wildlife, with optimal results in Autumn when soil temperatures reach 10°C. Each pack treats 100 sqm at standard strength or 50 sqm at double strength, with a 2-week refrigerated shelf life to ensure freshness and potency.

Specifications

Manufacturer	Becker Underwood
Item Package Quantity	1
Specification met	USDA
Batteries included?	No
Batteries Required?	No

Have a Question? See What Others Asked

I have just discovered that leatherjackets are responsible for my poor lawn. Will this work in April?

My lawn has a mix of eggs, flies and leatherjackets. Will product work if applied now(start of August)?

Can I treat in march

How long does it take for the treatment to work?

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