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.

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.

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

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.

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Nemasys leatherjacket killer (100sqm pack)

Nemasys leatherjacket killer (100sqm pack)

Product ID: 49523584

Details

Brand
Nemasys
Item form
Powder
Specification met
USDA
Target species
Nematodes
Unit count
1 count

🌱Natural nematodes power

💧Easy water mix & apply

🛡️Safe for kids, pets & wildlife

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Description

🌿 Defend your lawn naturally—because your grass deserves the best!

IMMEDIATE LAWN USE - Safe to use your lawn right after treatment—no downtime, just healthy grass.
SEASONAL PRECISION - Optimized for autumn use when nematodes are most effective, ensuring maximum pest elimination.
SIMPLE APPLICATION - Mix with water and apply using a watering can or EasyNem Applicator for effortless lawn treatment.
DOUBLE STRENGTH OPTION - Tackle mature leatherjackets in spring or summer with a concentrated double dose for guaranteed results.
ECO FRIENDLY PEST CONTROL - Harness millions of natural nematodes to target leatherjackets without harmful chemicals.

Nemasys Leatherjacket Killer is a UK-made, USDA-certified natural nematode powder designed to control leatherjacket larvae in lawns. Easy to apply by mixing with water, it targets pests safely without harming children, pets, or wildlife. Best applied in autumn for optimal effectiveness, this perishable product treats up to 100 sqm per pack and allows immediate lawn use post-application.

Specifications

ASIN	B000VPCUPW
Best Sellers Rank	4,298 in Garden ( See Top 100 in Garden ) 94 in Indoor Multi-Insect Control 248 in Outdoor Insect Control
Brand Name	Nemasys
Country of Origin	United Kingdom
Customer Reviews	4.2 4.2 out of 5 stars (4,926)
Item Form	Powder
Manufacturer	Becker Underwood
Specification Met	USDA
Target Species	Nematodes
Unit Count	1 count

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€ 52.73

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Austria.

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TrustScore 4.5 | 7,300+ reviews

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