How can I control and prevent grubs in the lawn?

You have a beautiful lawn and in no time the lawn has become a havoc. You get bald spots in the grass and birds peck at the lawn. This brings even greater harm. In this case, you have a good chance that grubs or leatherjackets are present. Organifer Grass Insects easily treats lawns, sports fields or meadows.

How do you recognize an infestation of grubs?

Often you will first see brown spots in your lawn and the grass dies locally. Several birds will also pull tufts of grass from the lawn. The birds help, because they actually go looking for the grubs, it is their food. A grubs is a larva of several species of the leaf beetle. Surely the most common in the garden is from the cockchafer. But there are other species of beetles in which the larva are called grubs:

  1. From the rose chafer or Phylloperta horticolain
  2. Mayfly or Melolontha melolontha
  3. The June beetle Amphimallon solstitialis
  4. Larvae of the July beetle aka Polyphyla fullo
  5. From the salland beetle or Hoplia philanthus
  6. The rusty brown leaf beetle
  7. The common leaf beetle or Anomala dubia

What types of grubs are there?

larvae of the rose chafer, among others.

You see them flying by! The low flights just above the lawn are very typical of the rose chafer. In flight, they eat flower buds and leaves of various hardwood crops for about 3 weeks. When you see them flying, the females have already laid most of their eggs. About 6 weeks afterwards, the first larvae develop.

They begin feeding on humus material as soon as they crawl out of their eggs. During the second larval stage, they feed on hair roots. In the third stage, the larvae feed on the roots of the lawn and other plants. As a result, the grass no longer absorbs water and nutrition and dies. In spring, this can already be seen in the color of the lawn.

In the places where the larvae are, the lawn will be less fresh green and develop yellow-brown blades. Starting in July, the grass no longer grows well in the places where the larvae are. Sometimes the turf has deteriorated to the point where it can be loosened and rolled up. Below you will find the larvae, sometimes hundreds together.

May beetle larvae are the most common grubs

The chickadee flies from the last week of April until mid-June. During this time, they mate and lay eggs. The grubs of this beetle live underground for 3 years. Depending on climatic conditions, development can take as long as 5 years. They feed on the roots of all types of crops: boxwood, plants, conifers (such as piceas, yews, beeches, oaks ), laurel, fruit trees, hydrangeas and grasses, including lawns/grasslands and sports fields. In fact, they are polyphagous, that is, omnivores. They also cause a lot of damage to lettuce and potatoes in vegetable gardens.
Plants whose root systems are eaten by grubs become susceptible to a variety of diseases and pests and eventually die.
The grubs that attack the roots starting in spring go into hibernation in October and will not come up to eat at the roots until early May. Some of these enter larval stage 3 pupating in July. The beetle hatches in late August – early September and overwinters underground as an adult until late April.

June beetle

June beetle grubs live exclusively on roots of various types of grasses. This beetle prefers dry conditions. Currently the June beetle is found in a number of places in the central, eastern and southern parts of our country, especially in sports fields, pastures and occasionally in gardens, but they really only eat grasses!

June beetle and its larvae

The July beetle is found in coastal areas. Its development is similar to that of the May beetle. This beetle is rare and does not cause damage to gardens. You will see it mostly in pine forests along the coast, during the months of June to August. They often live high in trees and are therefore difficult to find. The beetle eats pine needles and can stridulate (make noises) very loudly, especially when disturbed it lives underground and eats from grass roots!

Larvae of the salland beetle

These occur mainly in grass. It is one of the few species that remain active in winter. They are not susceptible to frost. salland beetle larvae eat mainly roots of a variety of grasses. Especially in sports fields and gardens, they cause great damage.
The first beetles can fly as early as late April, but they usually peak in June. The Salland beetle takes 2 years to grow from grubs to beetles.
Because you never see them flying en masse, controlling them is more difficult. throughout the year we find various stages of these grubs.
Do you suffer from grubs in the winter? Then chances are you are dealing with the salland beetle.

The larvae of the Rusty brown leaf beetle

Larvae of rusty brown leaf beetles can be a real pest in your ornamental garden. Except in boxwood, this beetle’s grubs can be found just about anywhere, including ornamental shrubs, perennials, trees and in evergreens such as yew. Development from egg to beetle takes 2 years.
The adult beetle is reddish-brown and has no set flight pattern. They occur from late April through September. These beetles fly during the day, as well as at night and gravitate toward light.
The rusty brown leaf beetle larvae do not hibernate. At 0º C, they continue to feed on roots, causing many plants to die at high infestations.

The anomala dubia

The species anomala dubia (Dutch name: anomala beetle) has been a common species since 2006. The adult beetle appears in various colors, one of which looks strikingly like a large pink beetle. Development from grubs to beetles takes 2 years.
The beetles can be observed as early as mid-May in the south. In other parts of the country, the beetles can be found from June to August. They are found in grasses, ornamentals, conifers, fruits and asparagus.
The beetle can eat a large amount of flowers and leaves from various garden plants and fruits in a short period of time.

Grass damage caused by grubs

The well-known eaters of grass roots can cause considerable damage. As a result, the lawn does not absorb enough moisture and nutrition to keep the grass green. However, the greatest damage to the lawn will come from the birds that see the grubs as a delicacy. They turn the entire lawn upside down to pick out grubs from under the grass. The spots can be several square meters in size. Restoration of the lawn is then often only achievable through new seeding.

How does the grubs live

As described earlier, the grubs are larvae of a beetle. These beetles emerge in spring in mid-April/June. In the spring, these creatures go in search of food, mostly feasting on vegetation and fruit. When the beetles have enough food they will start to reproduce under the right conditions. So they will start laying eggs in the lawn.

Larvae called grubs will be born from these eggs after four to six weeks. These grubs will immediately start feasting on the roots of the lawn. They will continue like this until winter comes. When it is winter, the larvae will crawl deeper into the ground and will overwinter there. During this time, the larvae are in a sort of dormant state and will not feast on the lawn. When the soil warms up again in spring, the critters become active again and pupate into beetles. Then the full cycle begins again.

combat and prevent?

Organifer Grass Insects Concentrate will be rapidly absorbed by the roots and leaves of the grass plant after administration. It increases the resilience of the plant, which will develop its own defense system, so to speak. It also affects the soil in beneficial ways. The plant’s roots are stimulated, restoring healthy growth. Leatherjackets and other harmful larvae will avoid the plants. The larvae no longer find the roots and leaves attractive. With preventive use, the larvae of Leatherjackets, larvae and Mourning Flies will no longer reach pupal stage.

The grass will become healthier, the roots will grow again and also become less attractive to pests. This product is specifically designed for lawns, grasslands and sports fields.

Administration Organifer Grass Insects Concentrate.

The ideal treatment to control grubs is prevention with a preventive treatment. We recommend the following administration for optimal effectiveness:

1)Apply early period spring (April/May)

2)Period summer administration (June/July)

3)Period autumn administration (September/October)

If damage has already occurred, three treatments can be started at any time in quick succession at 4-week intervals. Then next spring pick up treatment as scheduled to prevent beetles and grubs preventively.

Repair bare spots in lawn

To restore bare spots in the lawn or turf, we recommend overseeding with grass seed. Recovery by Organifer concerns the ideal repair formula for renovation/ overseeding of all types of lawns following the Fast Repair approach. Super-fast germination and establishment in existing grass due to its tremendous competitiveness. Fills bare and open spaces at breakneck speed. The result is a total makeover at a manageable cost. Every lawn becomes like new again.