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Authorisation Number: 
Reg. No. L7824 Act / Wet No. 36 of / van 1947
Pack size: 
WD Water dispersible granule formulation
Mode of action: 

Thiamethoxam can be absorbed by the leaves and crowns of the plant, it is therefore important to apply in a high volume application and watering the product in as soon as possible (the target pest is soil borne). Absorbtion through roots, after application to the root zone, normally happens over time and is facilitated by soil moisture. It is transported acropetally (upwards) in the xylem. This systemic translocation contributes to even distribution of the active ingredient within the plant tissue. Bio-availability of soil insecticides is very important to ensure high standard efficacy in all soil moisture conditions.

Save up to 60,000 litres of water per hectare.
Greater availability in dry conditions.
Season long control of grubs.

Irrigation savings “washing in” after application
Meridian® can help to save up to 60,000 litres of water per hectare during post grub-insecticide application “wash in”. The superior solubility of the active ingredient – thiamethoxam (neonicotinoid) – is the main reason for this ben efit. Thiamethoxam is approximately 8 times more soluble than imidacloprid (Fig. 1), thus increasing robustness and water savings during incorporation.
Meridian solubility

Effective in wet and dry soil conditions
Neonicotinoids age in soil, with the majority of the active ingredient available during the first 30 days dissolved in soil moisture. Increased solubility of thiamethoxam during this time will ensure elevated levels of availability and thus effi cacy in drier soil conditions. In the longer term (20-100 days), thiamethoxam will bind to soil, to be released more readily back (desorbed) into solution than imidacloprid. This is called bio-availability, meaning the active ingredient is available to the biological system – plants for uptake and/or contact with burrowing grubs. Higher bio-availability contributes to higher levels of effi cacy. Meridian will ensure high level performance in most soil conditions (Fig. 2). Meridian may therefore perform better than imidacloprid in drier soils such as fairways, semi-roughs, ovals and parks lacking regular irrigation (Fig. 3)

Meridian soil availability

Performance in dry soil
Season-long control of grubs

White grubs

These fleshy, white, C-shaped insects which often have a blueish hind end the larvae of scarab beetles. They live in the soil, feeding on humus and the roots of plants. They are often associated with the roots of lawn grasses where they may become troublesome sporadically. In general, they tend to become troublesome where the natural vegetation is removed and replaced by other plants.


Their subterranean nests are indicated only by holes on the surface surrounded by small mounds of loose particles of soil. They emerge at night or on cool days in winter, cutting bits of grass and carrying them away to their nests. In the summer rainfall areas they can do a great deal of damage to lawns during the dry winter. They can be distinguished from the fungus grower termites by their darker (brownish) body colour, as well as by the fact that they have eyes, absent in the fungus grower species.


Mole cricket

Both adults and immatures can become trouble-some on lawns, causing disfiguring tunnels and then feeding on the grass around the holes at night. The damage is especially noticeable during dry periods. Seedlings and young plants may also be attacked. Considerable damage may be done to strawberries where both foliage and fruit are eaten. Mole crickets differ from other crickets in that the front legs are adapted for digging. They feed on the roots of plants and may do extensive damage to potatoes by eating holes in the tubers. Lawns may also be disfigured by their habit of pushing up small piles of earth.


Only a small group of fungus-growing (or leaf cutting) ants cause direct injury to plants, by cutting pieces of leaves to serve as a substratum for their fungus-gardens (e.g coffee and citrus in South America). The majority, however, are predators or necrophages of their insects, or feed on plant secretions, sweet liquids such as honeydew (excreted by aphids, scale insects and mealy bugs ) or grass seeds. Often, however, some species become indirectly harmful to plants by interfering with the natural enemies of aphids, scale insects and mealy bugs. Ants running up and down garden plants are a good indication of the presence of these other pests, which are protected by the ants in return for the honeydew they secrete. In homes they may become a nuisance by making their nests in the potting soil in potplant containers.

Get Preventive and Curative Control of Grubs, Ants and Other Turf Insect Pests with Meridian Insecticide
Meridian® insecticide is a proven leader for preventive and curative control of soil and foliar pests such as chinch bugs, ants, grubs and other surface feeders. Applied foliarly or as a soil application, it provides pest protection in a wide range of areas including lawns and landscape ornamentals such as bedding plants, trees and shrubs.

Curative White Grub Control
The active ingredient in Meridian, thiamethoxam, moves systemically throughout plants to provide curative control of white grubs and to quickly prevent damage to turf. Additionally, Meridian is metabolized slowly in the leaf tissue for long-lasting control.

• When used as a curative treatment, Meridian should be watered in within 24 hours of application to move the product into the root zone.
• White grubs that contact or ingest Meridian are affected and mortality occurs quickly to prevent further turf damage.
• Meridian controls grubs through the second instar (July through August), reducing the need to purchase an additional and expensive curative product.
• The same curative grub application of Meridian is also effective on pyrethroid-resistant chinch bugs.

Prevent More Pests with Less Effort
Meridian also provides preventive control for lawn care operators. Even if there is no rain or irrigation for up to seven days after application, Meridian maintains its efficacy in the soil, making it an effective preventive control option.

Protecting Landscape Ornamentals
One of the most differentiating features of thiamethoxam is its systemic activity in plants. When applied to soil, the active ingredient is absorbed through the roots and spreads  throughout the plant. When applied foliarly, the active ingredient is transferred through the canopy of the plant. As a result, key landscape ornamental pests such as aphids, mealybugs, scale, white flies and tent caterpillars are also controlled.

Why Choose Meridian?
When compared to Merit® insecticide, Meridian scores high marks:

• Meridian is labeled for control against a broader range of landscape insects including ants, sod webworms, plant bugs and tent caterpillars.
• Meridian demonstrates a favorable 40 percent plant uptake rate 24 hours after treatment.
• Meridian remains effective up to seven days after treatment, even without watering in from rain or irrigation.

Flexible Application to Fit Your Needs
Meridian widens the window of application for flexible, preventive control by providing season-long control on your schedule. If you miss the early window for application, Meridian can be applied later in the season. With two formulations, you can apply Meridian in the most efficient way for your business.

• Meridian 0.33G: a spreadable granule sold in a 40- lb. package
• Meridian 25WG: a water-dispersable granule used for spray applications that is sold in 17-oz. and 102- oz. packages.

Quick movement into the Grub zone

Turfgrass soil insecticide comparison

Labelled use rates by formulation
Key Features of Meridian

• True broad-spectrum control of surface-feeding insects including white grubs and chinch bugs.
• Wide application window for flexible preventive control.
• Curative control through second instar.
• Highly systemic movement of the AI means faster control.
• Relaxed watering in requirements when applying preventively.

Order Syngenta Turf Products
Talking Turf are our distributors in South Africa, to buy Syngenta's Meridian Insectide today, just click here to place your order.

Lawns and Turf

Legal warning

Re-entry Period

  • Re-entry: Do not enter treated area until spray deposit has dried unless wearing protective clothing.

Hazard Statements

  • Handle with care

Precautionary Statements

  • Avoid contact with eyes. Wash with soap and water after use Wash contaminated clothing after use Do not eat, drink or smoke while mixing or applying the product or before washing hands and face.

Personal Protective Equipment

  • Wear rubber gloves and overalls when mixing and rubber gloves during application.

Other Restriction of Use

Excessive thatch may reduce the efficacy of MERIDIAN.

Tank mixing

Water volume

Apply in 10l water per 100m2


Adapt the pressure for each spray-type.


1 hour

Tank mix lifespan

Do not prepare more mixture than is needed for the immediate use.

Tank mix stability


Type Title Description
To preserve the environment


Avoid spraying during the heat of the day or when dew is present. Do not apply as a foliar spray when honeybees are present.

  • EMERGENCY TEL.: ++27 (0) 8312 33 911


    • Contains Thiamethoxam which is absorbed by both roots, leaves & crowns. Used as a foliar or soil drench application
    • Thiamethoxam will stimulate root mass & rot hair development


    • Moves in xylem to control sucking & biting pest of turf including mole crickets
    • Improves drought resistance and encourages strong leaf & stem growth