Dimilin 2L

An insect growth regulator which disrupts chitin deposition and prevents moulting of porina caterpillar, clover flea of pasture and sciarid fly of mushrooms.

  • Excellent control of porina for up to 3 weeks
  • Easy to mix and apply
  • Non-toxic to non-target organisms
  • Highly compatible
  • Remains active under frost conditions


Active Ingredient:   240g/L Diflubenzuron


Formulation:             Suspension Concentrate


Application Information

Crop Insects Controlled Rates

Porina Caterpillar

Clover Flea




Sciarid Flies (Compost Incorporation)

Sciarid Flies (Drenching)

 40ml per cubic metre

4ml/2.5L of water per square metre

Pasture Application Directions

Porina Caterpillar: Applications should be directed against late surface or early tunnelling stages, ideally before the caterpillars have grown to 20-25mm long. Sprays should be applied to short, dry, fresh pasture, preferably following rain.

Clover Flea: Apply at the first signs of pest. Applications are most effective when applied in April to early May when nymphs emerge from resting eggs, to reduce the reproductive opportunity of subsequent generations in winter.


Pasture Withholding Period

7 days


Porina – Life Cycle and Biology

Adult Porina moths fly between spring and autumn. Common peak flights occur in October to November in early flight areas and January to March in late flight areas. In mixed flight areas there can be peak moth flights at both times. Each moth lays up to 2,800 eggs which take 3-5 weeks to hatch into surface dwelling caterpillars. These begin tunnelling after about 6 weeks, feeding on foliage (grasses and clover) at night and causing and increasing amount of damage as they grow. Porina are irregular feeders and may come up to feed only once a week. As they extend their feeding range, larger bare patches appear following flatweed and thistle infestation. Pasture damage is most evident in late winter and early spring.


Which Paddocks are at Risk from Porina Attack?

he paddocks most likely to suffer Porina attack are those with adequate cover during egg and surface dwelling stages. These include new pasture, hay, clover or grass seed paddocks, irrigated paddocks and turf. In early flight areas, paddocks should be surveyed from February and late flight areas from May. Where damaging populations are evident, spray Dimilin 2L as soon as possible.


Dimilin 2L – Targeted Porina Control

Dimilin 2L is an insect growth regulator containing 240g/L of diflubenzuron in the form of a suspension concentrate. The active ingredient must be eaten to have any effect. The Porina caterpillar feeding on Dimilin 2L is unable to rupture and remove it’s old skin and dies when it is due to moult.
Treated caterpillars appear to act normally until moulting, so plant damage is possible between treatment and death. It can take from 2 – 8 weeks, depending on caterpillar size, for death to occur. Dimilin 2L is best used early against young caterpillars, before pasture damage is severe. Dead caterpillars may not be found on the surface soon after application; they tend to die in their burrows. Dimilin 2L has a persistent action of up to 3 weeks on sprayed foliage, provided it is not grazed off. Dimilin 2L remains active under frosty conditions.


Spray Timing for Optimum Results

Dimilin 2L is best applied during the early tunnelling stages of Porina, before they have grown to 25mm long and before pasture damage is evident. This is around 12 weeks after peak moth flights. In early flight areas, this means spraying from February and in late flight areas from April. The threshold density for spraying is usually between 20 caterpillars/m2 (young pasture, light sandy loam, dry conditions) and 40 caterpillars/m2 (older pasture, heavy loam, high fertility, wet conditions).


Dimilin 2L – Low Toxicity to Non-Target Organisms

Dimilin 2L belongs to the group of insecticides call Insect Growth Regulators, so-called because they prevent insect larvae from being able to moult and thus causing their death. This specific mode of action means Dimilin 2L is non-toxic to humans, animals, birds fish and earthworms.



Dimilin 2L is compatible with most commonly used insecticides, herbicides and fungicides.