Insecticides (Liquid Concentrates)
Some concentrates are intended for dilution only with water, some only with oil (kerosene or diesel) and some concentrates can be diluted with either oil or water. Depending on the product formulation application of the diluted ready-for-use product can be made through hot or cold fogging device. As the name suggests such products are usually applied into the air at the time when the target insects, flies or mosquitoes, are most active. This may be during the day for flies or certain species of mosquito or at dusk for most biting insects (most mosquitoes, midges etc). there are many products available for use as space treatment agents. They differ specifically in regard to the nature and quantity of killing agent (potency), the quantity of additional knock-down agent (speed of control) and the levels of synergist present (durability of control in respect of actual or perceived insecticide tolerance).
Suspension Concentrate (SC)
In this formulation type an insecticide active ingredient is adsorbed onto a filler which is then suspended in a liquid matrix (usually water). This formulation type has many of the benefits of a WP without some of the disadvantages, SC’s are non-dusty, easier to dose and disperse in water. Like WP’s when an SC is sprayed onto a sorbtive surface the insecticidal particles remain on the surface of the substrate where they are readily available to the target pest. Suspension concentrates therefore provide a good level of residual control on a wide range of surfaces.
An example of a suspension concentrate offered by PelGar is given below.
This type of formulation has the benefits indicated above for SC’s but also incorporates another active ingredient, often a knockdown agent, in the liquid phase so combining good residual control with fast flushing and knockdown of the target pest.
This formulation type presents the active ingredient as extremely small droplets, sometimes referred to as nano-technology, in a solvent-free, high surfactant liquid phase. ME concentrates have a slightly ‘soapy smell' and dilute in water to provide a clear, stable ready-for-use liquid. This provides a concentrate that dilutes in water to provide a clear, very stable product. The small droplets of active substance provide an extraordinarily large number of point sources of contact which make it impossible for the target insect to avoid chemical ‘pick-up’on a treated surface. The high loading of surfactants also facilitates the rapid penetration of the insect’s cuticle.
This formulation type provides excellent residual control on non-sorbtive surfaces such as metal, ceramic tiles etc. but is not as effective on sorbtive surfaces when compared with SC’s and WP’s.
PelGar has developed a range of ME's incorporating combinations of conventional killing agents, knockdown agents, metabolic synergists and insect growth regulators.
Oil in Water Emulsions (EW)
In this formulation type the active ingredient is dissolved in a small quantity of oil that is then dispersed in water to produce a stable milky liquid. This type of formulation greatly reduces the amount of organic solvent used when compared to, for example, to emulsifiable concentrates.
As with ME’s this formulation type is particularly useful to use on non-sorbtive surfaces where the active ingredient will not be sucked into the matrix of the substrate.
particularly used this formulation type to develop a range of products
based on the insect growth regulator pyriproxyfen.
All the above products are available in a range of pack sizes including 5 and 25 litres.