As LARVEX monolayers do not act as chemical or biochemical toxic action, but by a physical ‘wetting’ action, this permits the water to enter the hydrophobic breathing passages, causing oxygen deprivation, asphyxia and drowning. This action is rapid in the case of pupae that can only obtain the necessary oxygen whilst at the surface. Larvae however can respire using dissolved oxygen and are less dependant on obtaining aerial oxygen at the surface.
Another important factor is that since the mechanism of LARVEX physical and not chemical the prospect of the evolution of resistant mutants is very low indeed.
LARVEX 100 is composed of 100% active monolayer ingredients. It is recommended for use against Anopholene and Aedes species in clean water catchments and potable waters (pools, wells, storage tanks, reservoirs, etc.) and for continuous flow treatments. It is especially effective against the later stage larvae and pupae, which have a high respiratory oxygen demand.
Anopholenes are most affected by monolayers, then Aedes followed by Culicenes.
The standard rate of application is 5 litres per hectare. LARVEX 100 should be gently "rained", sprayed or thrown onto the surface of the catchment but not jetted under the water surface. Larvex SHOULD NOT BE mixed with water before application, neither should it be stored nor used in vessels containing any aqueous materials.
Application should be as late in the day as possible, to the selected catchments around the periphery or along the edges. If the area is largely inaccessible then the LARVEX may be applied at the accessible points from where it will spread over the catchment. This can take time but complete coverage is obtained when further bulk LARVEX refuses to spread, remaining as visible globules. The indicator "indol" (available from Accotec) can be used to ensure surface is covered.
A second application, at the same dosage should be made between 5 and 6 days after the first, and then when 4th stage larvae reappear (approximately every 3-4 weeks).
LARVEX 100 was previously known as MOSQILTM.
Di-ethoxy cetostearyl alcohol (10%)
Mono-ethoxy oleic acid (90%)
These are water-insoluble surface-active agents derived from natural vegetable oils and fats.
The mixture of the two gives an amber coloured liquid at normal tropical temperatures. Some separation of the solid components may take place below 15oC but re-dissolves when the temperature is raised.
Hazards: Presents no special hazards.
F.P. > 140oF
Storage and Handling
Store under normal, cool warehouse conditions. Handle with normal skin and eye protection as for surfactants.
This product is approved under The Control of Pesticides Regulations 1986 (U.K.) for use as directed. HSE No. 5393