The Sensus Trap is used in the capturing of Fruit flies (Ceratitis capitata & Ceratitis rosa). The Sensus Trap consists of three (3) main parts (a blue lid, a transparent Sensus cup and a wire), which fit into each other. The semiochemical lure is attached to the inside of the lid. A dichlorvos block is placed into the hollow portion of the stem of the blue lid. It releases a gas that will kill the insects upon entering. Use the supplied wire to hang the Sensus Trap in the orchard.
The semiochemical-impregnated sponge in a red-coloured capsule used to attract the Fruit flies that go into the trap is known as the Capilure. The Capilure needs to be replaced every six to eight (6 – 8) weeks. Any extra Capilures should be kept in their individual packaging in a fridge in order to prolong their shelf life before use.
How, where and when to hang traps
- How: Hang the trap at a height of 1 -2m above ground level. This will allow for maximum airflow, to distribute the semiochemical molecules (which are heavier than air) across the orchard. Hang the trap out of the way of farm implements, the direct reach of spray machines and irrigation systems, as well as away from roads, as the dust will cover the sticky liner and dry out the glue. Secure the trap firmly to the pole/stand/tree so that it does not sway in the wind. Identify each trap by a trap/ block number for later reference.
- Where: A map or layout of the field/orchard will assist in the correct placing of traps. In fields/orchards with uniform topography, size and windbreaks, hang traps at a density of 1 trap per 1 – 2ha. This is the maximum area that can be monitored by a single trap. A higher trap density may be necessary in unevenly shaped fields/orchards, fields/orchards with an excessive slope, hollows or where the prevailing wind may otherwise adversely affect trap catches.
- When: Tree crops: at beginning of production season.
Field crops: one week before germination or transplant date.
Inspection and maintenance of traps
- Inspection: The traps should be inspected weekly on the same day of each week (7-day intervals). The number of Fruit flies caught in the trap, together with the trap number and date needs to be recorded.
- Maintenance: The trap bucket needs to be cleaned on a regular basis even if no flies have been caught. The trap bucket tends to get clogged with dust, by-catch and other foreign matter over time.
Disposal of lures
Capilures need to be replaced every six to eight (6 – 8) weeks. Used Capilures can be disposed of in the garbage. No special precautions are required as Capilure is considered of no concern to human and environmental health. The dichlorvos block needs to be disposed of according to local regulations for disposal of hazardous waste.
- Capilure is sold in individual packaging at 2 per pack.
- Dichlorvos blocks are sold in foil pouches at 2 per pack.