Bucket for Budget Bucket Moth Trap

Using a off the shelf bucket with a lid to make a moth trap is a very cost effective place to start. Here is an approach to using such a  bucket.

Components:

Bucket

We have selected an all black bucket with a good fitting lid. They are used in hydroponics and food industries. Ours is a 20 litre capacity which is nearly as wide (32cm) as it is high (34cm); we looked for one with the largest lid area.

Entrance funnel

A large (in our case 21.5cm) household funnel that we cut down by 10cm to give a 4 or 5cm gap to the top of the drainage funnel. The diameter of the bottom of the funnel can be as little as 3cm allowing large moths in while making it difficult to get back out.

Drainage funnel

An 80mm diameter powder funnel where the spout fits neatly into the drainage connector. The spout needs to be slightly smaller than the tank connector inside diameter.

Netting The funnel can trap moths and so using a piece of curtain netting, about 10cm square, jammed into the funnel spout allows water to flow, but protects the moths

Drain connector

A straight 21.5mm overflow tank connector nicely supports a funnel to catch any water ingress down the entrance funnel.

The connector needs to be cut down to avoid protruding out of the bottom of the bucket's base.

Egg boxes Collect and reuse your own egg boxes or for neater stacking larger trays can be obtained and cut down with a smooth, sharp carving knife.

Assembly

Cut hole in lid to fit entrance funnel

The entrance funnel should have a good lip so that there is no risk of the funnel falling through the circular hole in the lid. The diameter of the hole in the lid needs to be measured carefully to be very slightly greater than the outer size at the top of the sloping sides of the funnel.

For the 215mm outside rim diameter funnel we use  the hole required is 202mm.

We have a circle compass cutter to make the hole. The lid is just about thin enough (1.2mm) to cut with a Stanley knife, but difficult to control so using good kitchen scissors or snips may be best. A drawing compass or string around a drawing pin held at the centre of the lid can provide the line to cut around.

Cut hole and fit the drain connector

For the tank pipe connector we use a 28mm hole cutting drill to create a neat hole in the centre of the base of the bucket.

The nut from the drain connector can be tightened to securely hold the connector in place. If the tank connector is made from a solvent weld plastic then use a hard plastic adhesive to hold the nut in place permanently.

Six or eight , 6mm or 8mm, drainage holes should be drilled around the perimeter of the base of the bucket to allow any rain water that escapes the drainage funnel to drain away.

Fit netting into funnel spout Fold the netting up and jam it into the spout of the drainage funnel such that it doesn't come out easily.
Fit the drainage funnel When using the trap, simply place the drainage funnel into the connector. The funnel may need cutting down so that it is shorter than the pipe connector.
Fit the entrance funnel into the lid and attach your light assembly

After filling the bucket with egg boxes in a way that keeps clear of the funnels, the lid can be replaced, the entrance funnel should slot into the lid.

 

To complete the trap follow one of the two options for the light:

See how to make a compact fluorescent light for this trap

See how to make an LED light for this trap


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