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Walnut Husk Fly

Rhagoletis Completa

With its black spotted creamy coloured appearance, and with its transparent wings with dark strips, the walnut husk fly is an easily recognisable dipteran.

Each female can lay up to 400 eggs inside a walnut husk that she has marked with a particular pheromone to inhibit other specimens from depositing eggs. Once hatched, the larvae take their nutrition from inside the husk for 3-5 weeks, causing a darkening of the husk, which gradually covers all the fruit.

(Photo: @syrio - Wikipedia)

The traps that can help you are

Use the following recipes

FRUIT FLIES and MEDITERRANEAN FRUIT FLIES (cherry, citrus, walnut, olive orchards, etc.) - Tap Trap

Pour into the bottle ½ litre of liquid ammonia (the one used for cleaning, with no added scent) and add some raw fish scraps (such sardines, anchovies or similar).

The bait is ready (as ammonia comes already diluted in the right amount of 5%.)
 

 
FRUIT FLIES and MEDITERRANEAN FRUIT FLIES (cherry, citrus, walnut, olive orchards etc.) - Vaso Trap

Pour into the jar 350 ml of liquid ammonia (the one used for cleaning, with no added scent) and add some raw fish scraps (such sardines, anchovies or similar).

The bait is ready (as ammonia comes already diluted in the right amount of 5%.)

 
SFERA TRAP

After inserting the two 1.5V AA batteries (not included), insert the luminaire into its seat inside one of the semispheres. Sfera Trap is now ready to be assembled - How to do it

 

Before applying the glue, wrap the sphere with a transparent plastic film (such as cling film, or two clear shower cups); then apply a suitable glue.

In the event of loss of adhesion, the glue can be reapplied several times.

 

In addition to using only glue, or glue and attractants on it, Sfera Trap can also support insecticides and pheromones.

 

Practical advice: Use disposable gloves in the preparation of the sphere and the various products used. To avoid damage from possible spillage of glue, place a protective sheet underneath the sphere, such as cardboard or paper. In the eventuality of glue spillages these can be removed using white spirit or turpentine - How to do it