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Sweet cherries are not only interesting for people as a tasty fruit; The cherry fruit fly also feeds on the juice of the fruit and even lays its eggs in it. As a result, the cherries become inedible and the harvest can be significantly damaged. You can use yellow traps, which you can also make yourself, to fight.
Damage to cherry fruit flies
The cherry fruit fly is about 4 mm in size and has a striking dark, on camouflage-like drawing on the wings. In the middle of the body I also have a yellow segment. Mostly from May to June the flies are active and lay their eggs just below the surface of the ripening fruit. These are not yet fully grown at the time, but are just changing their color from green to yellow. In the cherries, maggots hatch from the eggs, which eat the fruit from the inside out. Quickly the infected fruits wither; they lose the shine, appear soft or really mushy and rot on the tree. Often, the cherries then fall to the ground, where the maggots leave the fruit and burrow into the ground until next year. The maggots themselves are up to 6 mm long and can be partially found in the infested fruits.
Prevent the cherry fruit fly
A good way to avoid the infection of the cherry fruit fly from the outset is the preference of early maturing varieties. Since the fly does not start laying eggs until May and is fixed on yellow fruits, varieties that have already ripened and turned red at this time are spared. Even tight meshes that wrap trees around you are an effective barrier. This shielding is also necessary only during the phase of re-coloring the fruits. If individual cherries have been attacked, then you should quickly remove them from the garden and destroy them - so do not give on the compost. The maggots of the cherry fruit fly overwinter in the upper layer of soil in the soil. If you loosen them in the fall, you can cause the maggots to freeze in winter, as the frost can better penetrate the loosened soil.
At harvest time, you can also apply foil and nets under the trees. This prevents the larvae from penetrating the soil. Chemical agents for controlling flies are currently not approved for hobby gardeners. Only certain adhesive traps are available commercially, which attract the flies and stick when trying to lay eggs. But you can also make these yourself.
Make a trap for cherry fruit flies
You can take advantage of the fact that the flies are focused on yellow fruits, ie on cherries that are not yet ripe. Orient yourself on the example of the trade. This offers traps made of yellow cardboard and coated with a glue to which the animals are caught.
- Use either yellow cardboard or stick cardboard strips with yellow paper.
- The color of the surface should be as bright as possible, so choose a strong coloration.
- They individual stripes should be about five inches wide and 20 inches long.
- First glue three strips together at one end so that the strips overlap one another.
- The other ends of the stiffeners do not overlap.
- Make a knot in the string and thread it through a hole through the glued strips.
- Knit the cord together again after about 7 cm and then run the other ends of the strips over each other.
- The result is a spherical structure reminiscent of a large yellow cherry remotely.
- You can then coat the surfaces of this faux-cherry with slow-drying adhesives.
- Well suited are two-component adhesive or dispersion adhesive. Ask at the hardware store for suitable coatings.
- The traps should be renewed after one to two days, because then the glue has dried and can no longer hold flies.
- You should hang about three traps per meter of tree height.
Worth knowing too Cherry fruit fly briefly
The worm in the cherry is the larva of the cherry fruit fly. In recent years, an increased incidence of cherry fly has been observed. On some untreated trees over 90 percent of the cherries were madig. The female flies lay their eggs in the growing cherries (see also cherry tree), in which the maggots develop. Infested fruits are dull and often fall prematurely. What can be done against the cherry fruit fly?
- Yellow traps: As oviposition takes place at the time of the yellowing of the fruits, yellow traps (type Rebell®) can be used for flight monitoring and mass catching. One flight per cherry variety is sufficient for the flight monitoring, whereas for the mass harvesting about 8-10 glutinous cherry fruit fly traps per high stem tree are necessary.
- liquid fertilizerIn order to improve the catch rate of the traps, PET bottles with biological liquid fertilizer (e.g., Lysodin Algafert) may be placed under the traps. The liquid fertilizer attracts the flies because of its smell, so that about twice as many flies are caught with baited traps.
- Baumscheibe networks: As an additional option, the cover of the tree grate can be used with close-meshed nets. The mesh size should be 0.8 mm, the edges of the mesh should be weighted or digged in. The nets prevent the flies, which hatch from hatching in the ground pupae, to reach the cherries. The minimum distance to cherry trees without cover should be more than 200 m.
Once infested fruit can no longer be made free of infestation, but you should pick these fruits carefully and if somehow possible, even fallen fruit not on the ground, so that the likelihood of infestation for next year is lowered. However, these measures should best be carried out throughout the neighborhood. Very early cherry varieties are not attacked because the cherry fruit flies are not yet active during their yellowing of the fruits.