Larvae of cetonia, not very welcome in the garden, because they can cause damage. To understand why, it is necessary to know better what cetonia larvae can become when large.
The golden cetonia is a beetle that belongs to the Scarabeidae family, its subfamily that of the Cetoniinae. In truth, the name that is often associated with it is "beetle", in truth it is incorrect because the real beetle is the Melolontha melolontha which is always a beetle but not the one that arises from the cetonia larvae.
The presence of Cetonia is usually noticeable when it goes in search of flower corollas. It is noticed around the cup-shaped ones, preferably, so the cetonia larvae are very fond of peony or camellia and they do not disdain the buttercup and the apple and quince flowers.
Cetonia can also target buds if they are very large flowers, like those of the rose.
Larvae of golden cetonia
The golden cetonia larvae they are rather small and do not let us imagine that this beetle can even reach 18 mm in length. Unpredictable, too its "adult" color, very metallic, often of green tones. But there are also cetonia larvae which will become bronze, copper, purple, blue or gray-black, sometimes also with white markings on the elytra and, occasionally, on the pronotum.
The belly part is almost always auburn in color, but there are cases where it resumes the green of the upper part. The cetonia larvae overwinter in the ground, or in rotting trunks, then they go up to the light of the sun, on the surface, towards spring, and turn into pupa. Another two weeks and then the adult beetles emerge to feed.
To produce larvae mating is necessary which allows females to lay groups of eggs (from 6 to 40). Favorite places are the debris that they gather in hollow trees, rotting wood or accumulations of organic matter. The development of cetonia larvae can last from 3 to 12 months, it also depends on the nutrient substrate and the temperature.
Larvae of cetonia: photo
It is difficult to find images of the cetonia larvae as they are also very small. It is more common for them to be immortalized as adults, with their metallic blue-emerald green armor. Approaching to photograph them is not dangerous, because as larvae or as adults, they are anyway absolutely harmless to humans.
Larvae of cetonia how to eliminate it
To delete the larvae it is good to avoid that they find where to grow, so that the females have no places where to lay their eggs near our plants. To prevent, therefore, the presence of these beetles, we can rturn the land of flower beds around November, thus the eggs are exposed to the winter cold. In February we can instead use a geodisinfestant.
To delete the cetonia larvae, instead, the best but also the most unpleasant thing is to collect them by hand. However, if the situation is serious, white or blue adhesive traps can be used, or treated the plants attacked, once a week, with natural pyrethrum (also wetting the underside of the leaves and the stems), starting 10 days before flowering and for its entire duration.
Larvae of cetonia in the vessels
For flush out the larvae in the vessels it is good to look for them near roses or other flowers but in humid areas where the females may have laid their eggs. It can help us to know that these adult beetles eat foliage, buds, flowers and fruits of blackberries, raspberries, strawberries, apricots and all sweet fruit.
Cetonia larvae in compost
As mentioned, compost is one of the substances in which the females of cetonia they are likely to lay eggs. So it's one of the first places we have to check that they're not there cetonia larvae.
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