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Tentredini: what they are and how to eliminate them

Tentredini: what they are and how to eliminate them


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They resemble wasps when they are adults while if they are still in the state of larva they are easy to recognize because they are much shorter than a caterpillar. It is about the Tentredini, insects that affect some plants in crops but also in our gardens if we host fruit trees. These enemies are capable of doing a lot of damage and are unfortunately widespread worldwide, except in Antarctica, where it is probably difficult to cultivate the plants that are victims of it, but also in New Zealand while in Australia the presence of these beings has been recorded but very occasionally attacks are seen. It is strange to know that the Tentredini are so widespread because they do not have a great ability to expand between one area and another since they are not insects with a body suitable for flying long distances and are concentrated above all where the plants they are fond of are grown.

Tentredini: what they are

Let's take a closer look at these insects. They are a family that belongs to the order of the Hymenoptera, an order to which the subclass Pterygota e, which seems to be the only one in the Hymenopteroidea section, which includes beyond 120,000 species spread all over the world. The term hymenoptera derives from the ancient Greek and refers to the membranous wings that these insects sport, including Tentredini.

In addition to being widespread all over the world, this family of insects has been in the world for a long time and it can be understood from the fact that fossil testimonies have been found that date back even to the lower Cretaceous. Let's find out what it looks like. We have said that when this insect becomes an adult in the eyes of someone who has never had to fight it, it looks a lot like a wasp that buzzes around our plants with dimensions that can vary between 2 and a half centimeters and a half centimeters. Its abdomen is sessile and separated from the thorax, filiform antennae depart from the head but composed of nine flagellomeres and a saw-shaped ovipositor

The larvae of this insect have a completely different appearance but are easier to recognize. I'm eruciform with the abdomen divided into ten segments and pseudopods, usually seven or eight pairs, and compared to a caterpillar it is different because the latter never has more than five pairs of pseudopods. The count is almost microscopic but it allows us to recognize the larvae to be eliminated because they are quite harmful.

Tentredini of pear and Tentredini of plums

Usually when you hear about this family of insects, it is a problem that affects some specific types of trees such as the pear and the plum tree. Not all sawflies are harmful to plants that bear fruit but it is precisely those that are that alarm us starting from the pear's sawflies and the plum's sawdrops. In the first case the scientific name is Hoplocampa brevis and it describes an animal that lays its eggs in the flowers of pear trees and when the larvae are born they voraciously feed on the fruits. The same happens with the apple tree, which is also a victim of these wasp-like.

In the case of Tentredine of plums we have to talk about Hoplocampa minuta, an insect that damages all the fruits creating real disasters in the plantations of those who grow them. You have to imagine some little creatures that manage to dig tiny tunnels inside the fruit even when they are not yet ripe, until they reach the still soft endocarp and go further, devouring both the pulp and the endocarp itself. As you can imagine, the affected fruits are to be thrown away and often detach from the plant prematurely or rot or mold but they are certainly not edible.

Other plants affected are, for example, turnips, from the athalia colibri that feeds on their leaves, and then there are the sawflies of the vine shoots, from the scientific name of Emphytus cinctus, which lay eggs on the young branches of the vine, leaving it to the larvae to destroy them.

In general the larva of these insects is phytophagous and when it attacks the leaves it has the habit of wrapping the body on both sides, it feeds on them like a caterpillar, positioning itself on the outside. In some cases, but rare, the larva enters inside a gall or digs tunnels in the parenchyma of the leaves, or even inside the fruits. .

Tentredini of the shoots

We can find this insect also intent on annoy the shoots and he can do it as an adult, above all, when he loves to feed on nectar. Fortunately, there is only one generation per year of sawflies that overwinter in the form of pupa in the ground or in other sheltered places,

Tentredini: prevention

To try to prevent a sawfly attack it is necessary to pay close attention to your garden to recognize the larvae. To do this you need to check the leaves in the months of April and May and if you find anything suspicious, eliminate them promptly! We must make sure that on our trees there are no leaves with parasite eggs or already with the parasite in the larval stage.

Tentredini: how to eliminate them

To hunt the Tentredini of plums and the sawflies in general we can choose chemical or agronomic methods. In this last case, adults are sampled for a subsequent chemical fight through the installation of chromotropic traps before the flowering of our trees begins. When the flowers lose their petals and the fruit begins to grow, we intervene with the application of chemicals that are usually larvicides that cover almost the entire population living in that period. On Amazon we can also find interesting and effective specific products such as Solabiol Piretro Actigreen Bio



Video: PIRETRO INSETTICIDA NATURALE (June 2022).