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Coleoptera of the vine
There are many beetles on the vine, some of them cause very serious damage, and their control must be carried out with determination and speed, to prevent the plants from suffering excessively and bringing a poor and poor quality harvest to maturity. Other parasites, on the other hand, tend not to produce excessively numerous generations, and their damage is almost exclusively "aesthetic", which does not affect the productivity of the entire plant.
The fight against many of these insects is difficult, because the body repaired by a rigid shell is unlikely to be damaged by the most common insecticides, unless it is possible to directly hit the insects with the chosen product. Since most of these insects have mainly a nocturnal activity, it is very difficult to practice truly effective treatments. Often the fight is carried out against larvae or eggs, or with particular cultivation treatments.
The most harmful beetles
Among the most damaging insects of this type we recall the oziorrinco, which attacks fruit and ornamental plants without distinction: the larvae are present in the soil, and devour the root system; the adults have mainly nocturnal action, and from the ground they rise on the plants, mainly consuming the buds and the young leaves. The bark beetle of life is an insect that digs tunnels in the branches: the females lay their grapes in circular tunnels, dug in the knots of the twigs, especially in dry wood or in decay. The adults feed on the shoots in spring, and dig tunnels in the wood for winter shelter.
Scribe adults feed on buds and buds, which dry up; the larvae eat the roots. The rhizotropic larvae of the vine eat the thinnest and most delicate roots. Clearly only large populations cause damage to plants; the presence of some specimens is completely harmless in a vineyard, but should be checked to prevent a single adult from laying many eggs.
Less harmful beetles
Some specimens tend to produce few generations, or in any case cause minor damage, which does not encourage the farmer to treat insects. The sigaraio insect, for example, causes the rolling of the foliage, which is attacked with the saliva of the females, to form species of cigars of leaves, which remain attached to the plants. The anomalous of the vine consumes part of the leaf lamina, above all near the ribs, causing typical rosure. The beetle larvae are harmful only to those who produce young plants, because they tend to consume only the young rootlets, causing noticeable damage to the seedlings recently placed at home. These vine beetles are certainly harmful, but the conditions for which their populations become so large as to seriously damage a vineyard or a single plant rarely occur.
It is not easy to eradicate an attack by these insects, also because some larvae often survive, giving rise to adults, which reproduce in large numbers. Generally, treatments based on granular baits are practiced, to be spread on the ground, to kill the larvae, in order to avoid subsequent generations. In the case of adults already developed, many insecticidal products are effective, such as spinosad or alfamethrin, except that such products must directly strike the insect to kill it.
Since the coleopteran adults have mostly nocturnal activity, the use of systemic products, which enter the lymphatic circulation of the plant and poison the adults when they feed on the leaves of the plant, is more effective. In the case of specimens that erode the wood, regular pruning of damaged plants and dry branches is very effective. As a trap against these beetles you can use pruning wood, which is left at the foot of the plants, and burned at the end of winter, so as to remove most of the eggs laid on the dry wood.