The Oziorrinco belongs to the family of the Coleoptera Curculionidi.
The adults of this insect, just after the twilight, start moving out of the ground shelters, right at the foot of the plants (lower part of the trunk) and begin to climb up along the trunk but also along the stakes guarded to hold the new seedlings planted.
They go up slowly to the young leaves and begin to eat them quietly; in the morning at dawn they leave the plants and return to their shelters in the ground. Also the larvae are harmful: they are white, fleshy, with a yellow-red head, about 1 cm long, very recognizable as they have a typical C-shaped body. They live hidden in the ground and feed on the roots of many species and they are very harmful both to horticultural, fruit and ornamental species.
This insect causes, on the young leaves of fruit and ornamental plants, crescent-shaped erosions which, in addition to being unaesthetic (eg in ornamental plants), can be quite serious for young trees, as they limit the capacity for photosynthesis and compromise the formation of the foliage with slowing growth.
In the areas of central and southern Italy this usually appears in the month of May (starting from the hottest areas), continues in June and, after a stop in the summer period, resumes again with good incidence in the autumn period.
No to chemical fight
It is difficult to counteract adults by using insecticides, especially in cases of severe attacks, as the activity phase of this insect is very long (at least 4 months: May-June and September-October) and sometimes more species are present at the same time. Therefore one should resort to repeated spraying (for at least 15 days) and with very toxic products (phosphorganic) in a period of activity also of pollinators and pollinators.
Biological control, on the other hand, has been implemented for a long time and with considerable success.
Oziorrinco: Biological struggle
Manual collection of adults during the night: it takes place by shaking the branches and placing large sheets under the plants, the fallen and collected insects will be burned. Straw can also be used at the base of the trees, where adults spend the night: even in this case the straw will then be burned;
Ring barriers along the trunk of the trees: they are used to prevent the nocturnal ascent of the adults, by means of bands placed on the trunk to be placed immediately at the appearance of the first erosions, often eliminating the captured insects. The methods recommended here are easy to apply even as "do it yourself": a cardboard strip should be fixed at 30-40 cm from the ground on the trunk, tying it tightly with wire and brushed with natural mistletoe.
These bands should be checked periodically, as the adhesive force is nullified by dust and soil. There are bands on the market with substances that effectively replace the mistletoe (for example, TERMOSTICK and TERMOOCID of KOLLANT), non-toxic, odorless and unalterable substances available in tubes and cans depending on the use to be made of them. Unfortunately these bands are not selective or indiscriminately hit all the insects, good or bad, that are found to pass on the trunk. It is therefore advisable to leave them only as long as necessary to combat the harmful species; The WOOL RESINATE STRIPS (stuffing material used by upholsterers), hinder the insect's legs thanks to the particular structure of the synthetic wool; the insects are captured en masse.
It is suggested to use bands of at least 15 cm in width, with an outermost external surface, to hinder more the ascent, tying them to the trunk and to the stakes with elastic laces to avoid bottlenecks. The cost is really very low (Lit. 10,000 / kg) and with 1 kg it is possible to treat about 100 young plants.
This technique can be used both for fruit trees and ornamental plants. This is for ADULTS. For the LARVE, living in the soil, the subject is completely different: we use, especially for intensive crops, products based on NEMATODI (Steinernema carpocapsae or Heterorhabditis megidis and Heterorhabditis heliothidis). These nematodes (eg LARVANEM) kill the larvae in the soil, especially if it is sandy or of medium texture (the displacement of the nematodes in clay soil is rather difficult).
They work with temperatures between 15 and 30 ° C, in conditions of high soil moisture.
Treatments can be carried out with normal spraying equipment but also with fertigation, early in the morning or in the late afternoon to limit the exposure of nematodes to ultraviolet rays as much as possible.