During the hottest months of the year, it is usual to observe signs of intervention in the green areas of cities, with the purpose of controlling pests that affect both vegetation and animals. Among these measurements, an image that can cause some strangeness is the presence of a black bag hanging from a tree. Although it seems simple, this method has an important role in combating a recurring threat.
Hanging black bag
In various regions, both in Portugal and other points in Europe, especially with the arrival of hot weather, it is common to see black bags placed around the trees. These objects act as natural traps and are a solution to control the oak caterpillar, a species that becomes particularly active at this time.
Its presence in gardens and parks has been growing, leading to the need for containment measures that do not compromise the environment. Contact with these caterpillars can be harmful to people, animals and plants, reinforcing the importance of maintaining distance from these zones, according to the news work.
These bags should not be removed. Its installation and conservation are the responsibility of specialized teams. Circulating near the trees with these traps should also be avoided for safety reasons.
How this trap works
This trap consists of a black bag with an opening through which the caterpillars enter, attracted by Pheromonas. Inside, there is a dark chamber where insects are stuck.
Solar energy heats the interior of the bag, causing the drying of caterpillars without the need for chemicals, according to the same source. Thus, it is avoided the use of pesticides, which can harm other life forms and the ecosystem itself.
To reinforce their efficiency, the traps are often filled with sand, preventing the wind from moving them or damaging them.
The risks associated with the oak caterpillar
This caterpillar has microscopic with irritating properties. Direct skin contact can cause allergic reactions, itching, redness and, in more severe situations, breathing difficulties if they are inhaled.
These symptoms do not only affect people. Company animals, such as dogs, may suffer serious consequences when inhaling or touching them during the tours.
In case of accidental contact, as the same source refers, it is advisable to wash the skin well, hair and clothing. If symptoms persist, medical support should be sought.
Examples of measures in other countries
In cities like Colonia, Germany, this plague has significantly affected green spaces. Authorities have implemented joint strategies, including fumigations on public roads and these traps.
Collaboration between municipal services, environmental technicians and population has been fundamental to try to reduce the damage caused by the caterpillar.
Advantages of ecological methods
The use of traps like black bags represents an ecological alternative to pesticides. Thus, the contamination of soil, water and the destruction of other species is avoided, as referred to in the same source.
The adoption of natural solutions favors the protection of public health, while retaining urban ecosystems. When avoiding toxic substances, it also increases the safety of those who go to parks and gardens, whether adults, children or animals.
The role of sensitization and prevention
Clear information and conscientialization of the population are key elements for the success of these initiatives. Knowing how to recognize the signs of the presence of the caterpillar and respect the intervention areas contributes to avoid accidents, according to the.
It is also responsible for local entities to ensure adequate communication on dangers and care to be taken.
Regular monitoring allows you to identify infestation outbreaks and intervene quickly. With a coordinated performance, it may be possible to reduce the impact of this seasonal pest and protect the green spaces that are part of our daily lives.
As a matter of curiosity, be aware that the oak caterpillar belongs to the process Thaumetopea processed, known for moving in organized lines, as if they were in a procession, behavior that gave it the common name. This standard of motion facilitates its identification by those who go to green spaces.
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