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Anti tiger gnat Treatment



TIGER GNAT – Aedes albopictus

Its name comes from the external aspect, as it’s black with transversal white strips on its legs and on its paunch. Thanks to its versatility, the tiger gnat was able to cross great environmental barriers becoming in a few years a grave environmental and sanitary danger. It comes originally from southern and eastern Asia. It reached before the USA and the southern America, then probably Europe because of the import of used tyres.

Its diffusion s typically of urban kind and you can difficulty find it in the countryside. Its eggs are laid in small puddles (manhole, backwater) and in the proximity of Winter (resistance eggs) in dry and quite dark places. These places, with the rise of temperatures, near Spring, become full of backwater. In Italy you can find it as an adult insect from March to November, but the laying of the winter eggs comes to an end within the end of October. During the warmest months, when the temperatures are around 25°C, the tiger gnat is able to complete its development in less than 10 days. Its diffusion has got a discontinuous and patchy flow. The tiger gnat is a very aggressive insect and it’s dangerous during the day, especially in the morning and in outside places. It rests during the nighttime on the vegetation, its sound during the fly is almost imperceptible, unlike the common gnat: its biting system is extremely hardy and it can goes beyond clothes. Only the female gnat bites because it requires proteins (present in the human blood and in that of some animals) to ripen its eggs. It picks on ankles and legs causing bothering swellings whose cause it the saliva of the insect.

LA LOTTA :

Its diffusion s typically of urban kind and you can difficulty find it in the countryside. Its eggs are laid in small puddles (manhole, backwater) and in the proximity of Winter (resistance eggs) in dry and quite dark places. These places, with the rise of temperatures, near Spring, become full of backwater. In Italy you can find it as an adult insect from March to November, but the laying of the winter eggs comes to an end within the end of October. During the warmest months, when the temperatures are around 25°C, the tiger gnat is able to complete its development in less than 10 days. Its diffusion has got a discontinuous and patchy flow. The tiger gnat is a very aggressive insect and it’s dangerous during the day, especially in the morning and in outside places. It rests during the nighttime on the vegetation, its sound during the fly is almost imperceptible, unlike the common gnat: its biting system is extremely hardy and it can goes beyond clothes. Only the female gnat bites because it requires proteins (present in the human blood and in that of some animals) to ripen its eggs. It picks on ankles and legs causing bothering swellings whose cause it the saliva of the insect. To eliminate the tiger gnat and the common one you can appeal two remedies:

PRE-EMERGENCY AND POST-EMERGENCY.

With pre-emergency we mean not to create the favorable conditions to its multiplication, for example:
- Avoid the pull-out of materials that can collect rainwater;
- Eliminate the water from flowerpot holders, watering cans, drums and any other recipient;
- In case of use, try to cover the recipients for the water collecting;
- Clean accurately the pots before throwing back home them during cold periods.

In fact, the habit of protect the plants in the inside during the winter season is probably one of the main causes that produces, once the plants are taken outside during the spring, the hatching of the eggs that eases the gnat diffusion in the environment. - Introduce in the fountains of the garden red fishes and big predators of gnat grubs; - Introduce insect repellent plants. Actually they are not very popular in Italy. Anyway the more plants you have the more will be their efficacy. - You can find in Italy a machinery with American patent that produces carbon dioxide misleading and capturing insects. Every machinery covers about 1500/1800 mq of surface withouy barriers. In particular cases you can put in the backwater 8 g/l of metal copper (electric wire without the plastic sheath), which causes a mortality rate of about 93% after two months, 96% after 3.5 months and 100% after 5 months. The copper has got a negative effect on the development of the surviving grabs. In fact we have noticed the doubling of their development time and a reduction of the adult biomass. Studies dated 1998/99 on more than 3500 flowerpot holders have underlined that the copper (about 20 gr/flowerpot holder) causes a reduction of the grabs density compared with the experiment of 94-98%. Besides, these studies noticed a great drop of the number of colonized flowerpot holders . Other studies dated 2000 have noticed that the copper puts a great strain on laying.


POST EMERGENCY

Treat every 15 days the flowerpot holders and the manholes with larvicidal products. Operate with selective disinfestations in the environment. These treatments can be realized with synthetic insecticides, called pyrethroids, which have got different features form the traditional Ddt and that are not sprayed in an indistinct way through the place, but it should be shoot in defined areas. They are watering solvent products and they kill tiger gnats, not the grabs. An intervention of this kind requires an accurate preparation, both for the location where the tiger gnats rests and for alert the population who lives in that place. It is necessary to rely on skilled companies and avoid the do-it-yourself. Contact: www.poldoservice.it The great part of the products can be divided into: killing, residual and killing/residual ones. Killing products: during the erogation of the product every insect present at the moment is killed. Residual products: the operator spray the product on the great part of surface, from the walls to the roofs, from the trees to the garden. In this way the polymerization takes place. The tiger gnat touching the wall lets the molecule explode and it’s going to die in a few hours. Killed/residual products: see above. The serviva of the molecules depends on the weather conditions. In favorable situations they can survive for about 6 weeks, but if it rains they will be washed and in temperatures over 30°C or great humidity they can explode and their life will end in a few days.

 
 
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