A change of vision in the edges of fencings
Traditionally usually one thinks to the borduras of the lots as sources of insects and weeds, reason why the same practices of handling are applied that in the rest of the lot. In Expo Syngenta Camet, Ing. Santiago Poggio (FAUBA and CONICET) explained: these areas are only a source of weeds or plagues in the measurement that are handled as an agricultural lot. If we pulverized the margins with weed killers and insecticides, which we are going to do is to outside perpetuate the problems of the lot, even with the possibility of generating resistant insects and weeds.
There are species that have much capacity of dispersion, as for example the black branch, that disperses by wind and has very small seeds adapted to fly long distances. It is by that it is considered that in the same way to continue handling the margins that the lots, are favored to perpetuate the problems of weeds. On the other hand, the presence is known that these practices reduce the set of species, increasing of which tolerates or resists the chemical control. By means of these free strips of applications, in addition to allowing the presence of susceptible species, it is hoped to increase to the presence of grass and dicotiled³neas that compete with the weeds, reducing his presence.
If we left an agricultural lot or a margin, stopping to cultivate it or stopping applying weed killers, which begins to see is that at the outset there are weeds of annual cycle, but insofar as it stops having anthropic disturbances, they begin to install other present species in the landscape, and begin to diminish the abundance of weeds, or the species that we recognize as weeds, it maintained Poggio.
The studies showed that in an area that is proportionally small in the landscape and that occupies from the one to 10% of the surface - associated generally to the fencings, the margins of the culture, the embankments of the railroad or edges of ways maintain an important part of the biodiversity that is wanted to conserve. Near the 70 to 80% of the present flora in these landscapes she is associate to spaces that are not cultivated. Also entomofauna, that is the fauna of insects, is represented in those spaces.
All the species are not plagues or weeds of agriculture. One of the things that we know of the margins is that they also provide with accomodations insects herbivores. The plagues of the cultures are herbivorous, that is to say, the worked plants eat, but also we found neutral herbivores, that they do not eat the cultures and they do not generate problems for the farmers. These are depredated by species that also eat to the insects plagues, and are an alternative food as well. When having that alternative food stays the population of predators. Then, when we go to the edges of ways and fencings and registered the vegetation and the communities of insects, we found that she is very rich in species and she is very rich in ecological functions as the regulation of insects plagues, pollination, etc. By all this it has much value, since in spite of being a very small area it maintains a very important part of the biodiversity concluded Poggio.