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Man has always tried to control nature and to take possession of its resources; at first he did it in a prudent way, taking care only of his maintenance, but then he did it in a wrong way because of the insistent requests of global market.
The upheaval of the old and respectful relationship between man and land has caused serious and irreparable consequences.
This article wants to analyze and to understand some causes of this break, and the effects of the diffusion of phitopathogen agents in agriculture: the Xylella fastidiosa bacteria in the vineyards of California before, and then in the olive groves in Puglia (Italy) the insect Dryocosmus Kuriphilus which has damaged the chestnut trees in Italy, the cedar apple rust, which attacked the apple trees in Virginia, the Moniliophthore roreri which attacked the cocoa production in Latin America.The most important matter is that these threats and their effects are unforeseeable and they can’t be solved through isolated actions, but only with the integration of different strategies, using the instruments of the scientific research and the Knowledge, with a traditional planning.
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