The pine processionary is the main defoliator of Atlas cedar in the National Park of Chréa. To study the dynamics of these defoliator infestations, a count of winter nests was systematically conducted between 2011 and 2014 in two altitudinal ranges. The first (1000-1200 meters) contains a mixed plantation of cedar and the second (1200-1400 meters) is the pure cedar forest. The number of nests recorded in both classes is 5580 with an average of 7 nests per tree. At altitude, infestations are severe with an average of 8 nests per tree. The culmination is recorded in 2012. South and East directions are environmentally strategic sites for the location of winter nests. Despite the interannual variations, the levels of larval populations remained high. The quality of the host plant and climate change could jointly increased attacks of processionary in cedar forest.
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