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Striking 20-year grasshopper declines tied to quality of prairie grasses（图）
20-year grasshopper declines tied quality prairie grasses
2020/3/13
A new study shows that grasshopper numbers have declined more than 30% in a Kansas grassland preserve over the past two decades. The results were published in the journal Proceedings of the Natio...
Development of necrotic disease and health condition of trees of selective quality in a systematically tended beech pole-stage stand
beech pole-stage stand thinnings Central Slovakia
2015/1/29
We compare the results of observations of bark necrotic disease and defoliation of beech assimilatory organs carried out in 1996 and 2000. A systematically managed, 53-year old beech pole-stage stand ...