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The black locust trees from the Covasna resort spa’s parks are losing their aesthetic value because of their foliage is attacked by the larvae of two leaf miner species, Parectopa robinella Clemens and Phyllonorycter robiniella Clemens. The attack of this species begins in June-July and persists until the end of September. In the last three years the attack frequency produced by these species is increasing. So in 2008 the attack frequency was 9,2 % in 2010 has reached 18,8%. The same trend is reported also for the attack intensity, increasing annually the mines reported on a leaf. The number of mines/leaf for Phyllonorycter robiniella Clemens rise from 2,9 in the year 2008 to 3,7 mines/leaf in the year 2010; and for Parectopa robiniella Clemens it lowered from 2,3 mines/leaf in 2008 to 2,1 mines/leaf in the year 2010.

Studies Regarding the Attack Dynamics of The Black Locust Leafminers in Covasna’s Public Parks