PRELIMINARIES RESEARCH CONCERNING LYMANTRIA DISPAR DEFOLIATOR PRESENT IN THE BEECH FORESTS

The gradations appearance of Lymantria dispar in the beech forests, belonging different areas of our country (DS. Tr. Severin, DS. Resita , DS. Baia Mare, DS. Satu Mare.) is required effectuation of some researches considering biology, the forecast and struggle this defoliator. The preliminary result presented in girlish paper is adverted to aspects connected with the settlement numbers criticisms for beeches species, because hereto date the forecast is established using the criticisms numbers from oaks species. Was made individual grow to cankerworms with the fresh leafs, which offered the possibility to observe the daily feeding rate, on ages, larva’s and sexes. Was consisted as the female larva, to arrived at the maturity need the precinct 35-45 days with an average consumption of 639 cmp (precinct 25-30 mature leafs), and the males arrive at the maturity in 28-35 days, consuming 200 cmp (respectively 5-7 mature leafs). The economic importance of the rammels of beeches requires the continuation of researches in the determination sight of criticisms numbers, for the settlement corrects the forecast.

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