Charakterystyka zmian liczebności larw strzygoni choinówki (Panolis flammea Den. et Schiff.) na podstawie opadu ekskrementów, w wybranych drzewostanach Nadleśnictwa Tuczno, w latach 1999 - 2002

This paper synthesizes results from the study on abundances of pine beauty moth (Panolis flammea Den. et Schiff.) larvae in selected stands of the Tuczno Forest District conducted in the years 1999−2002. Observation of frass fall onto dispensers set beneath tree crowns was the method to assess larvae abundance. The purpose was to assess the level of infestation of stands by larvae, as well as the rates of growth and development of larvae. Obtained results indicated the occurrence of pine beauty moth larvae almost in every fragment of the studied stands with densities of larvae in crowns changing from year to year. The year 2001 saw the greatest increase in larvae abundance. Observations showed that in 2001, the development and growth rates of larvae differed from those in 2002. The occurrence of larvae in centres, which is typical for the period between outbreaks, continued.