Figure 2.
Occurrence of Adelges laricis on Larix decidua. (a) Population dynamics of A. laricis on L. decidua (mean number of adelgids per larch twig ± SE; n = 25); (b) Population structure of A. laricis on L. decidua. ESF—exulis sistens females at dwarf stem base; EPC—exulis progrediens crawlers (1st instar mobile nymphs) on needles; EPW—exulis progrediens ‘woolly’ sessile nymphs or adults on needles; SW—winged sexsuparae.; n = 25. (c) Total rainfall and mean temperatures in Zielona Góra in 2011. Arabic numerals denote the 10-day period of a month (I—1–10; II—11–20; III—21–30/31); Arabic numerals in parentheses denote the month (IV—April; V—May; VI—June) (data from IMGW PIB—Instytut Meteorologii i Gospodarki Wodnej, Państwowy Instytut Badawczy = Institute of Meteorology and Water Management, National Research Institute; Podleśna 61, 01-673 Warszawa, Poland).