Biology of Copidosoma subalbicornis (Nees) and its natural parasitism on peach twig borer Anarsia lineatella Zeller in almond orchards of Chahar Mahal va Bakhtiari province

Biology and natural parasitism of Copidosoma subalbicornis parasitoid wasp of A. lineatella was evaluated in almond and peach orchards of Chahar Mahal va Bakhtiari province in 2016-2017. Parasitism and the presence of parasitoid wasp in nature, host preference and life span of parasitoid wasp and the pest were evaluated at laboratory conditions. Results showed that maximum parasitism percentage of third generation larvae was 26.5±2.22 and 27.1±3.11 in Emamieh and minimum was 18±1.18 and 17.9±2.37% in Saman and Cham Ali almond Mamaei cultivar orchards in 2016 and 2017, respectively. The rate of parasitism of peach twig borer larvae in the first and second generation was 13.3 and 16% in Saman city in 2016, respectively, and in 2017 was 13.9 and 15.5%. C. subalbicornis could parasitize the all larval instars of the pest during three generations, however, last instar larvae were preferred.