ارزیابی پارامترهای جمعیتی نسل زمستانگذران پروانه برگخوار سفید بلوط Leucoma wiltshirei Collentte (Lep.: Erebidae) در شرایط صحرائی، مطالعه موردی با استفاده از شیوه Bootstrap-match

Considerable attentions have been devoted to Leucoma wiltshirei Collenette (Lep.: Erebidae) for its destructive outbreak in oak forests of Zagros Mountain, Iran. Second larvae of this pest spend an extended dormancy period and ignoring this duration will result in unrealistic estimation of population parameters. Accordingly, we applied a bootstrap-match technique to estimate population parameters of overwintering generation of this destructive pest. The experiments were conducted under natural field conditions at oak forests of Basht county (30° 32ʺ N, 51° 29ʺ E, 744 m.a.s.l.), Kohgiluyeh and Boyer-Ahmad province. Fifty same-aged overwintering larvae (2nd instar) were individually transferred on an oak branch (50 cm length); surrounded with a two-layer mesh bag. The individuals were monitored every other day and their development as well as survivorship were carefully checked until adult emergence. Adult moths (male and female) were paired and each couple placed into a mesh bag on an oak branch. Fecundity of female moths as well as survivorship of adult individuals were daily recorded until the death of all individuals. The value estimated for Gross Reproductive Rates (GRR) was estimated as 111.05 (female offspring). The Net Reproductive Rate (NRR [R0]) was calculated as 76.15 (female offspring). The intrinsic (r) and finite rates (λ) of increase were equal to 0.0183 and 1.018 (day -1), respectively. A time period of 223.84 (day) was estimated for the mean generation time (T) of overwintering generation of L. wiltshirei. Utilizing bootstrap-match life tables that included the overwintering duration generated more realistic population parameters and could help us to develop appropriate strategies for sustainable management of this destructive pest.