Bark Thickness of Host Pine Trees and Female Body Size Affecting Ovipositional Success of Sirex nitobei Matsumura (Hymenoptera: Siricidae)

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We examined the effect of bark thickness of host trees on the ovipositional success of Sirex nitobei in relation to female body size by analyzing the relationships between female body-weight and ovipositor length and between bark thickness of P. densiflora and P. thunbergii trees and oviposition proportion (the proportion of eggs laid to the potential female lifetime fecundity) of the woodwasp. The ovipositor length ranged from 6 to 14 mm and was correlated positively with the fresh body-weight of females. The bark thickness of host trees had no significant correlation with the oviposition proportion of large females of more than 100 mg f.wt, whereas it was correlated negatively with that of small females of les s than 100 mg f.wt. Thus. P. densiflora, which has thinner bark as a whole than P. thunbergii, may be more suitable for oviposition. especially for smaller females.
一般社団法人日本森林学会の論文
1998-08-16