Yangna Stem Borer, Celosterna pollinosa sulphurea Heller (Coleoptera:Cerambycidae): Censity and Spatial Distribution Pattern of Oviposition Markings

Abstract

Density and spatial distribution pattern of oviposition markings of Yangna stem borer, Celosterna pollinosa sulphurea Heller were investigated in pure and mixed stands of Dipterocarpus alatus Roxb. and Anisoptera costata Korth. in the Huai Tha Experimental Station, Srisaket province in 1995. The density of oviposition markings was highest in the pure stands of A. costata. The densities in the pure stands planted 4x4 m were 5 to 10 times higher than those in the mixed one planted in 8x8 m. The spatial distribution patterns of oviposition markings were contagious in the pure stands, while they were random in the mixed. In the multistorey mixed stands, the densities were 5-8 times higher in the thinning plots than in the non-thinning plot.