Suppression effects of predatory bugs on the stored-product insect Tribolium confusum (Coleoptera: Tenebrionidae)
2005
Ishijima, C.(National Food Research Inst., Tsukuba, Ibaraki (Japan)) | Imamura, T. | Visarathanonth, P. | Miyanoshita, A.
The impact of two predatory bugs, Xylocoris favipes and Joppeicus paradoxus, on the stored-product insect, Tribolium confusum was examined. Five pairs of adult T confusum were placed in a plastic container (dia, 15 cm, height 8 cm) containing 10 g of whole-wheat flour. After 3 d, the following four experimental groups were set up: Control (no predator release), X. flavipes (four pairs of adult X, flavipes released), J. paradoxus (four pairs of adult J paradoxus released), and X flavipes+ J paradorus (two pairs each of X. favipes and J paradoxus released). Twenty-five days after the release of the predatory insects, we counted the number of living T. confusum, X. flavipes, and J. paradoxus. The number of T confusum in the X. flavipes-treated and J paradoxus-treated groups was 3 and 33% of the control, respectively. On the other hand, the suppressive effect of X. flavipes + J. paradoxus treatment was lower than that of the above two treatments, probably due to intraguild predation between X. favipes and J. paradoxus.
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