• Nathapong Matintarangson -


Parasitism, Sex ratio, Insect parasitoids, Maize weevil


             The aim of this study was to evaluate the impact of percentage parasitism, quantity of progeny, and sex ratio on the fourth larval instar of the maize weevil in Anisopteromalus calandrae (Howard), Theocolax elegans (Westwood), and A. calandrae + T. elegans. Complete randomization (CRD) was used in the arrangement of the studies. Five pairs of male and female A. calandrae, T. elegans, and A. calandrae + T. elegans (1:1) were released into glass vials containing maize seeds and the larvae of the maize weevil.The result showed that the parasitism, the number of progeny and sex ratio of A. calandrae were significantly higher (p<0.05) than those of T. elegans and A. calandrae + T. elegans. A. calandrae exhibited the highest parasitism at 74.38%, 42.60+2.82 and 1:1.81, followed by T. elegans with 58.62%, 27.60+2.20 and 1:1.39, in terms of parasitism, progeny, and sex ratio. Whereas the parasitism, progeny count, and sex ratio of A. calandrae + T. elegans were 32.24%, 18.20+1.46, and 1:1.22, respectively.


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บทความวิจัย (Research Article)