Effects of different diets and temperatures on larval growth of the white-spotted flower chafer, Protaetia brevitarsis (Kolbe) (Coleoptera: Scarabaeidae)

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  • ABSTRACT

    The white-spotted chafer, Protaetia brevitarsis (Coleoptera: Scarabaeidae), is an economically important insect in Korea. Traditionally, it has been regarded as a medicine for preventing liver-related diseases and suppressing liver cancer. Recently, this beetle was enlisted as a temporal food ingredient by Korean Ministry of Food and Drug Safety. Therefore, this beetle is focused as a one of the important insects that are commercially reared and sold in Korea. As the economic importance of this beetle is growing, the suitable rearing conditions are needed for more detailed investigation. In this study, we compared three temperature conditions and two food additives, rice chaff and soybean cake, for its effects on the body weight change of third instar larvae of P. brevitarsis. Temperature is a major environmental factor that has tremendous effects on rearing insects. In additions, rice chaff and soybean cake are byproducts of other agricultural activities. Therefore, it is easy to get, and the price is comparatively low. However, they still have meaningful amount of nutrients. With four different kinds of feed and three temperature conditions on the third instar larvae of beetles, the body weight change was tracked for 14 wk. We concluded that 27.5℃ is the optimal temperature to rear the third instar larvae among three temperatures (25, 27.5, and 30℃). Among four different feeds, conventional fermented oak saw dust with rice chaff and soybean cake was the best feed for larval weight gain during 14 wk. However, feed with soybean cake at 30 ℃ was the best condition for rearing P. brevitarsis larvae when temperatures and feeds were compared at the same time.


  • KEYWORD

    Protaetia brevitarsis , temperature , rice chaff , soybean cake , body weight , rearing

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  • [Table 1.] Composition of four different feeds with two feed additives ? rice chaff and soybean cake
    Composition of four different feeds with two feed additives ? rice chaff and soybean cake
  • [Fig. 1.] Means and standard errors of final larval weight after 14-week rearing on three different temperatures (25, 27.5, and 30℃). The means and standard errors were tested at 95% confidence level by Least Significant Difference (LSD) test.
    Means and standard errors of final larval weight after 14-week rearing on three different temperatures (25, 27.5, and 30℃). The means and standard errors were tested at 95% confidence level by Least Significant Difference (LSD) test.
  • [Table 2.] Results for ANOVA test with three temperatures and four feeds. Ten P. brevitarsis larvae per each treatment with three replication were analyzed for their larval weight gain for 14 wk
    Results for ANOVA test with three temperatures and four feeds. Ten P. brevitarsis larvae per each treatment with three replication were analyzed for their larval weight gain for 14 wk
  • [Fig. 2.] Means and standard errors of final larval weight after 14-wk rearing on four different feed compositions. The means and standard errors were tested at 95 % confidence level by Least Significant Difference (LSD) test.
    Means and standard errors of final larval weight after 14-wk rearing on four different feed compositions. The means and standard errors were tested at 95 % confidence level by Least Significant Difference (LSD) test.
  • [Fig. 3.] Interaction between three temperatures (25, 27.5, and 30℃) and four feed compositions on the final larval weight gain for 14-wk rearing.
    Interaction between three temperatures (25, 27.5, and 30℃) and four feed compositions on the final larval weight gain for 14-wk rearing.