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http://dx.doi.org/10.5656/KSAE.2022.08.0.031

Optimal Larval Density and Low Temperature Storage Conditions for Rearing of Protaetia brevitarsis (Coleoptera: Cetoniidae) using a Fermented Mulberry Sawdust-base Diet  

Ju-Rak, Lim (Sericulture and Entomology Experiment Station, Jeollabuk-do Agricultural Research and Extension Services)
Hyung-Cheol, Moon (Sericulture and Entomology Experiment Station, Jeollabuk-do Agricultural Research and Extension Services)
Na-Young, Park (Sericulture and Entomology Experiment Station, Jeollabuk-do Agricultural Research and Extension Services)
Sang-Sik, Lee (Sericulture and Entomology Experiment Station, Jeollabuk-do Agricultural Research and Extension Services)
Woong, Kim (Sericulture and Entomology Experiment Station, Jeollabuk-do Agricultural Research and Extension Services)
Chang-Hak, Choi (Sericulture and Entomology Experiment Station, Jeollabuk-do Agricultural Research and Extension Services)
Hee-Jun, Kim (Sericulture and Entomology Experiment Station, Jeollabuk-do Agricultural Research and Extension Services)
Publication Information
Korean journal of applied entomology / v.61, no.4, 2022 , pp. 555-562 More about this Journal
Abstract
We raised the white-spotted flower chafer, Protaetia brevitarsis seulensis, from the larvae stage using a fermented mulberry sawdust-base diet at 25℃ and 16:8 h light:dark photoperiod. First, we determined the optimal density of the neonate larvae to be introduced into a rearing box (543 × 363 × 188 mm). The survival rates of the larvae were higher than 80% at 90 days after rearing at 100-175 larval densities but reduced by more than 10% at 200 larval density. The larval weights at 100 to 150 larval densities were similar; however, the weights at 175 and 200 larval densities were lower than those at 100 larval densities, indicating that the rate of weight gain increased under lower density. Based on these results, we inferred that 100-150 larvae was the optimal density. Second, we investigated the storage conditions of the last instar larvae under low temperatures. Four weight groups (1.8-2.0, 2.0-2.3, 2.3-2.5, and 2.5 g) of larvae were stored at 4, 8, and 10℃, respectively. All the larvae at 4℃ died 70 days after storage, whereas 80% of the larvae survived at 8℃ 70 days after storage, indicating that high larval weight was associated with high survival rates. The adults that emerged from larvae with more than 2.3 g and stored for up to 50 days at 4℃ laid few eggs. However, the adults that emerged from all larval weight groups stored for 70 days at 8℃ and 10℃ laid several eggs successfully. Based on these results, we inferred that the last instar larvae with more than 2.3 g could be stored for 30-50 days at 8℃.
Keywords
Protaetia brevitarsis; Fermented mulberry sawdust-base diet; Rearing density; Low temperature storage condition;
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Times Cited By KSCI : 8  (Citation Analysis)
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