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http://dx.doi.org/10.5656/KSAE.2022.05.0.032

Developmental Characteristics of Zophobas atratus (Coleoptera: Tenebrionidae) at Varing Temperatures  

Kwak, Kyu-Won (Department of Agricultural Biology, National Institute of Agricultural Sciences, RDA)
Kim, Sun Young (Department of Agricultural Biology, National Institute of Agricultural Sciences, RDA)
Lee, Kyeong Yong (Department of Agricultural Biology, National Institute of Agricultural Sciences, RDA)
Yoon, Hyung Joo (Department of Agricultural Biology, National Institute of Agricultural Sciences, RDA)
Publication Information
Korean journal of applied entomology / v.61, no.2, 2022 , pp. 357-368 More about this Journal
Abstract
We investigated the developmental characteristics of super mealworm (Coleoptera: Tenebrionidae) at four different temperatures (25℃, 27℃, 30℃, and 33℃). The rearing conditions were 9L/15D, 65% RH, and 1,330 to 1,800 lux with wheat bran. The length of developmental period of 1 to 18 instars at each temperature showed that 30℃ was the shortest at 120.0±5.8 days, compared to that at 27℃ (132.6±10.7 days), 33℃ (136.5±9.2 days), and 25℃ (156.7±7.5 days). The larval developmental period was statistically significantly longer at 25℃, 27℃, and 30℃ compared to the length at 33℃. However, the death rate of larvae at 33℃ was 2.7-3.3 times higher than the rate at other temperatures. Body weight was heaviest at 30℃ followed by 27℃, 33℃, and 25℃. The patterns of head capsule, body capsule, and body length were similar to that of body weight. Regression analyses of developmental period, larval body weight, and length according to temperature revealed 29-30℃ as the most suitable temperature. The prepupa rate was 43.1% in 17 instars, 30.3% in 18 instars, 15.4% in 16 instars, 7.1% in 19 instars, 2.2% in 15 instars, and 1.9% in 20 instars, accounting for 88.8% in 16-18 instars. Prepupal period was longer at lower temperatures. For the average prepupal period of 15-18 instars, prepupa time was 18.8±1.9 days at 27℃, 18.8±2.3 days at 30℃, 23.0±2.4 days at 33℃, and 23.1±2.9 days at 25℃. The average pupal period of females and males was 11.1±2.2 and 11.6±2.4 days, respectively. The data indicate that the most suitable rearing temperature of super mealworm was 30℃.
Keywords
Super mealworm; Temperature; Development characteristics;
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