논문 상세보기
pp.541-546
The egg size and weight of the gray field slug, Deroceras reticulatum Müller, was 1.91×2.19 ㎜ and 3.3 ㎎ at 24℃, respectively. Its weight increased from newly laid eggs to adults for 17 weeks at four temperature regimes and was heaviest at 20℃, followed by 24, 16 and 28℃. Likewise, hatching rate of the egg batches was highest with 95% at 20℃, followed by 24, 16 and 28℃ with significant differences. The number of eggs in the batches was increased with 20 at 20℃ while it was only 10 at 28℃. The average accumulated egg-laying days was longest with 15 days at 20℃ while shortest with 9 days at 24℃. The range of egg-laying period was shortest with 84-134 days at 16℃ and longest at 20℃. Thus, the total number of eggs laid by adult D. reticulatum was highest with 217 at 20℃ and lowest with 105 at 16℃. The egg period was 12-19 days while the juvenile period and adult longevity were 51-68 days and 85-134 days, respectively. The life span of D. reticulatum from egg to adult was longest with 216 days at 20℃, followed by 193 days at 24℃, 170 days at 16℃ and 151 days at 28℃. Accordingly, the most favorable temperature for the oviposition, development and longevity of D. reticulatum is 20℃.
