Zhu Chenxu, Zhao Ming, Zhang Haibo, Zhang Fang, Du Yuzhou, Lu Mingxing
College of Horticulture and Plant Protection & Institute of Applied Entomology, Yangzhou University, Yangzhou 225009, China.
Plant Protection and Quarantine Station of Jiangsu Province, Nanjing 210009, China.
Foods. 2021 Nov 16;10(11):2820. doi: 10.3390/foods10112820.
Mell, 1922 (Lepidoptera, Sphingidae), also known as "Doudan" in China, is an important pest in legume crops. As an edible insect, it is most commonly consumed in Jiangsu, Shandong, and Henan Provinces. Mass rearing requires access to large numbers of eggs. This stage, however, is of short duration and supplies are frequently not sufficient for insect production. Therefore, we identified the cold storage conditions for that can effectively prolong the storage time of the eggs, to make supplies more readily available. We found that when stored at 4 °C, only 7.5% of the eggs hatched after 7 days, while at 10 °C the hatch rate was 78.3%. At 15 °C, the egg hatch rate remained at this same level (77.8% even after 14-20 days). Considering various combinations, we found that optimal egg hatch occurred if eggs were stored at 15 °C for 11 days, and then held at 15-20 °C under dark conditions. Stored as described above, the egg hatch rate was not significantly different from the control group (at 28 °C). These conditions allow for easier mass rearing of by providing a stable supply of eggs.
豆天蛾，1922年（鳞翅目，天蛾科），在中国也被称为“豆丹”，是豆类作物中的一种重要害虫。作为一种可食用昆虫，在江苏、山东和河南等省份最为常见。大规模饲养需要大量的卵。然而，这个阶段持续时间很短，卵的供应常常不足以满足昆虫生产的需求。因此，我们确定了能有效延长卵储存时间的冷藏条件，以使卵的供应更容易获得。我们发现，当在4℃储存时，7天后只有7.5%的卵孵化，而在10℃时孵化率为78.3%。在15℃时，即使在14 - 20天后，卵的孵化率仍保持在同一水平（77.8%）。考虑到各种组合，我们发现如果将卵在15℃储存11天，然后在黑暗条件下保持在15 - 20℃，卵的孵化效果最佳。按照上述方式储存，卵的孵化率与对照组（在28℃）没有显著差异。这些条件通过提供稳定的卵供应，使得豆天蛾的大规模饲养更加容易。
