Impact of Variegated Temperature, CO<SUB>2</SUB>and Relative Humidity on Survival and Development of Beet Armyworm <i>Spodoptera exigua</i>(Hubner) under Controlled Growth Chamber

• 作者: Jagdish Jaba Naveen Arora Rajendra Munghate Suraj Prashad Mishra
• 来源期刊: 美国气候变化期刊(英文)
• 学科: 数学
• 关键词: Spodoptera exigua TEMPERATURE CO₂ Relative Humidity and Climate Change
• 年，卷（期）: 2020,（4）
• 页码范围: 357-370
• 页数: 14页
• 分类号: O17

摘要

Climate change will have a noteworthy bearing on survival, development, and population dynamics of insect pests. Therefore, we contemplated the survival and development of beet army worm, <em>Spodoptera exigua</em> under different temperatures, (15<span style="white-space:nowrap;">&#176;</span>C, 25<span style="white-space:nowrap;">&#176;</span>C, 35<span style="white-space:nowrap;">&#176;</span>C, and 45<span style="white-space:nowrap;">&#176;</span>C), CO₂ (350, 550, 750 ppm) and relative humidity (55%, 65%, 75% and 85%) regimes. Maximum larval and pupal weights were recorded in insects reared at 25<span style="white-space:nowrap;">&#176;</span>C. The growth of <em>S. exigua</em> was faster at 35<span style="white-space:nowrap;">&#176;</span>C (larval period 7.4 days and pupal period 4.5 days) than at lower temperatures. At 15<span style="white-space:nowrap;">&#176;</span>C, the larval period was extended for 61.4 days and there was no adult emergence from the pupae till 90 days. The <em>S. exigua</em> hatchling was absent at 45<span style="white-space:nowrap;">&#176;</span>C. The larval survival ranged from 31.6% - 57.2%, maximum survival was recorded at 25<span style="white-space:nowrap;">&#176;</span>C, and minimum at 45<span style="white-space:nowrap;">&#176;</span>C. The maximum (84.27%) and minimum adult emergence were recorded in insects reared at 25<span style="white-space:nowrap;">&#176;</span>C and 35<span style="white-space:nowrap;">&#176;</span>C respectively. Maximum fecundity (384.3 eggs/female) and egg viability (51.97%) were recorded in insects reared at 25<span style="white-space:nowrap;">&#176;</span>C. Larval and pupal periods increased with an increase in CO₂ concentration. The highest pupal weights (128.6 mg/larva) were recorded at 550 ppm. The highest larval survival (73.50%) was recorded at 550 ppm and minimum (37.00%) at 750 ppm CO₂. Fecundity was the highest in insects reared at 550 ppm CO₂ (657.4 eggs/female), and the lowest at 750 ppm. Maxim