| 范锦胜1,张李香1*,王贵强1,王慧姝1,2.寄主植物对甜菜夜蛾种群动态的影响[J].植物保护,2012,38(4):33-37. |
| 寄主植物对甜菜夜蛾种群动态的影响 |
| Effects of host plants on the population dynamics parameters of the beet armyworm, Spodoptera exigua |
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| DOI： |
| 中文关键词: 甜菜夜蛾 寄主植物 种群增长 生命表 |
| 英文关键词:Spodoptera exigua host plants population dynamics life table |
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| 中文摘要: |
| 为了明确甜菜夜蛾在藜、苋菜、甜菜和葱上的种群动态，通过室内试验，测定了4种寄主植物对甜菜夜蛾生长发育和繁殖等种群增长参数的影响，组建了甜菜夜蛾在供试植物上的实验种群生命表。结果表明，取食苋菜和藜的幼虫发育历期最短，而取食葱的发育历期最长（平均为16.00 d）。蛹的发育历期在藜上最短（8.70 d），在苋菜上最长（10.30 d）。寄主植物不影响甜菜夜蛾卵的孵化率和蛹的存活率，但影响幼虫的存活率。幼虫的存活率在藜上最高（74.67％），葱上最低（26.25％）。藜、苋菜、甜菜和葱上甜菜夜蛾单雌平均产卵量分别为589.80、376.40、454.60、532.70粒。甜菜夜蛾雌蛾在藜、苋菜、甜菜、葱上的产卵呈现明显的动态变化。取食藜组和甜菜组雌蛾的产卵高峰出现在羽化后第2天，苋菜组为羽化后第3天，而葱组则为羽化后第1天和第3天。甜菜夜蛾在藜上的种群净增殖率（R0）、内禀增长率（rm）和周限增长率（λ）最高，平均世代周期（T）、种群加倍时间（t）最低。4种寄主植物中，甜菜夜蛾的适宜寄主植物依次为藜、苋菜、甜菜和葱。 |
| 英文摘要: |
| The objective of this study was to understand the effects of four different host plants (Chenopodium album,Amaranthus mangostanu,Beta vulgaris and Allium fistulosum) on the population dynamics of the beet armyworm. Individuals of a laboratory population of the beet armyworm were taken to observe the development, survival and reproduction on four host plants, and the life tables of beet armyworm was set up. The larval and pupal development periods were influenced by the host plants. The larvae feeding on the amaranth and lambsquarter had shorter developmental duration, followed by those on the sugarbeet, whereas those on green onion had the longest developmental duration (16.00 d). The pupal period was the shortest (8.70 d) on the lambsquarter and longest on the amaranth (10.30 d). The S.exigua egg’s hatching rate and pupal survival rates were not different on the four host plants, but the larval survival rate was influenced by the host plants. The larval survival rate was up to 74.67% on the lambsquarter as compared to only 26.25% on the green onion. The total numbers of eggs laid per female on lambsquarter, amaranth, sugarbeet and green onion were 589.80, 376.40, 454.60 and 532.70, respectively. The adult female oviposition appeared to be obviously dynamic. The egg laying peaks appeared in the second day after eclosion on the lambsquarter and sugarbeet, the third day on the amaranth, the first day and the third day on the green onion. The net reproductive rate (R0), the innate capacities for increase (rm) and the finite rate of increase (λ) were the highest, and the mean generation time (T) and doubling time (t) were the lowest on the lambsquarter. The results suggest that C.album is the most suitable host plant of the beet armyworm, followed by A.mangostanu,B.vulgaris and A.fistulosum. |
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