Browsing by Author "Yeh, Chih-Chun"

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Demography and Consumption of Spodoptera Litura (Lepidoptera: Noctuidae) Reared on Cabbage and Taro
(Oxford Univ Press inc, 2016) Tuan, Shu-Jen; Yeh, Chih-Chun; Atlihan, Remzi; Chi, Hsin; Tang, Li-Cheng
Spodoptera litura (F.) causes considerable economic damage to multiple agro-crops annually in many countries. In this study, the demography ofS. litura reared on cabbage and taro was investigated using the age-stage, two-sex life table at 25 +/- 1A degrees C, 60 A +/- 10% relative humidity, and a photoperiod of 12: 12 (L:D) h. Our results showed that the net reproductive rate, intrinsic rate, and finite rate of population increase on cabbage (1893.1 offspring, 0.2374 d(-1), and 1.2679 d(-1)) were all not significantly different from those on taro (1361.0 offspring, 0.2298 d(-1), and 1.2584 d(-1)). The net consumption rate on cabbage (439.1 cm(2)) was, however, three times higher than that on taro (141.7 cm(2)). According to the population parameters, both cabbage and taro are suitable host plants forS. litura. When both the population growth rate and the consumption rate were taken into consideration, the finite consumption rate on cabbage (omega = 3.8054) was significantly higher than that on taro (omega = 1.3184). In Taiwan, taro and cabbage are commonly planted in adjacent farm plots, with taro being grown from March to November and cabbage from October to April. Because of the overlapping growth periods of the two crops,S. litura can easily propagate throughout the year by switching between the adjacent crops during the overlap periods. Pest management strategies for controllingS. litura must be thoroughly reevaluated based on ecological characteristics, including its life table and consumption rate on its major host plants.
Linking Life Table and Predation Rate for Biological Control: a Comparative Study of Eocanthecona Furcellata (Hemiptera: Pentatomidae) Fed on Spodoptera Litura (Lepidoptera: Noctuidae) and Plutella Xylostella (Lepidoptera: Plutellidae)
(Oxford Univ Press inc, 2016) Tuan, Shu-Jen; Yeh, Chih-Chun; Atlihan, Remzi; Chi, Hsin
To better understand the predator-prey relationship and to compare predation rates, we studied the life table and predation rate of the predator Eocanthecona furcellata Wolff (Hemiptera: Pentatomidae) when reared on two major crucifer pests, Spodoptera litura (F.) (Lepidoptera: Noctuidae) and Plutella xylostella L. (Lepidoptera: Plutellidae). The net reproductive rate, intrinsic rate of increase, finite rate, and net predation rates of E. furcellata reared on P. xylostella were 292.4 offspring, 0.1389 d(-1), 1.1490 d-1, and 644.1 third instars of P. xylostella, respectively. These values are significantly higher than those reared on S. litura, i.e., 272.3 offspring, 0.1220 d(-1), 1.1298 d(-1), and 863.1 third instars of S. litura. To evaluate the predation potential of E. furcellata fed on P. xylostella and S. litura, we combined both the growth rate and predation rate to calculate the finite predation rate (omega); our results showed that E. furcellata is an effective predator of both S. litura (omega = 1.6029) and P. xylostella (omega = 1.4277).