Abstract
Effect of five soybean cultivars (Sahar, JK, BP, Williams, and L17) on life table parameters of the beet armyworm Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae) was evaluated at C, % relative humidity and a photoperiod of 16 h light/8 h dark. The highest and lowest net fecundity rates were obtained on Williams ( eggs/female) and L17 ( eggs/female), respectively. The net reproductive rates () were highest on Williams ( females/female/generation) and lowest on BP ( females/female/generation). The intrinsic rate of increase () differed significantly among five soybean cultivars, ranging from 0.1169 day−1 (on Williams) to 0.122 day−1 (on BP). The highest value of finite rate of increase () was on Williams (1.18 day−1), which was significantly different from other cultivars. The mean generation time () was significantly different on various cultivars, ranging from days (on L17) to days (on Sahar). The results are discussed with respect to the potential effect of soybean cultivars on the performance of S. exigua.
Highlights
Soybean (Glycine max (L.) Merrill) is an economically important crop and commercially produced in the northern region of Iran [1]
The beet armyworm, Spodoptera exigua (Hubner) (Lepidoptera : Noctuidae) is native to Asia but has been introduced worldwide and is found almost anywhere its many host crops are grown. It is an important pest of soybean in Iran [2] and some parts of the world [3, 4]
The objective of this research was to examine the effect of different soybean cultivars on the life table of S. exigua, which is useful for its management and potential soybean breeding for resistance
Summary
Soybean (Glycine max (L.) Merrill) is an economically important crop and commercially produced in the northern region of Iran [1]. The beet armyworm, Spodoptera exigua (Hubner) (Lepidoptera : Noctuidae) is native to Asia but has been introduced worldwide and is found almost anywhere its many host crops are grown. It is an important pest of soybean in Iran [2] and some parts of the world [3, 4]. The intensive use of insecticides for control of this pest has resulted in high levels of resistance to virtually all commercial insecticides in many parts of the world [4, 7]. The objective of this research was to examine the effect of different soybean cultivars on the life table of S. exigua, which is useful for its management and potential soybean breeding for resistance
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