scholarly journals Effect of Prolonged Storage on the Virulence of Polyhedral Inclusion Body from Seven Nucleopolyhedrovirus Isolates Infectious to the Tobacco Cutworm, Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae).

2005 ◽  
Vol 49 (3) ◽  
pp. 119-122 ◽  
Author(s):  
Katsuo Tsuda ◽  
Kouhei Yamashita ◽  
Yositaka Sakamaki ◽  
Kanetosi Kusigemati ◽  
Chisa Yasunaga-aoki ◽  
...  
Keyword(s):  
Inclusion Body ◽  
Spodoptera Litura ◽  
Prolonged Storage ◽  
Tobacco Cutworm ◽  
Polyhedral Inclusion Body ◽  
Lepidoptera Noctuidae

scholarly journals Toxicity of isolated phenolic compounds from Acorus calamus L. to control Spodoptera litura (Lepidoptera: Noctuidae) under laboratory conditions

2022 ◽  
Vol 9 (1) ◽  
Author(s):  
Phatcharaphon Wiwattanawanichakun ◽  
Siriwan Saehlee ◽  
Thitaree Yooboon ◽  
Nutchaya Kumrungsee ◽  
Saksit Nobsathian ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Crude Extract ◽  
Spodoptera Litura ◽  
Acorus Calamus ◽  
Botanical Pesticides ◽  
Laboratory Conditions ◽  
Tobacco Cutworm ◽  
Insecticidal Efficacy ◽  
Chemical Pesticides ◽  
Lepidoptera Noctuidae

Abstract Background Spodoptera litura (Lepidoptera: Noctuidae), the tobacco cutworm, is an prominent agricultural pest. To reduce the use of chemical pesticides that cause health problems and that leave residue in the environment, some botanical pesticides have been developed. Our research aimed to evaluate the insecticidal efficacy of Acorus calamus L. extract for the control of S. litura under laboratory conditions. Results After 24 h of topical application, the A. calamus methanolic crude extract showed toxicity against secondary instar S. litura larvae (LD50 ~ 7.438 µg/larva). Chrysin (5,7-dihydroxy flavone), one of the isolated phenolic compounds, showed optimal control efficiency (LD50 ~ 2.752 µg/larva) and showed a reduction in carboxylesterase activities, which have detoxification reduction roles in larvae. Conclusion Chrysin in the crude extract of A. calamus may be an active compound to control this pest, and it may be applied as an alternative to minimize the usage of chemical insecticides. Graphical Abstract

Effects of sublethal doses of chlorfluazuron on the biochemical constituents of eggs of Spodoptera litura (Lepidoptera: Noctuidae)

2011 ◽  
Vol 143 (2) ◽  
pp. 178-184
Author(s):  
F. Perveen
Keyword(s):  
Embryonic Development ◽  
Spodoptera Litura ◽  
Treated Male ◽  
Biochemical Constituents ◽  
Tobacco Cutworm ◽  
Sublethal Doses ◽  
Lepidoptera Noctuidae

AbstractThe effects of sublethal doses (LD10: 1.00 ng/larva; LD30: 3.75 ng/larva) of chlorfluazuron on the biochemical constituents of eggs of the tobacco cutworm, Spodoptera litura (F.), are described. Chlorfluazuron was applied topically to fifth-instar larvae and the subsequent adults were allowed to mate according to larval treatment (LD10-treated female × LD10-treated male and LD30-treated female × LD30-treated male). Biochemical constituents of eggs resulting from these pairings were analyzed at various stages of embryonic development. Compared with controls, LD10 or LD30 reduced egg constituents as follows: protein (min.–max.) by 32.8%–34.5% or 62.0%–67.3%, lipid by 33%–34% or 62%–67%, carbohydrates by 30%–39% or 60%–67%, DNA by 33%–40% or 60%–69%, RNA by 31%–34% or 59%–67%, and ecdysteroid by 22%–83% or 28%–92%, respectively. The relative proportions of constituents in control eggs were as follows: protein > lipid > carbohydrate, and RNA > DNA. Three low and three high peaks in ecdysteroid titres were observed. Compared with controls, all peaks were reduced in LD10 or LD30 eggs as follows: low peaks: 1st (at 8 h): 32% or 66%; 2nd (at 16 h): 33% or 67%; 3rd (at 52 h): 35% or 65%; high peaks: 1st (at 32 h): 83% or 92%; 2nd (at 64 h): 65% or 82%; 3rd (at 84 h): 84 h, 36% or 63%, respectively. In addition, the first two high peaks were delayed by 4 h in LD10 eggs and by 8 h in LD30 eggs compared with controls. Sublethal doses of chlorfluazuron reduced the amounts of biochemical constituents of eggs during embryogenesis in S. litura.

DNA Sequence Variation of the Tobacco Cutworm, Spodoptera litura (Lepidoptera: Noctuidae), Determined by Mitochondrial A+T-rich Region and Nuclear ITS2 Sequences

2011 ◽  
Vol 49 (11-12) ◽  
pp. 760-787 ◽  
Author(s):  
Xinlong Wan ◽  
Jianhong Li ◽  
Min Jee Kim ◽  
Hae Chul Park ◽  
Sung-Soo Kim ◽  
...  
Keyword(s):  
Dna Sequence ◽  
Spodoptera Litura ◽  
Sequence Variation ◽  
Rich Region ◽  
Tobacco Cutworm ◽  
Dna Sequence Variation ◽  
Lepidoptera Noctuidae

scholarly journals Biological Control of Tobacco Cutworm, Spodoptera litura (Lepidoptera: Noctuidae) by Steinernematid and Heterorhabditid Entomopathogenic Nematodes

2008 ◽  
Vol 47 (4) ◽  
pp. 447-456 ◽  
Author(s):  
Hyeong-Hwan Kim ◽  
Sung-Rae Cho ◽  
Ho-Yul Choo ◽  
Sang-Myeong Lee ◽  
Heung-Yong Jeon ◽  
...  
Keyword(s):  
Biological Control ◽  
Spodoptera Litura ◽  
Entomopathogenic Nematodes ◽  
Tobacco Cutworm ◽  
Lepidoptera Noctuidae
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