Susceptibility of Field Populations of Beet Armyworm (Lepidoptera: Noctuidae) to Commercial and Experimental Insecticides

Mascarenhas, V. J.; Graves, J. B.; Leonard, B. R.; Burris, E.

doi:10.1093/jee/91.4.827

Cited by 36 publications

(22 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During their research on natural product, Abo-Elghar et al (1994) found that laboratory strain of cotton leafworm was more tolerant to bacillus thuringiensis and Abamectin (fermentation of the actinomycete, Streptomyces avermitilitis) than field strain. In spinosad bioassays, Mascarenhas et al (1998) demonstrated that field strains of Spodoptera exigua had significantly lower LC 50 values than reference strain. Moulton et al (1999) found that field population of 2 nd and 3 rd instar of Spodoptera exigua was 3-to 70-fold less susceptible to spinosad than a reference laboratory population.…”

Section: Discussionmentioning

confidence: 96%

Susceptibility of field and laboratory strains of Cotton leafworm, Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae) to spinosad pesticide under laboratory conditions

Ahmed¹,

Temerak²,

Abdel-Galil³

et al. 2016

Plant Prot. Sci.

View full text Add to dashboard Cite

Ahmed M.A.I., Temerak S.A.H., Abdel-Galil F.A.-K., Manna S.H.M. (2016): Susceptibility of field and laboratory strains of Cotton leafworm, Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae) to spinosad pesticide under laboratory conditions. Plant Protect. Sci., 52: 128-133.The susceptibility of field and laboratory strains against all instars larvae of S. littoralis to spinosad pesticide after a 24-and 48-h exposure and under laboratory conditions was investigated. As a result against 1 st instar larvae, the LC 50 values after 24 h were 12 and 0.275 µg/ml for laboratory and field strain, respectively. In addition, the resistance ratio (RR) of 1 st instar was 43.64-fold. In this interim, the 48 h LC 50 values were 8.7 and 0.18 µg/ml for laboratory and field strain, respectively and the RR was 48.33-fold, which revealed the field strain was more susceptible to spinosad than the laboratory strain. Distinctly similar trend was shown for later instar larvae stages. For instance, in 6 th instar larvae, the LC 50 values after a 24-h exposure to spinosad were 1100 and 105 µg/ml for the laboratory and field strain, respectively, and the RR value was 10.48-fold. Furthermore, after a 48-h exposure, the LC 50 values for laboratory and field strains were 500 and 42 µg/ml, respectively, with RR value being 11.90-fold. On the other hand, according to relative tolerance values, the 6 th instar larvae were the most tolerant instar of all the instars tested. The susceptibility of 6 th , 5 th , and 4 th instar larvae was comparable and significantly lower than that of 3 rd , 2 nd , and 1 st instar larvae. However, the 1 st instar was the least tolerant. The results implied that spinosad may play a potential role in the control of S. littoralis and, therefore, it is considered a promising tool in integrated pest management program to control Cotton leafworm which is becoming resistant to conventional pesticides in Egypt.

show abstract

Section: Discussionmentioning

confidence: 96%

Susceptibility of field and laboratory strains of Cotton leafworm, Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae) to spinosad pesticide under laboratory conditions

Ahmed¹,

Temerak²,

Abdel-Galil³

et al. 2016

Plant Prot. Sci.

View full text Add to dashboard Cite

show abstract

“…Most herbivores are affected by the physiological and nutritional states of their host plants [33], such as cotton plants expressing Cry1Ac toxin. Some pest species have also developed resistance or tolerance to Bt toxin under the continuous selection pressure of the toxic protein [2,34].…”

Section: Discussionmentioning

confidence: 99%

“…Carriere et al [40] reported that resistance to Cry1Ac in Pectinophora gossypiella was associated with over-wintering fitness costs. Other pest species have also been reported to develop Bt resistance under the continuous selection pressure of the Bt toxin [2,34]. However, not all lepidopteran pest species are equally susceptible to Bt.…”

Section: Discussionmentioning

confidence: 99%

“…Insecticide application against the larval stage of herbivorous insects is the primary control method; however, a high tolerance to most insecticides and associated environmental problems may jeopardize their continued use [2]. Genetically engineered cotton plants, which exhibit enhanced-resistance or tolerance to insect pests, are a major success of transgenic technology.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Temporal allocation of metabolic tolerance to transgenic Bt cotton in beet armyworm, Spodoptera exigua (Hübner)

Guo

Wan

2011

Sci. China Life Sci.

View full text Add to dashboard Cite

Digestive and detoxification enzyme activity and nutrient composition were examined in the body of fourth instar beet armyworms, Spodoptera exigua (Hübner), fed on transgenic Bacillus thuringiensis (Bt) and non-Bt cotton for different time periods. Nutrient composition and specific enzyme activities differed significantly between the S. exigua fed Bt vs. non-Bt cotton. At 1, 6 and 24 h, free fatty acid and glucose levels were significantly lower in S. exigua fed on Bt cotton than those fed on non-Bt cotton. S. exigua fed on Bt cotton had significantly higher trypsin and total superoxide dismutase (T-SOD) activities and significantly lower lipase, carboxylesterase and acetylcholinesterase activities than non-Bt fed worms for all feeding time periods. Differences were also observed among feeding times within each cotton variety group. Significantly lower free fatty acid and total amino acid were observed in S. exigua fed on Bt cotton for 24 h than in those fed for 1 h. Significantly lower activities of lipase and trypsin were detected in S. exigua fed on Bt cotton for 24 h than those for 1 and 4 h. However, carboxylesterase and acetylcholinesterase activities in S. exigua fed on Bt cotton for 24 h were significantly higher than those for 1, 4 and 6 h. The interaction between cotton variety and feeding time significantly affected the activities of lipase, trypsin, acetylcholinesterase and T-SOD enzymes in S. exigua. Measuring the temporal allocation of protection and detoxification enzyme activities in the body of S. exigua in response to B. thuringiensis can provide a meaningful evaluation on the metabolic tolerance of herbivorous insects under the continuous selection pressure of a toxic protein.

show abstract

“…Almerian growers attempt to control S. exigua infestations by applying broad spectrum or new generation biorational insecticides singly, or in cocktails, at weekly intervals. Frequent use of synthetic insecticides has resulted in widespread resistance in many S. exigua populations, including those of Almeria (Smagghe et al 1997(Smagghe et al , 2003Mascarenhas et al 1998;Torres Vila et al 1998;Moulton et al 1999;Moulton et al 2002). The presence of pesticide residues in greenhouse produce from this region also requires continual monitoring (Garrido et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Efficacy ofSpodoptera exiguamultiple nucleopolyhedrovirus as a biological insecticide for beet armyworm control in greenhouses of southern Spain

Lasa

Pagola

Ibáñez

et al. 2007

Biocontrol Science and Technology

View full text Add to dashboard Cite

Chemical control measures targeted at Spodoptera exigua in greenhouse sweet pepper crops in Spain have resulted in pest resistance to virtually all commercially available insecticidal products. A multicapsid nucleopolyhedrovirus (SeMNPV), isolated from diseased S. exigua in Spain, was produced in laboratory reared larvae, tested for insecticidal activity in a laboratory bioassay, and was then applied in eleven commercial greenhouses planted with sweet pepper. Virus occlusion bodies (OBs) were applied on two occasions, at an interval of Â7 days, at a rate of 5)10 8 OBs/L of spray in a volume of Â600 L/ha, depending on crop phenology and greenhouse area. The percentage of plants showing recent ( B48 h old) feeding damage fell dramatically in greenhouses with high infestations of S. exigua ; the same pattern was observed, although less dramatically, in greenhouses with low infestations. Average mortality of larvae collected from treated plants at 4 days after each application, and reared in the laboratory until death, was high (70 Á89%) and was not significantly affected by the degree of crop infestation. In a separate trial, the rate of acquisition of infection was examined in larvae that fed on plants treated with 1)10 8 or 5 )10 8 OBs/L of spray. Of the 27 and 60% of larvae, respectively, that acquired infection in the 48 h period after spraying, about half became infected in the first 6 h post-application, irrespective of application rate. Acquisition of infection proceeded more slowly during the night-time compared to the daytime period, underlining the advantages of early morning applications of the virus. We conclude that the Spanish SeMNPV isolate merits registration as a biological insecticide for use in greenhouse crops in this region.

show abstract

Susceptibility of Field Populations of Beet Armyworm (Lepidoptera: Noctuidae) to Commercial and Experimental Insecticides

Cited by 36 publications

References 0 publications

Susceptibility of field and laboratory strains of Cotton leafworm, Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae) to spinosad pesticide under laboratory conditions

Susceptibility of field and laboratory strains of Cotton leafworm, Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae) to spinosad pesticide under laboratory conditions

Temporal allocation of metabolic tolerance to transgenic Bt cotton in beet armyworm, Spodoptera exigua (Hübner)

Efficacy ofSpodoptera exiguamultiple nucleopolyhedrovirus as a biological insecticide for beet armyworm control in greenhouses of southern Spain

Contact Info

Product

Resources

About