Acute toxicity and sublethal effects of methoxyfenozide and thiodicarb on survival, development and reproduction of Helicoverpa armigera (Lepidoptera: Noctuidae)

2013 ◽  
Vol 43 ◽  
pp. 14-17 ◽  
Author(s):  
Moosa Saber ◽  
Ehsan Parsaeyan ◽  
Samad Vojoudi ◽  
Mohammad Bagheri ◽  
Ali Mehrvar ◽  
...  
Keyword(s):  
Acute Toxicity ◽  
Helicoverpa Armigera ◽  
Sublethal Effects ◽  
Helicoverpa Armígera ◽  
Lepidoptera Noctuidae

scholarly journals Sublethal effects of different fungal isolates on Helicoverpa armigera (Lepidoptera: Noctuidae)

2020 ◽  
Vol 30 (1) ◽  
Author(s):  
Tamires Doroteo de Souza ◽  
Fabricio Oliveira Fernandes ◽  
Ariadne Costa Sanches ◽  
Ricardo Antônio Polanczyk
Keyword(s):  
Helicoverpa Armigera ◽  
Sublethal Effects ◽  
Mortality Rates ◽  
Probit Analysis ◽  
Control Measures ◽  
Pupal Weight ◽  
Main Body ◽  
Biological Parameters ◽  
Helicoverpa Armígera ◽  
Lepidoptera Noctuidae

Abstract Background Broad-spectrum pesticides and Bt crops have been used against the cotton bollworm, Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae), but their effect on the environment and the development of resistance are the main limitations for these control measures. The use of mycobiopesticides is an ecofriendly and efficient alternative. Fungicides have a wide distribution and a high genetic variability, which allows their screening for more virulent isolates. Therefore, the objective of this work was to evaluate the interactions of H. armigera larvae with Metarhizium anisopliae and Beauveria bassiana, on mortality, virulence, sublethal effects, and life table aspects. Main body The isolates that caused mortality rates of H. armigera above 80% were selected for further assays. Virulence was measured by LC50 estimates, using Probit analysis to sublethal effects, and the bootstrap procedure to estimate the biological parameters: time for development, fertility, longevity, pre-ovipositional period, egg viability, and sex ratio. The H. armigera mortality rates caused by B. bassiana and M. anisopliae ranged from 45 to 100% and from 40 to 90%, respectively. Longevity, fertility, and survival rates are affected in all treatments. The pupal weight of individuals treated with fungi was lower than in the control. Deformations were observed in H. armigera pupae developed from larvae treated with B. bassiana. Conclusion The use of sublethal concentrations of isolates of M. anisopliae and B. bassiana resulted in an adverse effect on the biological parameters of H. armigera.

scholarly journals Comparative Toxicity of Helicoverpa armigera and Helicoverpa zea (Lepidoptera: Noctuidae) to Selected Insecticides

Insects ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 431 ◽  
Author(s):  
Fernando R. da Silva ◽  
Dario Trujillo ◽  
Oderlei Bernardi ◽  
Jose Carlos Verle Rodrigues ◽  
Woodward D. Bailey ◽  
...  
Keyword(s):  
Puerto Rico ◽  
Acute Toxicity ◽  
Insecticide Resistance ◽  
Helicoverpa Armigera ◽  
Helicoverpa Zea ◽  
Corn Earworm ◽  
Median Lethal Concentration ◽  
Helicoverpa Armígera ◽  
Old World Bollworm ◽  
Lepidoptera Noctuidae

Until recently, the Old World bollworm (OWB) Helicoverpa armigera (Hübner) and the corn earworm Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae) were geographically isolated. Both species are major pests of agricultural commodities that are known to develop insecticide resistance, and they now coexist in areas where H. armigera invaded the Americas. This is the first study to compare the susceptibility of the two species to conventional insecticides. The susceptibility of third instar H. armigera and H. zea larvae to indoxacarb, methomyl, spinetoram, and spinosad was determined using a diet-overlay bioassay in a quarantine laboratory in Puerto Rico. Mortality was assessed at 48 h after exposure for up to eight concentrations per insecticide. Spinetoram exhibited the highest acute toxicity against H. armigera, with a median lethal concentration (LC50) of 0.11 µg a.i./cm2, followed by indoxacarb and spinosad (0.17 µg a.i./cm2 for both) and methomyl (0.32 µg a.i./cm2). Spinetoram was also the most toxic to H. zea (LC50 of 0.08 µg a.i./cm2), followed by spinosad (0.17 µg a.i./cm2) and methomyl (0.18 µg a.i./cm2). Indoxacarb was the least toxic to H. zea, with an LC50 of 0.21 µg a.i./cm2. These findings could serve as a comparative reference for monitoring the susceptibility of H. armigera and H. zea to indoxacarb, methomyl, spinetoram, and spinosad in Puerto Rico, and may facilitate the detection of field-selected resistance for these two species and their potential hybrids in areas recently invaded by H. armigera.

scholarly journals Toxicity and sublethal effects of insecticides on Helicoverpa armigera Hbner (Lepidoptera: Noctuidae)

2016 ◽  
Vol 11 (22) ◽  
pp. 1966-1972 ◽  
Author(s):  
Carneiro Eliane ◽  
Barboza Silva Luciana ◽  
Faria Silva Alexandre ◽  
Bueno Santos Vilmar ◽  
Layra Santos Almeida Mayra ◽  
...  
Keyword(s):  
Helicoverpa Armigera ◽  
Sublethal Effects ◽  
Helicoverpa Armígera ◽  
Lepidoptera Noctuidae

scholarly journals The Sublethal Effects of Chlorantraniliprole on Helicoverpa armigera (Lepidoptera: Noctuidae)

2013 ◽  
Vol 12 (3) ◽  
pp. 457-466 ◽  
Author(s):  
Rui-min ZHANG ◽  
Jun-feng DONG ◽  
Jia-hua CHEN ◽  
Qing-e JI ◽  
Jin-jie CUI
Keyword(s):  
Helicoverpa Armigera ◽  
Sublethal Effects ◽  
Helicoverpa Armígera ◽  
Lepidoptera Noctuidae
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