Sublethal effects of spinosad on survival, growth and reproduction of Helicoverpa armigera (Lepidoptera: Noctuidae)

2008 ◽  
Vol 65 (2) ◽  
pp. 223-227 ◽  
Author(s):  
Dong Wang ◽  
Peiyu Gong ◽  
Mei Li ◽  
Xinghui Qiu ◽  
Kaiyun Wang
Keyword(s):  
Helicoverpa Armigera ◽  
Sublethal Effects ◽  
Helicoverpa Armígera ◽  
Lepidoptera Noctuidae ◽  
Growth And Reproduction

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 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

Incidence of Helicoverpa armigera (Lepidoptera: Noctuidae) and its natural enemies on smallholder crops in Kenya

1993 ◽  
Vol 83 (3) ◽  
pp. 321-328 ◽  
Author(s):  
H. van den Berg ◽  
M. J. W. Cock ◽  
G. I. Oduor ◽  
E. K. Onsongo
Keyword(s):  
Helicoverpa Armigera ◽  
Heliothis Armigera ◽  
Population Densities ◽  
Parasitoid Species ◽  
Larval Parasitoid ◽  
Total Percentage ◽  
Four Seasons ◽  
Helicoverpa Armígera ◽  
Lepidoptera Noctuidae ◽  
Experimental Plots

AbstractSmallholder crops (sunflower, maize, sorghum and cotton) were grown in experimental plots at seven sites, representing different agricultural zones of Kenya, over four seasons. Helicoverpa armigera (Hübner) (formerly Heliothis armigera) only occasionally achieved population densities sufficient to cause obvious damage to the crops, and was virtually absent from the coastal sites. At the inland sites, infestation and mortality levels varied greatly. Information is presented on the incidence of H. armigera, and the identity, distribution and frequency of its common parasitoids and (potential) predators, sampled in the experimental plots. Trichogrammatoidea spp., egg parasitoids, and Linnaemya longirostris (Macquart), a tachinid late-larval parasitoid, were the most common parasitoid species, but total percentage parasitism was rather low. Of the large complex of predators, only anthocorids and ants (predominantly Pheidole spp., Myrmicaria spp. and Camponotus spp.) were sufficiently common and widespread to be of importance in suppressing H. armigera. The abundance of predators fluctuated widely between sites, but anthocorids were most abundant at the western sites.

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