Thermal Requirements and Performance of the Parasitoid Trichogramma pretiosum (Hymenoptera: Trichogrammatidae) on Helicoverpa armigera (Lepidoptera: Noctuidae) Eggs Under Variable Temperatures

2017 ◽  
Vol 46 (5) ◽  
pp. 1156-1164 ◽  
Author(s):  
V Zuim ◽  
H S Rodrigues ◽  
D Pratissoli ◽  
J B Torres
Keyword(s):  
Helicoverpa Armigera ◽  
Trichogramma Pretiosum ◽  
Thermal Requirements ◽  
Helicoverpa Armígera ◽  
And Performance ◽  
Lepidoptera Noctuidae

scholarly journals Biological parameters of three Trichogramma pretiosum strains (Riley, 1879) (Hymenoptera: Trichogrammatidae) on eggs Helicoverpa armigera (Hübner, 1805) (Lepidoptera: Noctuidae)

2017 ◽  
Vol 39 (3) ◽  
pp. 349 ◽  
Author(s):  
Gabriel dos Santos Carvalho ◽  
Luciana Barbosa Silva ◽  
Maisa Sousa Veras ◽  
Eliane Carneiro Bueno dos Santos ◽  
Mayra Layra dos Santos Almeida ◽  
...  
Keyword(s):  
Helicoverpa Armigera ◽  
Biological Parameters ◽  
Trichogramma Pretiosum ◽  
Helicoverpa Armígera ◽  
Lepidoptera Noctuidae

scholarly journals Performance of Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) on eggs of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae)

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Valéria Lucas Laurentis ◽  
Dagmara Gomes Ramalho ◽  
Nathália Alves Santos ◽  
Vanessa Fabíola Pereira Carvalho ◽  
Alessandra Marieli Vacari ◽  
...  
Keyword(s):  
Helicoverpa Armigera ◽  
Trichogramma Pretiosum ◽  
Helicoverpa Armígera ◽  
Lepidoptera Noctuidae ◽  
Helicoverpa Armigera Hubner

scholarly journals Biological parameters and thermal requirements of Trichogramma pretiosum reared on Helicoverpa armigera eggs

2017 ◽  
Vol 52 (11) ◽  
pp. 961-968
Author(s):  
Gabriel dos Santos Carvalho ◽  
Luciana Barboza Silva ◽  
Soislan Sousa Reis ◽  
Maisa Sousa Veras ◽  
Eliane Carneiro ◽  
...  
Keyword(s):  
Helicoverpa Armigera ◽  
Life Stages ◽  
Biological Parameters ◽  
Trichogramma Pretiosum ◽  
Degree Days ◽  
Thermal Threshold ◽  
Thermal Requirements ◽  
Preimaginal Development ◽  
Helicoverpa Armígera ◽  
The Given

Abstract: The objective of this work was to determine the biological parameters and thermal requirements of Trichogramma pretiosum TM strain reared on Helicoverpa armigera eggs. A card containing 20 eggs of H. armigera was offered for each T. pretiosum female, at temperatures of 18, 20, 22, 25, 28, 30 and 32°C. All life stages of T. pretiosum were observed under the given temperature conditions. The optimum temperature for the parasitism of T. pretiosum was 25°C, and the highest longevity was found at the same temperature. The highest parasitoid emergence rates occurred at temperatures of 22, 25 and 28°C. The highest proportion of T. pretiosum individuals emerged per egg was observed at 18°C. Concerning the sex ratio, the highest proportion of females occurred at 28°C, and the highest percentage of parasitism viability was observed at this same temperature. The lowest thermal threshold for total preimaginal development and thermal requirements of T. pretiosum were 10.82°C and 134.55 degree-days, respectively. The estimated number of generations of T. pretiosum in the average temperatures of municipality of Bom Jesus, state of Piauí, Brazil is four per month.

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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