Age and density effect of the laboratory host, Corcyra cephalonica Stainton (Lep., Pyral.), on the egg-larval parasitoid Chelonus blackburni Cameron (Hym., Braconidae)

2009 ◽  
Vol 90 (1-5) ◽  
pp. 391-395 ◽  
Author(s):  
A. V. N. Paul ◽  
B. Parshad ◽  
P. Kumar
Keyword(s):  
Density Effect ◽  
Corcyra Cephalonica ◽  
Larval Parasitoid ◽  
Chelonus Blackburni

scholarly journals Impact of volatile cues on foraging response of egg larval parasitoid, Chelonus blackburni Cameron

2019 ◽  
Author(s):  
Surabhi Singh ◽  
Bishwajeet Paul ◽  
Archna Kumar
Keyword(s):  
Foraging Behaviour ◽  
Adult Stage ◽  
Gas Chromatography Mass Spectrometry ◽  
Host Searching ◽  
Saturated Hydrocarbons ◽  
Host Insect ◽  
Larval Parasitoid ◽  
Orientation Response ◽  
Volatile Cues ◽  
Chelonus Blackburni

Y-tube olfactometer study was carried out to observe the orientation response of egg-larval parasitoid Chelonus blackburni Cameron towards various concentrations of volatile cues emitted from three potato varieties and Phthorimaea operculella Zeller. Volatile cues were subjected to Gas Chromatography-Mass Spectrometry (GC-MS) profiling to identify the signaling molecules present in the pool of volatile cues. Out of 16 selected volatile cues concentrations obtained from plant and host insect sources, 10 cues acted as significant attractant for C. blackburni. Volatile cues emitted from Kufri Surya in vegetative stage were able to generate highest stimulation in C. blackburni. Among volatiles obtained from larval and adult stage of P. operculella, adult cues were found to be more efficient in the alteration of foraging behaviour of targeted parasitoid. GC-MS of targeted cues revealed the presence of fifteen saturated hydrocarbons ranging from C12 to C54; varying in concentrations. Study specified that C. blackburni preferred cues could be exploited to enhance the host searching efficacy during Integrated Pest Management releases.

scholarly journals Lack of fit with the neighbourhood social environment as a risk factor for psychosis – a national cohort study

2021 ◽  
pp. 1-9
Author(s):  
Peter Schofield ◽  
Jayati Das-Munshi ◽  
Roger T. Webb ◽  
Henriette Thisted Horsdal ◽  
Carsten B. Pedersen ◽  
...  
Keyword(s):  
Low Income ◽  
Minority Groups ◽  
Density Effect ◽  
Ethnic Minority Groups ◽  
Ethnic Density ◽  
Affective Psychosis ◽  
Lack Of Fit ◽  
National Cohort ◽  
Group Density ◽  
Manual Occupation

Abstract Background Many studies report an ethnic density effect whereby psychosis incidence among ethnic minority groups is higher in low co-ethnic density areas. It is unclear whether an equivalent density effect applies with other types of socioeconomic disadvantages. Methods We followed a population cohort of 2 million native Danes comprising all those born on 1st January 1965, or later, living in Denmark on their 15th birthday. Socioeconomic disadvantage, based on parents' circumstances at age 15 (low income, manual occupation, single parent and unemployed), was measured alongside neighbourhood prevalence of these indices. Results Each indicator was associated with a higher incidence of non-affective psychosis which remained the same, or was slightly reduced, if neighbourhood levels of disadvantage were lower. For example, for individuals from a low-income background there was no difference in incidence for those living in areas where a low-income was least common [incidence rate ratio (IRR) 1.01; 95% confidence interval (CI) 0.93–1.10 v. those in the quintile where a low income was most common. Typically, differences associated with area-level disadvantage were the same whether or not cohort members had a disadvantaged background; for instance, for those from a manual occupation background, incidence was lower in the quintile where this was least v. most common (IRR 0.83; 95% CI 0.71–0.97), as it was for those from a non-manual background (IRR 0.77; 95% CI 0.67–0.87). Conclusion We found little evidence for group density effects in contrast to previous ethnic density studies. Further research is needed with equivalent investigations in other countries to see if similar patterns are observed.

A new species of Glyptapanteles (Hymenoptera: Braconidae: Microgastrinae), a larval parasitoid of Elymnias hypermnestra (Linnaeus) (Lepidoptera: Nymphalidae), along with some new host records of parasitoids from Peninsular India

Zootaxa ◽  
2012 ◽  
Vol 3227 (1) ◽  
pp. 54 ◽  
Author(s):  
ANKITA GUPTA ◽  
BLAISE PEREIRA
Keyword(s):  
New Species ◽  
New Host ◽  
Peninsular India ◽  
Larval Parasitoid ◽  
Hymenopteran Parasitoids ◽  
First Time ◽  
A New Species ◽  
New Host Records

A new species, Glyptapanteles hypermnestrae Gupta and Pereira, is described from Maharashtra, India, and comparedwith closely allied species. This new species was bred from parasitized larvae of Elymnias hypermnestra (Linnaeus) (Lep-idoptera: Nymphalidae). In addition to this, two hymenopteran parasitoids, Apanteles folia Nixon (Braconidae: Microgas-trinae) and Brachymeria indica (Krausse) (Chalcididae), are for first time reported parasitizing larvae of Arhopalaamantes (Hewitson) (Lepidoptera: Lycaenidae) and pupae of Pareronia valeria (Cramer) (Lepidoptera: Pieridae) respectively.

High Current Density Effect on In-situ Atomic Migration Characteristics of a BiTe Thin Film System

2013 ◽  
Vol 52 (10S) ◽  
pp. 10MC06
Author(s):  
Seunghyun Kim ◽  
Yong-Jin Park ◽  
Young-Chang Joo ◽  
Young-Bae Park
Keyword(s):  
Thin Film ◽  
Current Density ◽  
High Current Density ◽  
Density Effect ◽  
Film System ◽  
High Current ◽  
Thin Film System

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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