Post‐Traumatic Stress Disorder (PTSD) was initially conceptualized as a psychopathology that arose as a consequence of war time experiences. More recently, available evidence has demonstrated that post‐traumatic stress (PTS) as a consequence of war is buffered by social identity processes. In such contexts, identity resources are arguably more readily accessible given the integral relationship between social identities and intergroup violence. There is no evidence as yet to suggest that social identity processes may act to reduce PTS responses to naturally occurring disasters such as earthquakes and even less data pertaining to non‐Western contexts where the impact of such disasters tends to be particularly catastrophic. This article reports on a study undertaken in earthquake‐affected regions in Nepal devastated by the April 2015 quake and its major aftershock a month later. Participants (n=399) completed measures of their earthquake experience, Post‐Traumatic Stress and Post Traumatic growth (PTG), as well as measures of community identification and collective efficacy. In total 399 people completed the measures approximately six months after the quakes. Results of the study indicated that consistent with tenets of the social identity framework, ethnic and gender group memberships impacted on reported experiences during the earthquake. Reported experience during the quakes and ethnic group membership were both related to increased symptoms of PTS. Ethnicity was also linked to the proportion of respondents reporting clinical levels of PTSD symptoms. The relationship between earthquake experience and PTG was mediated by community identification and collective efficacy. Earthquake experience also had an indirect effect on PTS through collective efficacy. Implications of these findings for those working with traumatized groups are discussed.

Insecticidal plant-based compound(s)in combinations may show synergistic or antagonistic interactions against insect pest. Considering the rapid spread of the Aedes borne diseases and increasing resistance among Aedes population against conventional insecticides, twenty-eight combinations of plant essential oil-based terpene compounds were prepared and tested against larval and adult stages of Aedes aegypti . Initially five plant essential oils (EOs) were assessed for their larvicidal and adulticidal efficacy and two of their major compounds from each EO were identified from GC-MS results. Identified major compounds namely Diallyldisulfide, Diallyltrisulfide, Carvone, Limonene, Eugenol, Methyl Eugenol, Eucalyptol, Eudesmol and α-pinene were purchased and tested individually against A . aegypti . Binary combinations of these compounds were then prepared using sub-lethal doses, tested and their synergistic and antagonistic effects were determined. The best larvicidal compositions were obtained while Limonene was mixed with Diallyldisulfide and the best adulticidal composition was obtained while Carvone was mixed with Limonene. Commercially used synthetic larvicide “Temephos” and adulticide “Malathion” were tested individually and in binary combinations with the terpene compounds. The results revealed that the combination of Temephos and Diallyldisulfide and combination of Malathion and Eudesmol were the most effective combination. These effective combinations bear potential prospect to be used against Aedes aegypti .

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Botanical insecticides are preferred for their environment and user-friendly nature. Eugenol is a plant-based monoterpene having multifarious biocidal activities. To understand whether eugenol would persistently work against Aedes aegypti, we performed larvicidal bioassays on thirty successive generations and determined median lethal concentration (LC50) on each generation. Results showed no apparent differences between LC50 at F0 (63.48 ppm) and F30 (64.50 ppm) indicating no alteration of susceptibility toward eugenol. To analyze, if eugenol has any effect on metabolic detoxification-associated enzymes, we measured esterases (alpha and beta), cytochrome P450, and GST activities from the survived larvae exposed to LC50 concentration from F0–F30. Results revealed a decrease of esterases, GST, and cytochrome P450 activities at the initial 4–8 generations and then a gradual increase as the generations progressed. GST activity remained significantly below the control groups. Synergists (TPP, DEM, and PBO) were applied along with eugenol at F30 and LC50 concentration, and the said enzyme activities were recorded. Results showed a noticeable decrease in LC50 and enzyme activities indicating effective inhibitions of the respective enzymes. Overall, present results inferred that eugenol would effectively work as a larvicide for a longer period in successive generations without initiating rapid resistance and therefore could be advocated for controlling A. aegypti.