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Trichogramma evanescens Westwood is an important biological control agent of lepidopteran pests and is widely distributed throughout Iran. In the current study, parasitism rate of T. evenescens on different egg ages of the Anagasta= Ephestia kuehniella Zeller (1, 2, 3 and 4- day- old) was studied at 25±1ºC, 55±5% RH and 16: 8 h L: D photoperiod. The results obtained showed a significant effect on parasitism rate. The highest and the lowest values of net parasitism rate (C0) were 67.69 hosts and 15.92 hosts for 1 and 4- day- old eggs, respectively. The transformation rate of host population to parasitoid offspring (Qp < /sub>) was equal to 1 at all egg ages. The values of stable parasitism rate (ψ) decreased from 0.412 to 0.266 (host/parasitoid) with increasing host age from 1 to 4 day. Finite parasitism rate (was significantly affected by different egg ages and the highest (0.583 day-1) and lowest (0.337 day-1) values were recorded for 1 and 4- days- old eggs, respectively. The results of the current study indicated that parasitism of T. evanescens was strongly affected by different egg ages of A. kuehniella. This finding provide helpful information for mass rearing of T. evanescens.

The prevalence of Covid 19 disease has different consequences in economic, social and psychological levels. Anxiety is one of the psychological consequences of this disease. Some individual variables, such as defense mechanisms has important role in anxiety. Therefore, the aim of the present study was to determine and investigate the relationship between the use of various defense mechanisms and the anxiety of corona virus.

The present descriptive correlational study was conducted in 2020. The statistical population of the study was selected from all people aged 20 to 80 years in the southern provinces of the country, including Fars, Khuzestan, Chaharmahal and Bakhtiari and Isfahan. Sampling method was available and based on the consent of individuals for cooperation. This method was selected due to Covid 19 disease limitations. The anxiety questionnaires and Andrewsm singh and Bond defense mechanisms were completed virtually through social networks. The collected data were analyzed using multiple regression tests.

The results revealed that high levels of Coronavirus anxiety (in physical and mental dimensions) were positively correlated with high scores in psychologically disturbed and underdeveloped defense mechanisms. Defense mechanisms furthermore predicted 58% of Coronavirus anxiety. Based on beta coefficients, among the three defense mechanisms, the highest positive and statistically significant effect power was not statistically related to the defense mechanism (β=29) and the lowest effect was the psychologically disturbed defense mechanism (β=21) and the defense mechanism was developed. It had a negative predictive power(β= -27).

The results disclosed that proper use of defense mechanisms is one of the ways to maintain mental health and in dealing with any crisis, apart from health measures, attention to intrapersonal variables, especially in the field of defense styles and confrontations, can help to develop more complete and indigenous treatment protocols.