The influence of different temperatures and relative humidity on Trichogramma brassicae Bezdenko., populations, a biological control agent, collected from pomegranate orchards, in Iran

Publish Year: 1396
نوع سند: مقاله کنفرانسی
زبان: English
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NCOCA05_251

تاریخ نمایه سازی: 7 مهر 1398

Abstract:

The Carob moth, Apomyelois (Ectomyelois) ceratoniae (Zell), is one of the pests of Mediterranean origin where it is an economic and sometimes major pest of crops such as Carob. This pest is the key pest of pomegranate in Iran. Under natural conditions, Carob moth attacks to pomegranate from April in Iran but it is varied for different areas according to weather conditions. Because of certain problems in chemical control of this pest, the biological control, is of main interest. The egg parasitoid, Trichogramma, is used extensively around the world as a biological control agent for the control of lepidopterous pests. One purpose of this work was to collect native Trichogramma wasps from pomegranate orchards in Iran (Markazi and Yazd provinces). The collected wasps were determined as Trichogramma brassicae Bezdenko.The present study aimed to compare the fertility life tables of two native populations of T. brassicae, from pomegranate orchards, under different regimes of temperatures and relative humidity. Environmental factors, specially temperature and humidity are the effective factors on the efficiency of this wasp. So here, effect of temperature (20, 25 and 30C) on fertility life table parameters was investigated in laboratory conditions using Jackknife method. Life table assays revealed that temperature, had significant effects on the intrinsic rate of natural increase, for two populations. According to the highest value of rm, 30C was determined as optimum temperature. So, the effect of three relative humidity on life table parameters was tested at 30C. The life table response experiment showed that relative humidity had significant effect on fertility life table parameters (P0.0001). The highest value of rm was at 6510% RH. Survival curve analysis revealed that significant differences exist among the three temperatures for Saveh (Markazi province) population and for Yazd population. No significant differences were observed among the survival curves of relative humidity treatments for Yazd and Saveh populations. Regarding to the results of this study, we can focus on quality of environmental issues, as well as consider information pertaining to optimal release conditions of T. brassicae as an effective biological control agent. Temperature and humidity are two essential components of mass production facilities for consistent rearing of insects in field release programs. Because of mass rearing of Trichogramma as a natural enemy in insectaries, our findings also are useful for mass production of parasitoids. Demographic parameters of Trichogramma reared under different temperature and humidity, also have implications for examining the dynamics of species, strains or populations. Rate of parasitism, longevity of adults, emergence rate, sex ratio and finally fitness, can be different in relation to environmental conditions. After laboratory studies, more attention should be devoted to semi-field and field experiments to obtain more applicable results in field conditions.

Authors

Mitra Moezipour

Department of Plant Protection, Agricultural and Natural Resources Research Center of Mazandaran. Sari, Iran

Seyyed Hossein Goldansaz

Department of Plant Protection, Faculty of Agriculture, University of Tehran, Karaj, Iran.Q

Marjan Seiedy

School of Biology and Center of Excellence in Phylogeny of Living Organisms, College of Science, University of Tehran, Tehran, Iran

Mohammad Ahmadi

Department of Ntural Resources ,College of Agricultural and Natural Resources ,University of Mohaghegh Ardabili, Ardabil, Iran