background and purpose: mortality statistics and rates show the development of a country in the world. these statistics are very important for determining the distribution of risk factors of mortality (in age and gender groups, ethnicity and so on) and they are useful for improving health and preventing from important diseases in future planning of countries in societies. materials and methods:...

biological and demographic parameters of the mealybug ladybird, cryptolaemus montrouzieri (mulsant) were evaluated on citrus mealybug, planococcus citri (risso) and obscure mealybug, pseudococcus viburni (signoret) under 24 ± 2 ºc, 80 ± 5% relative humidity and a photoperiod of 16:8 (l: d) h. the mealybugs had a significant effect on developmental time and reproductive and demographic parameter...

an investigation was carried out to study the developmental time, reproduction and life table of three populations of the onion thrips, thrips tabaci lindeman, on onion (khorasan and golestan populations) and also on tobacco (mazandaran population) in the laboratory at 25â°c, 50% rh and 16: 8 h l: d. the total life cycle from egg to adult of khorasan, golestan and mazandaran populations were ga...

the host plant quality not only influences on herbivorous insects but also indirectly could impact on their natural enemies’ performance. the current study was conducted to determine the effect of different nitrogen fertilization levels of canola (brassica napus l.) on life table parameters of the predatory gall midge, aphidoletes aphidimyza rondani; diptera: cecidomyiidae, in feeding of mustar...

J. Econ. Entomol. 91 (1): 34-40 (1998) ABSTRACT Effects of 3 conventional insecticides (methyl parathion, azinphos-methyl, cypermethrin) and 3 insect growth regulators (fenoxycarb, diflubenzuron, and tebufenozide) on life-table parameters of Micromus tasmaniae Walker were determined in adults derived from insecticide-treated larvae. The following parameters were compared with the control: sex r...

in this study two indices of tempo and quantum of fertility for the city of tehran are calculated. the tables are based on data which have been collected in a survey in 1986. the sampling was administrated at two stages. at the beginning 158 geographical points were considered (the number of first birth order during 24 hours in tehran), then on the first stage 17 random geographical points were...

the diamondback moth, plutella xylostella (l.) (lep.: plutellidae) is one of the most destructive insectpests of cruciferous crops throughout the world. in this research, the demographic parameters of p. xylostellawere studied on five rapeseed cultivars including licord, modena, okapi, rgsoo3 and regxkobra. theexperiments were conducted in a growth chamber at temperature of 25 â± 1â°c, 60 â± 5%...

The life table parameters of Macrosiphum rosae L. (Hemiptera: Aphididae) on five vermicompost-tea (tea-compost) concentrations (20, 40, 60, 80 and 100%) and control treatment (0%) on Rosa hybrida L. were determined under laboratory conditions. There were significant differences among pre-imaginal period and adult longevity of the aphid on the five teacompost concentrations. The highest mortalit...