List of Articles Population density

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  1 - Population density of Eurygaster integriceps (Het., Scutelleridae) and spatial distribution pattern of its nymphs on irrigated wheat field in Chadegan city
  Zahra Doosti Naser Moeini-Naghadeh Abbas Ali Zamani Leila Naderloo
  The Sunn-pest, Eurygaster integriceps Put., is the most important insect pest of wheat and barley in Chadegan city, in Isfahan province. This study was conducted on a farm with an area of one hectare in 2015 and 2016 in Chadegan county. In this research with sampling re More

  The Sunn-pest, Eurygaster integriceps Put., is the most important insect pest of wheat and barley in Chadegan city, in Isfahan province. This study was conducted on a farm with an area of one hectare in 2015 and 2016 in Chadegan county. In this research with sampling regular population fluctuation and spatial distribution nymphal stage different by using Taylor’s power law and Iwao’s patchiness regression was calculated. Based on the results of Taylor’s power law in 2015 (except 5 nymphal stage) and 2016 the spatial distribution of nymphal instars different, was determined aggregated. In Iwao’s patchiness regression, the spatial distribution of nymphal stages different in 2015, was determined aggregated and in 2016 the spatial distribution except 3 and 4 nymphal instars, was determined aggregated. Upon the results of this research, appearance date 1st to 5th nymphal instars in 2015 were observed in 10th, 16th, 16th, 19th and 26th May respectively. appearance date 1st to 5th nymphal instars in 2016 were observed in 18th, 21th, 23th, 31th May and 4th Jun respectively. Maximum density population 2nd nymphal instar that is the best time for control sunn pest was observed in 2015 and 2016, 30th may (2.43±0.65) and 4th Jun, respectively Manuscript profile
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  2 - Comparison of population density and spatial distribution of Tydeus longisetosus El-Bagoury & Momen, Tetranychus turkestani (Ugarov & Nikolskii) and their predator Zetzellia mali (Ewing) on two apple varieties
  S. Khodayari K. Kamali Y. Fathipour
  Population density of Tydeus longisetosus El-Bagoury & Momen, Tetranychus turkestani (Ugarov & Nikolskii) and their predator Zetzellia mali (Ewing) on two varieties of apple (Golden delicious and Golab) was studied in Maragheh (Northwestern of Iran) during summe More

  Population density of Tydeus longisetosus El-Bagoury & Momen, Tetranychus turkestani (Ugarov & Nikolskii) and their predator Zetzellia mali (Ewing) on two varieties of apple (Golden delicious and Golab) was studied in Maragheh (Northwestern of Iran) during summer of 2006. The result showed that the mean density of T. longisetosus and T. turkestani on Golden delicious and Golab varieties were 3.35±0.67, 4.02±0.91 and 1.022±0.12, 1.26±0.45 per leaf, respectively. The mean density of Z. mali were 0.829±0.23 and 1.057±0.25 per leaf on Golden delicious and Golab varieties, respectively. Comparison of mean densities on two varieties was done by t-test and showed no significant differences between mean densities on two varieties. Spatial distribution of two species was determined by Taylor's power law, Morisita's coefficient and index of dispersion. Taylor's power law showed that spatial distribution of T. longisetosus on Golden delicious and Golab varieties wasaggregated and random, respectively. T. turkestani was distributed in aggregated pattern on Golab variety and there was no significant relationship between its parameters on Golden delicious, in this way Z. mali was distributed randomly on two varieties too. Aggregated spatial distribution of all species was determined by Morisita's coefficient and index of dispersion on two varieties in most cases. Linear regression between mean density of phytophagous and predaceous mites showed that the predator acts as density independent. Apple varieties have no effect on population density of studied mites but make an effect on spatial distribution of them to some extents.  Manuscript profile
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  3 - Effect of plant nourishments on Tetranychus urticae Koch (Acari: Tetranychidae) abundance, in Watermelon Fields of Esfarayen region
  isa jabaleh behzad amiri majid taherian
  Watermelon with a vast area of cultivation is one of the most important products of the North Khorasan Province and the city of Esfarayen. In these areas, Tetranychus urticae can be considered as one of the most important pests of this product; the uncontrolled use of c More

  Watermelon with a vast area of cultivation is one of the most important products of the North Khorasan Province and the city of Esfarayen. In these areas, Tetranychus urticae can be considered as one of the most important pests of this product; the uncontrolled use of chemical pesticides causes the population to become resistant to pesticides and remains; poisons are very important for their fresh food; Plant nutrition quality hosts a factor influencing pest growth and reproduction. In order to investigate the effect of nutrition in field conditions on different biological stages of T. urticae, an experiment in the form of a randomized complete block design with seven treatments (chicken manure, cow manure, sheep manure, NPK, NPK + Humic acid, Humic acid and control) in Three sampling times were performed in 2015 in Esfarayen city. The results showed that the largest population of T. urticae in chicken manure on biological stages (egg, larva, nymph and adult), respectively, with an average (34.1 ± 27.12, 78.1 ± 04.12, 35.1 ± 04 . 8 and 69.1 ± 73.12) and the lowest number in the NPK + Humic acid fertilizer granulation in biological stages (egg, larva, nymph and adult), respectively (67.0 ± 16.4, 55.0 ± 88.2, 38.0 ± 18.2 and 67.0 ± 07.5) was observed. The results of this research granular fertilizer treatment Humic acid and Humic acid + NPK granulated onion fields in order to control the two-spotted spider mite is considered Manuscript profile
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  4 - Distribution and population density of the cereal cyst nematodes (Heterodera Spp.) in rain-fed fields of wheat and barley of the Markazi province
  M. Hajihasani A. Hajihasani M. Ghalandar
  The cereal cyst nematodes are one of the most important soil-born pathogens on wheat and barley throughout the world. The two species of the cereal cyst nematodes, H. filipjevi and H. latiponsare widely distributed in Iran, but H. avenae has limited distribution. A fiel More

  The cereal cyst nematodes are one of the most important soil-born pathogens on wheat and barley throughout the world. The two species of the cereal cyst nematodes, H. filipjevi and H. latiponsare widely distributed in Iran, but H. avenae has limited distribution. A field survey was conducted for determining of distribution regions and population density of the cereal cyst nematodesin Markazi province in 2009. In this study 83 soil sample of wheat and barley fields were taken from Arak, Shazand, Farmahin, Ashtian, Komijan, Tafresh, Zarandieh, Mahallat, Khomein and Saveh regions. The modified Fenwick can technique was used to extract cysts from the soil. Based on the morphological characteristics of the second stage juveniles and the vulval cone structures, two species were identified as H. filipjevi and H. latipons. The results showed that H. filipjevi was the most dominant species in both wheat and barley fields, whereas, H. latipons was found on wheat in Khomein and Zarandieh regions. H. filipjevi had more distribution and population density in Farmahin, Tafresh and Khomein regions in comparison to other regions. The cereal cyst nematodes were found in 39.7% of rain-fed fields of wheat and barley of the Markazi province. The most of nematode population density was determined (20-40 cyst per 300 g of soil) in some cereal fields that can be as one of limiting factor in yield reduction. Manuscript profile
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  5 - The Investigation of Abundance and Population Density of Mountain Racerunner (Eremias montanus) at Meydan Mishan of Hamadan Provine of Iran
  عماد رهبر نصرالله رستگارپویانی محمود کرمی علیرضا محمدی
  Many biological studies require the estimation of population density or population size are also needed to determine the size of specimens of species distribution pattern is used. So the purpose of this study that on the mountain racerunner at Alvand heights such as acc More

  Many biological studies require the estimation of population density or population size are also needed to determine the size of specimens of species distribution pattern is used. So the purpose of this study that on the mountain racerunner at Alvand heights such as accepted, determine the density and distribution pattern .this species is Thus only within a small Zagros Mountains in the provinces of Kermanshah and Hamadan has been reported, and a species is considered native to Iran. In this study, that from April to October 2010 while starting activity species after hibernation done, the study area to two A and B share .was the exact density of these methods line transect using the Hine estimate respectively 16.9 and 20.1 individuals per hectare and the estimated population of this species respectively 725 and 321 individuals was calculated. the most important factors in the difference density such Among areas of plant density, the pores and gaps, bait needed, slope and elevation was determined, the pattern of distribution of this species using chi-squared random obtained, using plot and test index of dispersion, chi-squared goodness of fitness and G-test of Williams distribution pattern cavities and prey was Random and distribution pattern plants was pile. Manuscript profile