List of Articles نوسانات جمعیت

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  1 - Seasonal population fluctuations of the cabbage white butterfly, Pierisrapaein cauliflower fields of the South of Tehran
  Gholamhosein Hasanshahi Zahra Dousti Fatemeh Jahan Alireza Askarianzadeh Jaber Karimi Habib Abbasipur
  The cabbage white butterfly, Pierisrapae (Linnaeus, 1758) (Lep.: Pieridae) is one of the most important pests of Cruciferous or Brassicaceaefamily plants in regions of Shahriar, Kahrizak and Sahr’e Ray and every year its damage can be seen on the leaves of these p More

  The cabbage white butterfly, Pierisrapae (Linnaeus, 1758) (Lep.: Pieridae) is one of the most important pests of Cruciferous or Brassicaceaefamily plants in regions of Shahriar, Kahrizak and Sahr’e Ray and every year its damage can be seen on the leaves of these plants. In order to study the seasonal population fluctuation of P. rapae, One hectare cauliflower field in the middle of a large field was randomly selected in five regions of cauliflower fields in southof Tehran were chosen and sampled every 10 days. Each plant was presumed as a sampling unit and sample size was determined as 20 host plants and all eggs, larvae and pupa on the host plant were recorded. Results of this study showed that Jahanabad and Shahed fields had the highest egg density (18.91±5.60) and the lowest egg density (16.53±4.04) was seen in the Playin field during season. In the Shahed field, highest egg density occurred in June 19 and the lowest egg density was seen on October 25. In the Playin field, the highest and lowest egg density was seen on September 29 and June 19, respectively. In the Jahanabad field the highest (2.99±0.66) and lowest (0.41±0.10) larval density was occurred during the season among different regions. Highest density was observed in the Jahanabad field during the harvest time on October 25 and the lowest larval density was seen on June 19. The highest and lowest larval density was seen in the field of Playin  on 25rd October and 19th June, respectively. Kahrizak (0.87±0.16) and Playin (0.19±0.05) fields had the highest and lowest pupal density in different regions during the season. In the field of Kahrizak, highest pupal density was occurred on 25rd October and in the playin field, the lowest pupal density was seen on 19th June. In the Playin field, highest density of pupae was occurred on 14th October and 25rd October and the lowest density of pupae was observed on 19th June and 2th July, respectively. The results showed that number of larval and pupal stages based on units density, between all experimental regions and Shahed university station had not significant difference. Manuscript profile
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  2 - Study on the population dynamics and spatial distribution of the cucurbit Fly; Dacus ciliatus Loew (Dip., Tephritidae)
  M. Barzkar Sh. Goldasteh R. Eslamizadeh B. Usefi
  The Cucurbits fly Dacus ciliates (Dip.,Tephritidae) is one of the most important pest on cucurbit crops in different parts of the Khuzestan province, Iran. Population dynamics of the pest was studied on three varieties (Spring cucumber, Armenian cucumber and Fall cucurb More

  The Cucurbits fly Dacus ciliates (Dip.,Tephritidae) is one of the most important pest on cucurbit crops in different parts of the Khuzestan province, Iran. Population dynamics of the pest was studied on three varieties (Spring cucumber, Armenian cucumber and Fall cucurbit) in Safi Abad agricultural and natural resource research and education center of Dezful, in spring and fall, in 2009. The number of adults caught in yellow sticky traps, the eggs and larvae of different ages were counted weekly in infected fruits. The results showed that there were three population peaks of immature stages in all varieties. The highest number of adults in Spring cucumber caught was 6.65 per trap in middle of Jun and in Armenian cucumber was 4.35 in the late of Jun and in Fall cucurbit was 9.5 adult per trap in the Oct. The Iwao, s Index and Taylor, power law were applied to evaluate spatial distribution of the egg and Immature stages. Results showed that Taylor, s power law gave a better fitness result for egg and Immature stages. The results of this research could be apply in integrated pest management of cucurbit fly. Manuscript profile
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  3 - The seasonal population fluctuations of pomegranate fruit moth, Ectomyelois ceratoniae Zeller and quince moth, Euzophera bigella Zeller in pomegranate orchards
  N. Naserian H. Farazmand R. Vafaei Shoushtari A. Avand-Faghih N. Azadbakht
  The pomegranate fruit moth, Ectomyelois ceratoniae Zeller, and quince moth, Euzophera bigella Zeller, are the major frugivorous pest. They cause qualitative and quantitative losses of pomegranate fruit. Sexual pheromone traps may provide a real estimation of adult emerg More

  The pomegranate fruit moth, Ectomyelois ceratoniae Zeller, and quince moth, Euzophera bigella Zeller, are the major frugivorous pest. They cause qualitative and quantitative losses of pomegranate fruit. Sexual pheromone traps may provide a real estimation of adult emergence and flight activity periods, emigration and immigration of such pests. To fulfill such a purpose, an experiment was performed to observe the population fluctuation of E. ceratoniae and E. bigella using synthetic pheromone traps in pomegranate orchards of Tang-e-Siab Koohdasht (Lorestan, Iran), in 2011. Adults of E. ceratoniae and E. bigella appeared in late April and May, respectively, and their flights continued until mid November. These pests populations showed four and three flight peaks during the growth season, respectively. The quince moth's population was higher than on pomegranate fruit moth's population, while the peak of the moth flight was between late July to early August. So in the pomegranate orchards of Lorestan region, in addition to pomegranate fruit moth, quince moth is one of the important fruit pests. The quince moth appears a month later in comparison to pomegranate fruit moth and both are active until the end of the season. Manuscript profile
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  4 - The population fluctuations of Euzophera bigella (Zeller) and Cydia pomonella (L.) at quince orchards
  P. Kermani H. Farazmand J. Karimzadeh A. Avand-Faghih
  The lepidopterans Euzophera bigella (Zeller) (Pyralidae) and Cydia pomonella (L.) (Tortricidae) are the most important pests of quince trees in Iran, as they cause the qualitative and quantitative losses on quince fruits. The present study was performed to monitor the p More

  The lepidopterans Euzophera bigella (Zeller) (Pyralidae) and Cydia pomonella (L.) (Tortricidae) are the most important pests of quince trees in Iran, as they cause the qualitative and quantitative losses on quince fruits. The present study was performed to monitor the population fluctuations of E. bigella and L. pomonella using synthetic pheromone traps at quince orchards in Falavarjan (Isfahan, Iran). In addition, the influence of climatic factors on population fluctuations was studied. It was found that E. bigella adults appeared in early March, showing four population peaks during growth season. The adults of L. pomonella were, however, showed up in middle March with five seasonal population peaks. The populations of male E. bigella were positively correlated with relative humidity, weekly rainfall (up to 3.5 mm), weekly means of minimum and maximum relative humidity and temperature (higher than 25 °C). In addition, when rainfall was 1.2 mm, no significant effects of weekly means of minimum and maximum relative humidity and temperature were observed on E. bigella densities. The population densities of male E. bigella also showed a significant positive correlation (r = 0.58) with relative humidity. Manuscript profile
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  5 - Population fluctuations of the citrus cottony scales, Pulvinaria aurantii (Hem., Coccidae) on the sour oranges
  Sh. Faghihzadeh Gorji Shila Goldasteh A. Zamani
  The sour oranges is a horticultural crop in Iran and planted as ornamental trees all over the world (except polar regions) such as the north of Iran. The citrus cottony scales Pulvinaria aurantii Ckll. feeds on the foliage and stems of citrus trees and cause tree diebac More

  The sour oranges is a horticultural crop in Iran and planted as ornamental trees all over the world (except polar regions) such as the north of Iran. The citrus cottony scales Pulvinaria aurantii Ckll. feeds on the foliage and stems of citrus trees and cause tree dieback in heavy infestation. In order to estimate the seasonal population fluctuations in Babol (Mazandaran province, Iran), sampling were done at the height of 1.5 to 2.5 meter of citrus trees  and samples were collected from four  geographical directions and three points including initial, medial and apical 40 cm of the branches. Further information such as daily temperature, relative humidity, and the amount of rainfalls simultaneously were recorded in each sampling date. The maximum number of population was observed in the January of 2014. We found that this species completes four generations per year. Based on the results of this study the best time for managements of the 1st, 2nd, 3rd and 4th generation of P. aurantii Ckll. in Babol is May, September, and to spot spraying in November and December, respectively. Pruning can be usefull too. In this study, natural enemies’ minority were observed which may be related to the insecticide treatments, absence of intermediate host and also the environmental pollution. Our results could lead to improve integrated pest management for P. aurantii Ckll.populations in the north of Iran. Manuscript profile
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  6 - Seasonal population fluctuations of Mediterranean pine bark beetle, Orthotomicus erosus (Wollaston) (Coleoptera:Curculionidae:Scolytinae), in the Tehran Chitgar forest park
  T. Arkani H. Ostovan H. Farazmand M. Gheybi
  One of the main problems of pine trees in the Chitgar park located in Tehran, Iran, is pine bark beetles, which not only cause direct harms to these trees but also is vector of some viral  and bacterial pathogens. To study the seasonal population fluctuations of th More

  One of the main problems of pine trees in the Chitgar park located in Tehran, Iran, is pine bark beetles, which not only cause direct harms to these trees but also is vector of some viral  and bacterial pathogens. To study the seasonal population fluctuations of the pest, the sampling process of adults from pine barks was performed in different regions of the park in 2015 to 2017. Twelve infected centers in the park were selected and four cross trap were installed in each center. The mass capturing pheromone of Orthotomicus erosus and pine kairomone dispensers were used in each trap. The distance between traps was about 50 meters. According to the observed data, the emergence of adult beetles was started in early April and continued until mid-December. The average daily capture per trap was four beetles. From mid-December onwards, no beetles were caught in the traps. Mediteranean pine bark beetle had at least six flight peaks in the area of study. The most trapping were observed in 8 June, 28 June, 27 July, 16 August, 5 September and 25 September respectively. The The highest number of trap catches was registered in September, July, August, June, September and October, with 9.2, 7.7, 7.2, 5.7, 2.4 and 1.6 beetles per trap respectively. Also, the mean average of total capture during spring, summer, autumn and winter were 401, 1159,114 and zero beetles per trap; so, the most activity of the pest was observed in summer, spring and autumn respectively The highest number of beetle was in the north and the least was captured in the south of the park. Manuscript profile