Population density and spatial distribution pattern of Hypera postica (Coleoptera: Curculionidae) in Ardabil, Iran

Moradi-Vajargah, Mona, Golizadeh, Ali, Rafiee-Dastjerdi, Hooshang, Zalucki, Myron P., Hassanpour, Mehdi and Naseri, Bahram (2011) Population density and spatial distribution pattern of Hypera postica (Coleoptera: Curculionidae) in Ardabil, Iran. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 39 2: 42-48.

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Author Moradi-Vajargah, Mona
Golizadeh, Ali
Rafiee-Dastjerdi, Hooshang
Zalucki, Myron P.
Hassanpour, Mehdi
Naseri, Bahram
Title Population density and spatial distribution pattern of Hypera postica (Coleoptera: Curculionidae) in Ardabil, Iran
Formatted title
Population density and spatial distribution pattern of Hypera postica (Coleoptera: Curculionidae) in Ardabil, Iran
Journal name Notulae Botanicae Horti Agrobotanici Cluj-Napoca   Check publisher's open access policy
ISSN 0255-965X
1842-4309
Publication date 2011-07
Sub-type Article (original research)
Open Access Status File (Publisher version)
Volume 39
Issue 2
Start page 42
End page 48
Total pages 7
Place of publication Cluj-Napoca, Romania
Publisher Universitatea de Stiinte Agricole si Medicina Veterinara Cluj-Napoca
Collection year 2012
Language eng
Formatted abstract
The alfalfa weevil, Hypera postica (Gyllenhal), feeds almost exclusively on alfalfa, Medicago sativa L. in most region of the world where forage crop is grown. It has been investigated the population density and spatial distribution of alfalfa weevil on alfalfa in Ardabil during 2010. Using a 0.25 m2 quadrate sample unit a reliable sample size was 65, with maximum relative variation of 15%. The relative variation (RV) of the primary sampling data was 13.6. The highest population density of the alfalfa weevil was recorded on 17th April. To estimate the spatial distribution pattern of this pest, data were analyzed through index of dispersion, Lloyd’s mean crowding, Morisita’s index and two regression models (Taylor’s Power Law and Iwao’s Patchiness Regression). Taylor’s model showed an aggregated distribution pattern for all life stages. Iwao’s patchiness regression indicated that larvae, adult and total life cycle had aggregated spatial distribution (tc < tt), while pupae of alfalfa weevil exhibited a random pattern. The index of dispersion and Lloyd’s mean crowding methods indicated an aggregated distribution for this insect. Spatial distribution parameters of this species are used to outline a sampling program as well as to estimate population density of H. postica development stages. Optimum sample sizes for estimates of larval density, at three levels of precision, are presented.
Keyword Alfalfa weevil
Distribution pattern
Iwao's patchiness regression
Population fluctuation
Sampling program
Taylor's power law
Sampling Plans
Alfalfa
Thysanoptera
Homoptera
Thripidae
Abundance
Aphididae
Greece
Cotton
Size
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Biological Sciences Publications
 
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