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Frontiers of Agriculture in China

ISSN 1673-7334

ISSN 1673-744X(Online)

CN 11-5729/S

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Front Agric Chin    0, Vol. Issue () : 231-236    https://doi.org/10.1007/s11703-011-1059-5
RESEARCH ARTICLE
Impacts of abiotic factors on population fluctuation of insect fauna of Vigna radiata and Tetranychus urticae Koch in Sindh, Pakistan
Yasir Ahmed KHAN1, Wajad NAZEER2(), Asifa HAMEED2, Jehanzeb FAROOQ3, Muhammad Rafiq SHAHID3
1. Sindh Agriculture University Tandojam, Pakistan; 2. Cotton Research Station Multan, Pakistan; 3. Cotton Research Institute Faisalabad, Pakistan
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Abstract

Effect of temperature and relative humidity on population dynamics of insect pests of mung bean was studied during mung bean growing season of 2005. Insect pests included thrips (Thrips tabaci Lind.) and field cricket (Gryllus assimilis) and one arachnid pest mite (Tetranychus urticae Koch). Results revealed that the maximum population of thrips and mites was observed on August 23, 2005 with 1.537±0.031 per leaf and July 6, 2005 with 3.271±0.09 per leaf, respectively. The population of field cricket differed significantly during crop season and reached its peak during the initial stage of crop growth on June 14, 2005, i.e., 0.873±0.014 per plant at the temperature and relative humidity of 32°C and 54%, respectively, while the minimum population was noted on August, i.e., 0.710±0.010 per plant. Present studies conclusively document the correlation of weather factors and insect pest population. Temperature had a negative and significant correlation with thrips (r=-0.860) and a positive and significant correlation with mites (r=0.606) and field cricket (r=0.439). However, the relative humidity displayed a positive and significant correlation with thrips (r=0.569), a negative non-significant correlation with mites (r=-0.313), and a significant negative correlation with field cricket (r=-0.770).
Keywords abiotic factor      insect fauna      Thrips tabaci Lind      Gryllus assimilis      Tetranychus urticae Koch     
Corresponding Author(s): NAZEER Wajad,Email:wajidnazirpbg@gmail.com   
Issue Date: 05 June 2011
 Cite this article:   
Yasir Ahmed KHAN,Wajad NAZEER,Asifa HAMEED, et al. Impacts of abiotic factors on population fluctuation of insect fauna of Vigna radiata and Tetranychus urticae Koch in Sindh, Pakistan[J]. Front Agric Chin, 0, (): 231-236.
 URL:  
https://academic.hep.com.cn/fag/EN/10.1007/s11703-011-1059-5
https://academic.hep.com.cn/fag/EN/Y0/V/I/231
Fig.1  Sindh Province in Pakistan and experimental location.
observation datemean temperature/°Crelative humidity/%thripsmitesfield crickets
14.06.0532.0541.106 b2.678 ab0.873 a
20.06.0533.5671.062 b3.013 ab0.803 a
28.06.0532.75681.073 b3.105 a0.762 abc
06.07.0530.5761.181 b3.271 a0.757 cd
11.07.0531.5701.178 b3.094 a0.769 bc
18.07.0530.5741.158 b2.948 ab0.757 cd
25.07.0533.25761.132 b2.796 ab0.719 de
01.08.0532.0801.173 b2.825 ab0.710 e
08.08.0529.5761.483 a2.384 ab0.710 e
17.08.0529.5801.416 a2.458 ab0.710 e
23.08.0530.0781.537 a2.012 b0.710 e
29.08.0528.75781.504 a2.253 ab0.710 e
Tab.1  Mean population of thrips, mites per leaf, and field cricket per plant recorded on mung bean crop affected by date of observation, varieties, and their interactions
Fig.2  Effect of temperature and relative humidity on population of on mung bean.
character correlatedcoefficient of correlation (r)coefficient of determination (r2)regression (?)regression coefficient (byx)
mean temperature v/s
mite-0.860 **0.7404.297-0.098
thrips0.606 **0.367-1.8880.148
field crickets0.439 *0.1930.1220.020
relative humidity v/s
thrips0.569 *0.3240.2460.014
mite-0.313 NS0.0983.928-0.016
field crickets-0.770 **0.5931.269-0.007
Tab.2  Relationship between population of insect pests and temperature and relative humidity in mung bean crop
Fig.3  Effects of temperature and relative humidity on the population of on mung bean.
Fig.4  Effect of temperature and relative humidity on population of on mung bean.
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