ORIGINAL ARTICLE
Effect of different constant temperatures on biology of Schizaphis graminum (Rondani) (Hemiptera: Aphididae) on barley, Hordeum vulgare L. (Poaceae) in Iran
1
Department of Entomology and Plant Pathology, College of Abouriahan, University of Tehran, P.O.Box 33955-159, Pakdasht, Iran
2
Islamic Azad University, Miyaneh Branch, P.O.Box 22345-786, Miyaneh, Iran
3
Department of Entomology, College of Agriculture, Tarbiat Modarres University P.O. Box 14115-336, Tehran, Iran
Corresponding author
Katayoon Kheradmand
Department of Entomology and Plant Pathology, College of Abouriahan, University of Tehran, P.O.Box 33955-159, Pakdasht, Iran
Department of Entomology and Plant Pathology, College of Abouriahan, University of Tehran, P.O.Box 33955-159, Pakdasht, Iran
Journal of Plant Protection Research 2012;52(3):319-323
KEYWORDS
TOPICS
ABSTRACT
The temperature dependent biology of greenbug,
Schizaphis graminum
Rondani on Kavir barley cultivar was studied at
seven constant temperatures including 10, 15, 19, 22, 26, 31, and 33±1°C, 70% relative humidity (RH), and a photoperiod of 16:8 (L:D)
hours. The period of immature development ranged between 6.60 days at 26°C to 28.56 days at 10°C, respectively. All tested aphids
failed to develop at 33°C. The calculated
r
m
and λ values were significantly the highest at 26°C and lowest at 10°C, respectively. The
mean generation time and doubling time of
S. graminum
decreased linearly by increasing the temperature from 10 to 26°C. Addition-
ally, the total number of offsprings per female was extremely low at 10 and 31°C, contrary to the highest and lowest values of life
expectancy at 10°C (41.73 days) and 31°C (7.66 days), respectively. The results of the present study revealed that temperature had
great effects on biology of
S. graminum
, which was never previously studied on barley in Iran.
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
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