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Abd El-Hameed, N., Haydar, M., Mousa, M. (2011). EFFECT OF CERTAIN ECOLOGICAL FACTORS ON POPULATION DENSITY OF Thrips tabaci LIND. ATTACKING ONION CROP. Journal of Plant Protection and Pathology, 2(11), 925-930. doi: 10.21608/jppp.2011.86624
Neama A. Abd El-Hameed; M. F. Haydar; Marwa M. Mousa. "EFFECT OF CERTAIN ECOLOGICAL FACTORS ON POPULATION DENSITY OF Thrips tabaci LIND. ATTACKING ONION CROP". Journal of Plant Protection and Pathology, 2, 11, 2011, 925-930. doi: 10.21608/jppp.2011.86624
Abd El-Hameed, N., Haydar, M., Mousa, M. (2011). 'EFFECT OF CERTAIN ECOLOGICAL FACTORS ON POPULATION DENSITY OF Thrips tabaci LIND. ATTACKING ONION CROP', Journal of Plant Protection and Pathology, 2(11), pp. 925-930. doi: 10.21608/jppp.2011.86624
Abd El-Hameed, N., Haydar, M., Mousa, M. EFFECT OF CERTAIN ECOLOGICAL FACTORS ON POPULATION DENSITY OF Thrips tabaci LIND. ATTACKING ONION CROP. Journal of Plant Protection and Pathology, 2011; 2(11): 925-930. doi: 10.21608/jppp.2011.86624

EFFECT OF CERTAIN ECOLOGICAL FACTORS ON POPULATION DENSITY OF Thrips tabaci LIND. ATTACKING ONION CROP

Article 2, Volume 2, Issue 11, November 2011, Page 925-930  XML PDF (293.89 K)
Document Type: Original Article
DOI: 10.21608/jppp.2011.86624
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Authors
Neama A. Abd El-Hameed1; M. F. Haydar2; Marwa M. Mousa2
1Department of Zoology ,Faculty of Science, AlAzhar University
2Plant Protection Res. Inst., Agric. Research Center, Dokki, Cairo, Giza
Abstract
Changes in the seasonal population of Thrips tabaci lind. attacking onion crop and the effect of environmental factors were studied throughout (2006/2007&2007/2008) onion growing seasons .it appeared in few numbers by the 2nd week of February . Dynamics of the nymphal stage showed increase steadily after half of February until end of March , and highest decrease in population density of thrips was recorded at temperature 24.52 and relative humidity 69 in  thrips populations. The values of correlation coefficient infer that infestation and degree days are highly correlated . The simple regression value (b) indicate that for every  1.0 temperature increase in degree days there are 3.5 individual increased and so on.
In onion growing season after rain falls population of T. tabaci decreased.
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