ECOLOGICAL STUDIES ON POPULATION DENSITY OF APHIDS INFESTING PEA PLANTS AND ITS YIELD IN SHARKIA GOVERNORATE, EGYPT | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 10, Volume 27, Issue 4, April 2002, Page 2676-2688 PDF (3.54 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2002.253687 | ||||
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| Author | ||||
| , H. M. EI-Sharkawy | ||||
| Dept. of Plant Protection, Institute of Efficient Productivity, Zagazig University, Egypt. | ||||
| Abstract | ||||
| Ecological studies on aphid spices infesting pea plants were carried out under field condition at EI-Zagazig region Sharkia Governorate, during two successive seasons 2000/2001 and 2001/2002, Obtained results could be summarized and clarified as follow: 1) The collected aphid species were Acrysip < /em>hum pisum (Harris), Aphis craccivora (Koch), and Aphis gossypii (Glover). 2) The seasonal abundance of the dominant aphid species can be summarized as follow: a- Three peaks for Acrysip < /em>hum pisum (Harris) were noticed on pea plants in the third week of December, third week of January and end of February. b- Three peaks of Aphis craccivora (Koch) were recorded on pea plants in the third week of December, third week of January and third week of February. 3) The effects of temperature and relative humidity revealed that the correlation coefficient was significant with temperature and insignificant with relative humidity, also path coefficient between temperature and relative humidity, show that temperature seemed to be affected on the population of aphids followed by relative humidity. 4) The effects of certain agricultural practices on the population density of aphids and yield can be summarized as follow: The first sowing date (of zo" October) with variety (Lincoln) and fertilization (recommended) showed the lowest infestation by aphids in the two seasons, while the second sowing date rso" October) with variety (Little Marvel), and fertilization (recommended) showed the highest yield. | ||||
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