RELATIONSHIP BETWEEN THE NUMBERS OF ADULT MALE CATCHES ON PHERMONE TRAPS AND PERCENTAGE OF BOLL INFESTATION FOR COTTON BOLLWORMS IN MIDDLE EGYPT. | ||
| Journal of Plant Protection and Pathology | ||
| Article 2, Volume 4, Issue 6, June 2013, Pages 525-543 PDF (614.66 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jppp.2013.87401 | ||
| Authors | ||
| H. A. El-Kady1; E. M. Mohamed2; E. F. EL – Khayat3; S. A. Hosni2 | ||
| 1Economic Entomology Dept., Fac. of Agric., Damietta University, Egypt. | ||
| 2Sids Agric. Res. Station, Plant Protection Res. Institute, ARC, Giza, Egypt. | ||
| 3Fac. of Agric. , Moshtohor , Benha University, Egypt. | ||
| Abstract | ||
| Under field conditions of Beni- Suef Governorate , field studies were carried out at the farm of Sids Agriculture Research Station during 2006, 2007 and 2008 cotton seasons to study the monitoring the first appearance and populations of adult males of both pink bollworm, Pectinophora gossypiella (Saunders) and spiny bollworm, Earais insulana (Boisd.) by using Delta pheromone baited traps. The average number of male moths of P. gossypiella per trap / week during the period from April till September during the 2006, 2007 and 2008 cotton seasons, In the first season 2006, had five peaks of abundance in 5th May, 15th June, 14th July, 4th August and 8th September. In the second season 2007, also five peaks were observed. These peaks were occurred on 10th April, 24th April, 12th June, 24th July and 21st August. While in the third season 2008, four peaks were observed on 1st May, 29th May, 31st July and 4th September. The average number of male moths of E. insulana per trap / week during the periods extending from March 17th till September 15th , March 27th till 4th September and April 3rd till September 18th during the 2006, 2007 and 2008 seasons, respectively. In the first season 2006, four peaks of spiny bollworm were observed in 21st April, 30th June, 11th August and 15th September. In the second season 2007, five peaks were observed in 24th April, 8th May, 12th June, 24th July and 28th August. While in the third season 2008, four peaks observed in 1st May, 31st July, 4th September and 18th September. The combined effect of the two main weather factors on the changes in the population activity of the pink bollworm moths explained by the percentages of variance of the two tested weather factors were significant during 2006 and high significant during 2007 season , respectively but in 2008 season, was insignificant. The correlation between the spiny bollworm population and the weather factors Max. and Min. temperature and average relative humidity, it is obvious that a simple positive correlation coefficient between the average number of captured male moths in sex pheromone traps and max. temperature was found, but this correlation was insignificant during 2006 and 2007 seasons and significant 0.38 (P= 0.08) in 2008 growing season. The combined effect of the two main weather factors on the changes in the population activity of the spiny bollworm moths explained by the percentages of variance of the two tested weather factors which was significant during 2006, but in 2007 and 2008 planting seasons it was insignificant. | ||
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