MODELING THE CHANGES IN THE POPULATION GROWTH PATTERNS OF PINK BOLLWORM PECTINOPHORA GOSSYPIELLA (SAUND.) | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 3, Volume 81, Issue 2, July 2003, Page 451-465 PDF (3.55 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2003.276548 | ||||
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| Authors | ||||
| GAMEL B. E. EL-SAADANY1; YOUSEF E. Y. ABDALLAH1; AHMED A. AMIN2; HATEM M. SAYED3 | ||||
| 1Faculty of Agriculture, Ain Shams University, Cairo, Egypt | ||||
| 2Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt | ||||
| 3Central Agricultural Pesticides Laboratory, Agricultural Research Centre, Dokki, Giza, Egypt | ||||
| Abstract | ||||
| The present study was completed during three successive cotton-growing seasons (1996-1998). Monitoring the changes in the population density was achieved when number of male moths of Pectinophora gossypiella (Sound.) was considered based on pheromone trap catches. The obtained results revealed that P. gossypiella, after emerging from the diapausing stage, underwent two distinct broods; the first had two generations, while the second possessed 4-5 overlapping field generations. The 2 generations of the first brood emerged during the period from half of April till half of June and proved to be suicidal since the fruiting structures suitable for infestation are not available. The 4 generations of the second brood extended during the period from early of June to the end of December. The number and durations of generations were estimated based on both zero of development (11.97°C) and the accumulated thermal units needed for completing one generation (487 DDS). The present field and laboratory studies introduce valuable information to establish a profitable model when adopting I.P.M. programs. | ||||
| Keywords | ||||
| Pink bollworm; Pectinophora gossypiella; modeling; heat units; degree-days; zero of development | ||||
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