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ROFAIL, M., EL-SORADY, A., RASHAD, A. (1998). COMPARATIVE CYTOLOGICAL STUDIES ON A SUSCEPTI‌BLE AND RESISTANT STRAINS OF PINK BOLLWORM, PECTINOPHORA GOSSYPIELLA MUND.). Egyptian Journal of Agricultural Research, 76(2), 535-543. doi: 10.21608/ejar.1998.347303
MONA F. ROFAIL; ABDEL-SALAM E. M. EL-SORADY; AMIRA M. RASHAD. "COMPARATIVE CYTOLOGICAL STUDIES ON A SUSCEPTI‌BLE AND RESISTANT STRAINS OF PINK BOLLWORM, PECTINOPHORA GOSSYPIELLA MUND.)". Egyptian Journal of Agricultural Research, 76, 2, 1998, 535-543. doi: 10.21608/ejar.1998.347303
ROFAIL, M., EL-SORADY, A., RASHAD, A. (1998). 'COMPARATIVE CYTOLOGICAL STUDIES ON A SUSCEPTI‌BLE AND RESISTANT STRAINS OF PINK BOLLWORM, PECTINOPHORA GOSSYPIELLA MUND.)', Egyptian Journal of Agricultural Research, 76(2), pp. 535-543. doi: 10.21608/ejar.1998.347303
ROFAIL, M., EL-SORADY, A., RASHAD, A. COMPARATIVE CYTOLOGICAL STUDIES ON A SUSCEPTI‌BLE AND RESISTANT STRAINS OF PINK BOLLWORM, PECTINOPHORA GOSSYPIELLA MUND.). Egyptian Journal of Agricultural Research, 1998; 76(2): 535-543. doi: 10.21608/ejar.1998.347303

COMPARATIVE CYTOLOGICAL STUDIES ON A SUSCEPTI‌BLE AND RESISTANT STRAINS OF PINK BOLLWORM, PECTINOPHORA GOSSYPIELLA MUND.)

Article 9, Volume 76, Issue 2, July 1998, Page 535-543  XML PDF (2.63 MB)
Document Type: Original Article
DOI: 10.21608/ejar.1998.347303
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Authors
MONA F. ROFAIL; ABDEL-SALAM E. M. EL-SORADY; AMIRA M. RASHAD
Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt
Abstract
The parent strain of Pectinophora gossypiella (Saund.) was col­lected from cotton fields and reared in the laboratory for several genera­tions free from insecticidal pressure. Selection of newly hatched larvae with cyanophos for 24 generations resulted in a 32.51-fold increase in resistance. Cytological behaviour of chromosomes in meiotically dividing cells was studied at the 24th selected generation. Also, the cytological aber­ration in relaxed strain for one generation was studied. Results show that the percentage of abnormal cells was 26.087 at the 24th selected generation. Relaxed strain showed a slight decrease of percentage of abonormalities (22%) as compared with the suscepti­ble strain (2.8). The most frequent chromosomal aberrations were stick­iness of chromosomes and lagging chromosomes. Irregular distribution of chromosomes was also observed in a few cells.
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