ABD-ALLAH, Y., EL-SAADANY, G., AMIN, A., SAYED, H. (2004). PREDICTING THE CHANGES IN THE POPULATION GROWTH PATTERNS OF THE SPINY BOLLWORM, EARIAS INSULANA (BOISD.). Egyptian Journal of Agricultural Research, 82(1), 171-181. doi: 10.21608/ejar.2004.256630
YOUSEF E. Y. ABD-ALLAH; GAMEL B. EL-SAADANY; AHMED A. AMIN; HATEM M. SAYED. "PREDICTING THE CHANGES IN THE POPULATION GROWTH PATTERNS OF THE SPINY BOLLWORM, EARIAS INSULANA (BOISD.)". Egyptian Journal of Agricultural Research, 82, 1, 2004, 171-181. doi: 10.21608/ejar.2004.256630
ABD-ALLAH, Y., EL-SAADANY, G., AMIN, A., SAYED, H. (2004). 'PREDICTING THE CHANGES IN THE POPULATION GROWTH PATTERNS OF THE SPINY BOLLWORM, EARIAS INSULANA (BOISD.)', Egyptian Journal of Agricultural Research, 82(1), pp. 171-181. doi: 10.21608/ejar.2004.256630
ABD-ALLAH, Y., EL-SAADANY, G., AMIN, A., SAYED, H. PREDICTING THE CHANGES IN THE POPULATION GROWTH PATTERNS OF THE SPINY BOLLWORM, EARIAS INSULANA (BOISD.). Egyptian Journal of Agricultural Research, 2004; 82(1): 171-181. doi: 10.21608/ejar.2004.256630
PREDICTING THE CHANGES IN THE POPULATION GROWTH PATTERNS OF THE SPINY BOLLWORM, EARIAS INSULANA (BOISD.)
1Faculty of Agricultural, Ain Shams University, Cairo, Egypt
2Plant Protection Research Institute, Agricultural Research Center, Dokki, Giza, Egypt
3Central Agricultural Pesticides Laboratory, Agricultural Research Center, Dokki, Giza, Egypt
Abstract
The current field experiments were conducted at Qalyubyia district for three successive cotton-growing seasons (1996.1998) to investigate the changes in the seasonal activity of the spiny bollworm, Earias insulana (Boisd.). The actual and expected numbers of field generations based upon both accumulated heat units (590 DDs) and zero of development (13.1°C) were estimated. Results showed that E. insulana moths underwent five overlapping field generations during each of the three tested cotton-growing seasons. The durations of these generations were as follows: 1st 10-11 weeks; ed 9-10 weeks; 3cd and 41h 8-9 weeks and 51h 8-10 weeks. On the other hand, prediction of this pest from April to next April reveals the presence of five generations on cotton plants. The duration of generations 1-3 (shortest) ranged from 40-48 days in 1996, 40-42 days in 1997 and 36-51 days in 1998, respectively. The last generation was the longest; being 157, 177 and 133 days in the three years, respectively.
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