METWALLY, E., EL-GHONAMY, A., MOAWAD, G., RASLAN, S., DESUKY, W. (1996). HEAT UNIT AND WEATHER FACTORS IN RELATION TO PREDICTION OF THE PINK BOLLWORM INFESTATION. Egyptian Journal of Agricultural Research, 74(4), 939-955. doi: 10.21608/ejar.1996.431745
EL-SAYED M. METWALLY; ABDEL-RAHMAN I. EL-GHONAMY; GALAL M. MOAWAD; SAMY A. RASLAN; WAHED M. H. DESUKY. "HEAT UNIT AND WEATHER FACTORS IN RELATION TO PREDICTION OF THE PINK BOLLWORM INFESTATION". Egyptian Journal of Agricultural Research, 74, 4, 1996, 939-955. doi: 10.21608/ejar.1996.431745
METWALLY, E., EL-GHONAMY, A., MOAWAD, G., RASLAN, S., DESUKY, W. (1996). 'HEAT UNIT AND WEATHER FACTORS IN RELATION TO PREDICTION OF THE PINK BOLLWORM INFESTATION', Egyptian Journal of Agricultural Research, 74(4), pp. 939-955. doi: 10.21608/ejar.1996.431745
METWALLY, E., EL-GHONAMY, A., MOAWAD, G., RASLAN, S., DESUKY, W. HEAT UNIT AND WEATHER FACTORS IN RELATION TO PREDICTION OF THE PINK BOLLWORM INFESTATION. Egyptian Journal of Agricultural Research, 1996; 74(4): 939-955. doi: 10.21608/ejar.1996.431745
HEAT UNIT AND WEATHER FACTORS IN RELATION TO PREDICTION OF THE PINK BOLLWORM INFESTATION
1Plant Protection Department, Faculty of Agriculture, Zagazig University, Egypt
2Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt
Abstract
The relationship between the population dynamics of P.gossypiella and weather factors were studied in Diarb Nigm and Faquss Districts, Sharkia Governorate during 1989, 1990, and 1991 seasons. The results indicated that the population dynamics of pink bollworm at Faquss District was higher than that found at Diarb Nigm District. The activity of pink bollworm moths could be divided into three main periods during each year; the first period occurred before the formation of fruit bodies on cotton plants. The second period involves the generations of the pest which infest cotton plants. The third period is the late activity period in which the pest occurred in the host plants. The results .obtained by Explained Variance (E.V.) of maximum temperature, relative humidity, sun shine and rain fall indicated the imprtance of all these environomental factors on the activity and the number of pink bollworm moths except for the rain fall wheras no corre-lation was found between this factor and the insect acivity. There were positive correlations between the number of pink bollworm moths and the thermal heat units expressed as daily degree till July during the three years with the exception of the year 1991 where the number of trapped moths decreased during July as compared with those during June. The total numbers of cauht moths in Faquss District were higher than those of Diarb Nigm. The highest numbers of the trapped moths were obtained during September where the thermal heat units ranged from 827 to 895 daily degrees. There were high reductions in the trapped moths starting from October where the thermal heat units ranged from 779 to 820 daily degrees followed by a great reduction during November where the thermal heat units ranged from 538 to 678 daily degrees.
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