B-The seasonal abundance of the stages of Ceroplastes Cirripediformis infesting guavas in the governorate of Qaliobiya during the two years studied (from mid-January 2005 to January 1, 2007) is presented in tables (XIII and XIV) and figures (81-84): Seasonal fluctuation of pre-adult: The data from the previous tables and figure (81) illustrate the dynamic curve of Cer. cirripediformis, it had only two peaks. While the first peak occurred in mid-February, averaging (118-150 pre-adults/leaf) and the second peak was (114-358 pre-adults/leaf) in mid-November during the two years studied respectively. Furthermore, the results clearly showed that there was a long period of depression that began from mid-March to October 1. Seasonal fluctuation of adult females: Data from the same tables and figure (82) indicated that, the greatest frequency occurred during October 1st. reaches 20 adults/leaf; disappeared during interrupted periods. Seasonal Fluctuation of Gravid Female: Examination of the data presented in the tables and figure (83) revealed that gravid females have two annual peaks during the two years of study. The highest peak obtained in October and November reaches 15 gravid females/leaf during the second year. Seasonal fluctuation of Cer. cirripediformis total population: data summarized in the two previous tables and graphically illustrated in the published figure (84) of the presence of two distinct peaks each year. The first peak recorded in mid-February with (121,157 insect/leaf) and the second peak recorded in mid-November with (115,137 insect/leaf) during the two years studied respectively. On the other hand, there was a long period of depression during the two years studied which began from mid-March until ...... middle of article ......hs 1142006 Season 1st generation From mid-January to July 1, 2006 5.5 months 1502nd generation From July 1 to mid-January 6.5 months 358Table (XVI): simple correlation and partial regression of six abiotic and biotic factors with their significant level and their percentage of variance explained on the population density of the population of Ceroplastes cirripediformis in the governorate of Qaliobiya during the period of investigation.EV%F.valuepartial regressionsimple correlationsource of variationyeartpbR57.90%3.889**-2.8880.01-3.98- 0.576*MAX. Temp2005-20060.5330.6010.416-0.263Min. Temp0.2930.7730.3520.124 daily averageR.H%-0.950.355-2.473-0.125Precipitation-1.0290.318-3.932-0.417*wind speed-1.5740.1344.2560.584*parasite