Bakry, M., Tolba, E. (2025). Occurrence of Fiorinia phoenicis (Hemiptera - Diaspididae) Population on Date Palm Trees Based on Climatic Variables Applying Regression and Principal Component Analyses. Journal of Plant Protection and Pathology, 16(3), 125-135. doi: 10.21608/JPPP.2025.360414.1316
M. M. S. Bakry; Eman F. M. Tolba. "Occurrence of Fiorinia phoenicis (Hemiptera - Diaspididae) Population on Date Palm Trees Based on Climatic Variables Applying Regression and Principal Component Analyses". Journal of Plant Protection and Pathology, 16, 3, 2025, 125-135. doi: 10.21608/JPPP.2025.360414.1316
Bakry, M., Tolba, E. (2025). 'Occurrence of Fiorinia phoenicis (Hemiptera - Diaspididae) Population on Date Palm Trees Based on Climatic Variables Applying Regression and Principal Component Analyses', Journal of Plant Protection and Pathology, 16(3), pp. 125-135. doi: 10.21608/JPPP.2025.360414.1316
Bakry, M., Tolba, E. Occurrence of Fiorinia phoenicis (Hemiptera - Diaspididae) Population on Date Palm Trees Based on Climatic Variables Applying Regression and Principal Component Analyses. Journal of Plant Protection and Pathology, 2025; 16(3): 125-135. doi: 10.21608/JPPP.2025.360414.1316
Occurrence of Fiorinia phoenicis (Hemiptera - Diaspididae) Population on Date Palm Trees Based on Climatic Variables Applying Regression and Principal Component Analyses
1Scale Insects and Mealybugs Research Dept., Plant Protection Research Institute, Agricultural Research Center, 12619 Giza, Egypt;
2Plant Protection Dept., Faculty of Agric, New Valley University, New Valley, Egypt
Abstract
The investigation focuses on evaluating the impact of climatic conditions on the population ecology of the fiorinia date scale (FDS), Fiorinia phoenicis Balachowsky (Hemiptera: Diaspididae), applying regression and principal component analyses. This work was executed in a private date palm plantation in the El-Bayyarah region, Kom Omboo area, Aswan governorate, southern Egypt. According to the results, there were four yearly seasonal activity peaks for F. phoenicis individuals on date palm trees: mid-April, mid-June, early September/October, and mid-November. These individuals were found on date palm trees all year round. The calculated numbers of F. phoenicis were significantly impacted by the combined impacts of the climatic factors, which differed from year to year. The two years' explained variations in population estimates, as determined by the multiple regression approach, were 60.56% and 71.61%, respectively. The most significant variable that explained differences in the overall estimates of F. phoenicis in both years was solar radiation. However, the variable that had the least impact on population fluctuations over the two years was the daily mean lowest temperature.The principal components analysis produced two components (PC1 and PC2) with eigenvalues larger than 1, which explained 96.02% and 93.4% of the variation overall across the two years, respectively. The daily mean maximum and lowest temperatures, relative humidity, and solar radiation were the environmental factors for PC1 and PC2. In both years, PC1 comprised 72.81% and 72.76% of the variation, respectively, whilst PC2 comprised 23.21% and 20.64% of the variance, respectively.
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