Susceptibility of Four Watermelon Cultivars to Infestation with Tetranyclws urticae Koch.
El-Saiedy, E., Afifi, A., Ali, F., Ahmed, M. (2011). Susceptibility of Four Watermelon Cultivars to Infestation with Tetranyclws urticae Koch.. EKB Journal Management System, 5(1), 23-28. doi: 10.21608/ajesa.2011.163603
E. M. El-Saiedy; A. M. Afifi; Fatma S. Ali; M. M. Ahmed. "Susceptibility of Four Watermelon Cultivars to Infestation with Tetranyclws urticae Koch.". EKB Journal Management System, 5, 1, 2011, 23-28. doi: 10.21608/ajesa.2011.163603
El-Saiedy, E., Afifi, A., Ali, F., Ahmed, M. (2011). 'Susceptibility of Four Watermelon Cultivars to Infestation with Tetranyclws urticae Koch.', EKB Journal Management System, 5(1), pp. 23-28. doi: 10.21608/ajesa.2011.163603
El-Saiedy, E., Afifi, A., Ali, F., Ahmed, M. Susceptibility of Four Watermelon Cultivars to Infestation with Tetranyclws urticae Koch.. EKB Journal Management System, 2011; 5(1): 23-28. doi: 10.21608/ajesa.2011.163603

Susceptibility of Four Watermelon Cultivars to Infestation with Tetranyclws urticae Koch.

Acarines: Journal of the Egyptian Society of Acarology
Article 6, Volume 5, Issue 1, 2011, Page 23-28  XML PDF (4.69 MB)
Document Type: Original research articles
DOI: 10.21608/ajesa.2011.163603
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Authors
E. M. El-Saiedy1; A. M. Afifi2; Fatma S. Ali2; M. M. Ahmed2
1Plant Protection Dept., National Research Center, 12622 Dokki, Giza, Egypt
2*zoology and Agric. Nematology Dept., Faculty of Agriculture, Cairo Univ., Giza. Egypt
Abstract
Experiments were conducted to estimate the susceptibility of four watermelon cultivars (Aswan, Daytona, Molokai and Giza-I) to infestation with Tetranychus urticae Koch and its population fluctuation during the two successive seasons, summer 2009 and early summer 20 I 0 at Qalubia Governorate. Aswan cultivar was the most highly susceptible recording average of 42.86 and 57.59 mite moving stages/leaf during the two successive seasons, respectively, followed by the moderately infested cultivars (Daytona) recording 28.10 and 39.75 mite individuals during the two seasons, respectively. The lowest infestation was recorded on Molokai and Giza-1 cultivars, being 19.18 & 25.90 for the former and 18.10 & 25.94 for the latter cultivar during the two successive seasons, respectively. Susceptibility of watermelon cultivars to infestation with T. urticae may be affected by plant leaf morphological structure and its chemical contents. The number of trichomes/cm2 leaf averaged 647.78, 744.44, 1111.11 and 1296.67 for Aswan, Daytona, Molokai and Giza-1 respectively, the less number of trichomes the more mite infestation. Positive relationships occurred between mite infestation levels and total amino acids, free amino acids, nitrogen and total soluble sugars in watermelon cultivars, while negative relationship found with tannins and nearly shown with total phenolic compounds, total flavonoids and total carotenes. Mite populations reached its peak during July and May in the first and second seasons, respectively, and infestation was lower in the first season than in the second, which might be due to early plantation.
Keywords
Susceptibility; Host plant resistance; watermelon cultivars; Population dynamics; Tetranychus urticae
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