Silicon derivatives induced host plant resistance against Tetranychus urticae (Acari: Tetranychidae) in eggplants farms Author Ismail, Manal S. . Vegetable and Ornamental Plant Mites Department, Plant Protection Research Institute, Agricultural Research Center (ARC), Giza, Egypt; E-mails: manal _ sayed 99 @ hotmail. com, asmaaabdallah 0 @ gmail. com Author Abdallah, Asmaa M. . Vegetable and Ornamental Plant Mites Department, Plant Protection Research Institute, Agricultural Research Center (ARC), Giza, Egypt; E-mails: manal _ sayed 99 @ hotmail. com, asmaaabdallah 0 @ gmail. com Author Aboghalia, Ahmed H. Zoology Department, Faculty of Science, Suez Canal University, Ismailia, Egypt; E-mail: ahaboghalia @ yahoo. com ahaboghalia@yahoo.com text Persian Journal of Acarology 2022 2022-10-15 11 4 681 693 journal article 10.22073/pja.v11i4.75245 2251-8169 7447420

Table 1. Linear regression between Si leaf content and Tetranychus urticae population density, activities of POD, CAT, PPO, total protein and phenol contents of OSAB and Silica K-treated plants.

Parameters	R	OSAB R 2 Regression equation		R	Silica K R 2 Regression equation
(*) Correlation is significant at the 0.05 level (2-tailed) (**) Correlation is significant at the 0.01 level (2-tailed)
T. urticae density	−0.988**	0.975	y = −0.671x + 83.24	−0.791*	0.625	y = −1.023x + 100.63
POD activity	0.857**	0.734	y = 0.710x − 1.06	0.933**	0.871	y = 1.940x - 80.64
CAT activity	0.866**	0.749	y = 0.044x - 1.25	0.940**	0.884	y = 0.034x − 0.42
PPO activity	0.896**	0.802	y = 0.113x + 4.55	0.680*	0.462	y = 0.111x + 5.79
Protein Cont.	0.918**	0.842	y = 0.037x − 1.09	0.854**	0.730	y = 0.042x − 1.29
Phenol Cont.	0.803**	0.645	y = 0.015x − 0.08	0.676*	0.457	y = 0.020x − 0.13