Population Density, Economic Threshold and Injury Levels of Tetranychus urticae and Petrobia tritici Infesting Wheat Plants at Sharkia and Beheira Governorates, Egypt
Abstract:Assessment of the economic damage threshold (ETL) and economic injury level (EIL) of the two tetranychid Tetranychus urticae and Petrobia tritici infested wheat (Giza 168) were studied during 2016/2017 season at Sharkia and Beheira governorates. Also, the population density of both mite species were estimated. Results cleared that the values of (ETL) were less than (EIL) level. The (ETLs) values of T. urticae on wheat plants at Beheira and Sharkia (as x1 &x2 peaks results) ranged 4-4.33 and 4.33-10 individuals… Show more
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