Twenty sorghum cultivars were compared in respect to their susceptibility to the twospotted spider mite, Tetranychus urticae Koch infestation under natural infestation. Statistical analysis showed that the mite level infestation could be divided into four categories :- The cultivars; Fam. 334; local 216 / 77,local 218 / 77 and local 219 / 77 were highly susceptible. The cultivars; local 1 / 82, local 235 / 77, local 239 / 77, local 6 / 82, local 4 / 82 and local 10 / 82 were susceptible to spider mite infestation; the cultivars; Giza 15, Sel. G. 111, local 1 /89, local 56/82, local 53 / 82, local 36/ 82 and local 31 /82 were moderately susceptible; and the cultivars; local 129 and Sel. 113 expressed resistance.
Nitrogen fertilizer influenced mite development. Nitrogen alone increased mite population densities more than with potassium alone or potassium and nitrogen together.
Species 1: Acari Tetrancaide Tetranychus urticae (twospotted spider mite)
Keywords: Susceptibility, Sorghum
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