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Samplings of S. syriacus and C. undecimpunctata were carried out in Mansoura district, Dakahlia Governorate during 2008 and 2009 seasons. We examined several types of yellow sticky cards (vertically oriented cylinder, vertically oriented, two-sided traps and vertically oriented, one-sided traps) and sweep-net thin indirectly measured adult abundance based on activity and visual examination and whole-plant methods as two direct count sampling methods based on the census of adult on or from the plant. The count of predator, S. syriacus was highly significantly effect by sampling methods. Sweep-net count more significant adult of S. syriacus than the other sampling methods during 2008 and 2009 seasons. Furthermore, in 2008 season, there were no significant notes between one sided sticky trap and whole-plant. In addition, there was no significant between cylinder sticky trap and two-sided sticky trap. In 2009 season, there was no significant between cylinder sticky trap, one sided sticky trap, and visual examination. The relative variation of the sweep-net and one-sided sticky trap methods were significantly less than the other methods for sampling S. syriacus. Therefore, it is the optimum sampling methods and indicated greater precision for sampling S. syriacus. Sweep-net recorded the highest RNP compared with the other sampling methods. This indicated thin the sweep-net is the greater sampling efficiency. The count of C. undecimpunctata was highly significantly effect by sampling methods in 2008 and 2009 seasons. Visual examination count more insects than sweep-net and whole-plant during 2008 and 2009 seasons. Visual examination had the lowest associated RV value in the first and second seasons (10.90 and 9.61, respectively). Visual examination had the highest calculated RNP value (most efficient) compared with all other sampling methods in the first and second seasons.

journal of plant protection and pathology /journal of plant protection and pathology

COMPARISON OF SOME SAMPLING METHODS FOR ADULTS OF Scymnus syriacus AND Coccinella undecimpunctata (COLEOPTERA: COCCINELLIDAE) ON SOYBEAN PLANTINIONS IN MANSOURA DISTRICT.