Evaluation of certain sampling methods for adults of Bemisia spp. (Homoptera: Aleyrodidae) and soybean stem fly, Melanagromyza cunctans meigen (Diptera: Agromyzidae) on soybean plantations at Mansoura district [electronic resource].

Includes references.

Sampling of Bemisia spp. and M. cunctans was carried out at 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 or~nted, one-sided traps), three colored of water pan traps (yellow, blue and red), the plastic cup trap (CC trap), sweep-net that indirectly measured adult abundance based on activity and visual examination (leave-tum) and black pan methods as two direct count sampling methods based on the census of adults on or from the plant. The count of ~isia spp. was highly significantly effect by sampling methods. Among the sampling methods, cylinder sticky traps was caught the most adults of whitefly during the two seasons. Furthennore, there were no significant differences between one sided sticky traps, CC traps, black pan, vacuum sampler, whole-plant, and leaf-turn method. In addition, there were no significant differences between cylinder sticky and' two-sided traps. The black pan had the lowest associated relative variation (RV) value in both seasons. Whereas, the whole-plant had the highest calculated RV value in the first season. While in the second season, the cylinder sticky traps had the highest calculated RV value. The black pan method had the highest calculated RNP value (most efficient) compared with all other sampling ~ methods. Whereas, the vacuum sampler had lowest associated RNV value in both seasons The count of M. cunctans was highly .Significantly effect by sampling methods. Among the sampling methods, cylinder sticky traps caught the most adult of M. cunctans during the two seasons. Furthennore, there were no significant differences between yellow water pan traps, visual examination, and sweep-net. Moreover, there was no significant differences between one sided sticky traps, whole-plant, blue water pan traps, red water pan traps and two-sided sticky traps. The cylinder sticky traps had the lowest associated RV value in 2008 season. Whereas, in 2009 season, the two-sided sticky traps had lowest associated RV value.

Summary in Arabic.

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