Weed risk analysis and assessment of weed seed consignment with imported grains [electronic resource].

Includes reference.

This is a pioneer work for weed risk analysis in Egypt, where 1334 samples of imported grains in the period from 1/3/2009 to 1/3/2010 were used to detect weed seed consignment in imported grain shipments as well as to estimate weed risk assessment of the main four weed species, namely wild oat (Avena spp.), rye grass (Lolium temulentum), field bindweed (Convolvulus arvensiS') and ragweed (Ambrosia artemisllfolia), giant ragweed (Ambrosia trlf/da) as alien weed on agriculture in Egypt. Results indicated that 91.1% off samples contaminated with weed seeds less than the permissible level (> 24 seeds/kg of grains) and were accepted. Meanwhile, the rest of samples had more than this level «25 ¬996 seeds/kg) and were refused to be screened at the pennissible level. Weed risk analysis scores for the above mentioned four species indicated that the probability of their entry was 6.3, 6.3 and 5.6, establishment was 6.6,7.5 and 6.4 and the economic impact was 5.6, 4.9 and 4.3 for wild oat, rye grass and field bindweed respectively (the maximum score =9). For the genus of Ambrosia, it has three species, common ragweed (Ambrosia artemisilfolla), giant ragweed (Ambrosia trifida) and perennial ragweed (Ambrosia psilostachya) were frequently detected in imported wheat, maize and sorghum seeds and seen to possess the highest potential! phytosanitary risk for Egypt.

Summary in Arabic.

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