WORLD JOURNAL OF ENVIRONMENTAL BIOSCIENCES
WORLD JOURNAL OF ENVIRONMENTAL BIOSCIENCES
2018 Volume 7 Issue 2

Annual and Stationary Variation of Black Rat Rattus Rattus (Linnaeus, 1758) Damage On Date Palm Inflorescences in Southeastern Algeria


Zeïd Alia, Djilani Ghemam Amara, Ahmed Elkhalifa Chemsa, Amar Eddoud, Karim Souttou, Makhlouf Sekour
Abstract

The estimated damages caused by Rattus rattus on Phoenix dactylifera (L. 1753) involved 25 sites distributed equally over 5 stations in the Souf region (south-east of Algeria). The first traces of the damages could be summed up in a deterioration of the inflorescences (spathes) before and after their openings. However, a five-year follow-up (from 2012 to 2016) revealed that 2014 (63.7±8.0 %) was the year with the highest loss rates ranging from 51.4 % to 81.2 %. On the other hand, the lowest rates were recorded in 2016 (20.5±5.4 %) with values varying between 9.5 % and 21.9 %. Depending on the stations, the highest attacks were observed in station 5 with 39.7±16.6%. On the other hand, the lowest rates were recorded in station 3 with 23.1±11.3%. Regarding the evolution of attacks, open inflorescences (29.7±19.9%) were relatively more attacked than the closed inflorescences (20.4±14.9%).


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