Effect of climate and aspect on the population dynamics of the olive scale (Parlatoria oleae: Hemiptera, Diaspididae) under arid conditions [Effet du climat et de lexposition sur la dynamique des populations de la cochenille violette, Parlatoria oleae Colvée (Hemiptera: Diaspididae), en conditions arides]
Chafaa S.,University of Batna |
Biche M.,Ecole Nationale Superieure Agronomique El Harrach |
Chenchouni H.,University of Tébessa |
Sellami M.,Ecole Nationale Superieure Agronomique El Harrach |
Si Bachir A.,University of Batna
Annales de la Societe Entomologique de France | Year: 2013
This work aims to study some bio-ecological aspects of the olive scale Parlatoria oleae: Colvee 1880, bio-aggressor of olive cultures in arid area. The monitoring of biological cycle and the demo-ecology of this pest have been achieved through periodic population counts on different parts of the tree (method of Vasseur and Schvester) from December 2010 to December 2011 in the region of Ain Touta (north-eastern Algeria). In the region of study, the species had two generations a year: a spring generation that occurred from April to July and a fall generation that evolved from August to October. Egg laying began in April and lasted until the end of September. The most favourable exposition for this insect was North. Egg laying average was 8 to 9 eggs per female. Statistical analysis showed that the effects of the studied climatic conditions (minimum, maximum and average temperatures, precipitation, frost and De Martone's aridity index) on population size during the different stages were very variable. The number of individuals showed statistically highly significant variations according to the exposition on the trees. 2013 © Société entomologique de France.
Scientific note on side effectsof oxalic acid on the worker bee (Apis mellifera): Biochemical aspect) [Note scientifique sur les effets secondaires de lacide oxalique sur labeille ouvrière (Apis mellifera ) : Aspect biochimique]
Adjlane N.,University of Boumerdès |
Chahbar N.,University of Boumerdès |
Maidi A.,University of Boumerdès |
Doumandji S.,Ecole Nationale superieure agronomique El Harrach |
Haddad N.,National Center for Agriculture Research and Extension
Journal of Materials and Environmental Science | Year: 2013
Oxalic acid is considered as widely used method for treatment against varroa destructor mite,this mite causes a considerabledisorder to honeybees comparing with other bee diseases. Where as the usage of Oxalic acid may causes a weakening of bee coloniesas a side effect. This study aims to determine the effects of oxalic acid on thebiochemical aspect of the honeybee Apis mellifera,bystudying the variations in the content of differentmetabolites of the body and hemolymph (proteins, lipids and carbohydrates). Treatment with oxalic acid disrupts the metabolism of the bee, the results show that it causes a drop in carbohydrate and fat and increased protein levels in the body and the hemolymph. These findings may explain cases of weakness reported by beekeepers afterapplication of this treatment.