Communications Internationales
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Item Association of oxalic and lactic acid for varroa control in Algeria August 2010(2010) Adjlane, NoureddineToday, the chemical control of Varroa with pyrethroids is difficult, as they are no longer effective. Thus, it is interesting to use natural products such as organic acids. Oxalic and lactic acid were used for the first time in Algeria on 30 colonies of Apis mellifera intermissa in Langstroth hives: A. 45 g of oxalic acid dehydrate dissolved 1 litre 50 % sucrose syrup B. 30 g of oxalic acid dehydrate dissolved 1 litre 50 % sucrose syrup C. Two applications with 5 ml 15 % lactic acid carried out by pouring the acid between the frames, with a 7 day interval Dead Varroa were counted during the trial period by means of greased bottom inserts covering the hive bottom two weeks after the use of the organic acids. The efficacy of the oxalic lactic acid depends on the presence of brood at the time of the treatment. Following efficacies were measured: Application A.: 82.6 %, application B: 65.5% and application C: 75.23 %. Organic acids must be considered as products for integrated Varroa control in AlgeriaItem Efficacy of Varroa destrcutor treatments in Algeria(2011) Adjlane, Noureddine; Jamal Haddad, NizarVarroa destructor was registered for the first time in Algeria in 1981 through the Algerian-Tunisian border to the east. Since then Algeria has approved the use of several products to control varroa, in order to minimize the impact of this parasite on the bee colonies and honey production. This experiment was conduted in order to study current effectiveness of varroa treatments registered in Algeria,varroa resistant to these treatments ,The trials were conducted in the region of Mitidja (central Algeria) on 75 hives spread over three apiaries. All colonies where equipped with a mesh tray with insert as a diaper greased roasting for counting dead mites. The control treatment is performed with oxalic acid drip; effectiveness was measured by comparing the mites killed during the experimental treatments to mites killed during a control treatment. The results showed a variation in efficacy between the treatments used Bayvarol saves the efficiency ratio is the most important (94.33%), followed Apistan and Apivar with 87.54% and 82.67% respectively. We note a decrease in the efficiency of these products, tests for resistance in vitro are needed to confirm this decline and to detect possible problem of resistance. Natural treatments based on thymol record the lowest with 79.34% for and 72.65% for Thymovar and Apigaurd. Thymol as Apiguard and Thymovar can be regarded as complementary therapies to be integrated into a control program because the success rate is low and thus the beekeeper is required to use an alternative treatment. The information obtained from this study concerning drug efficacy and resistance acaricides are essential for defining the control strategies adapted to the therapeutic treatment of Varroa disease in Algeria.Item Occurrence of nosemosis in honeybee colonies Apis mellifera intermissa in the Mid-North of Algeria during 2011.(2012) Adjlane, Noureddine; Jamal Haddad, Nizar