Recherchons expérimentateurs .....
vendredi 1er novembre 2013 -
Trouvé dans doc. anglo-saxonne,
En deux clics nous avons acquis 5 kg de sulfate de zinc pour 38,65€. Nous voulons maintenant l’expérimenter sur nos chers Red Palm Weevils en espace confiné, double serre, avec un petit groupe de pro et propriétaires.attendons vos appels au 0494416667 ou 0612996199.
Effect of Zinc Sulfate against the Red Palm Weevil Rhynchophorus ferrugineus with Reference to Their Histological Changes on the Larval Midgut and Adult Reproductive System
Abstract : The red palm weevil Rhynchophorus ferrugineus is the most important insect pest for the date palm trees in the Middle East and Gulf states. Zinc sulfate (ZnSO4·H2O) was t
oxicologically, biologically and physiologically evaluated as insect development disruptors against the RPW. LC50 of Zinc sulfate against 10 days old larvae was 0.566%, 3% concentration inhibited the larvae from feeding. LC50 concentration of zinc sulfate solution was capable to disrupting growth, development and reproduction of R. ferrugineus. Growth and development disruptions are resulted from larval feeding on the treated diet that causing percentage of mortality rate, retardation in larval and pupal duration, percentage of pupation, adults emergence, reduction in deposited eggs that laid by the resulting adults and in the egg fertility. The study further reveals that Zinc sulfate effects on histological structure of epithelial cells of the larval midgut including separation and elongation of their cells, rupture in the peritrophic membrane and in some microvilli and some degeneration of the surrounding muscles. Histological changes also was observed on the adults ovary, in this way, disrupt female gamete production through their action on the accumulation of yolk granules (vitellogenesis) and follicular epithelial cells. Disruption of male gamete production was detected by disorganized of testicular cysts and depopulation of these cysts in addition to degeneration in germ cells. Zinc sulfate may be used among other control methods by injection into the tree trunk or as fertilizer around the tree roots which in turn may have an indirect effect for controlling the RPW.
Key words : Red palm weevil, zinc sulfate, inorganic salt, toxicity, growth disruption, histological changes, midgut, ovary, testes, Rhynchophorus ferrugineus.