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Journal of Biological Sciences
  Year: 2007 | Volume: 7 | Issue: 6 | Page No.: 1017-1037
DOI: 10.3923/jbs.2007.1017.1037
 
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Histological and Ultrastructural Changes Induced by Two Carbamate Molluscicides on the Digestive Gland of Eobania vermiculata
Sherifa S. Hamed, Nabila E. Abdelmeguied , Amina E. Essawy , Mohamed A. Radwan and Amira E. Hegazy

Abstract:
Terrestrial snails are destructive agricultural pests as they cause a great damage to vegetables and crops. The present study was designed to evaluate the toxic action of two carbamate molluscicides, methomyl and methiocarb on the digestive gland of the land snail E. vermiculata which is the main site of accumulation and biotransformation of xenobiotics, using topical application and baiting techniques. Sublethal doses and concentrations of both pesticides were applied. After 1, 3, 5, 7 and 14 days of treatment, definite number of snails from each group were chosen and prepared for the aimed studies. Histopathological and ultrastructural alterations in the digestive gland were more obvious after topical application than after baiting technique and methomyl was found to be more toxic than methiocarb. These alterations included hemocyte infiltration,bizarre nuclei that ranged in their degenerative changes from karyolysis to severe karyorrhexis and complete pyknosis, after methomyl treatment and extensive destruction and disorganization of the intertubular connective tissue, after methiocarb treatment. In addition, severe cytoplasmic vacuolization, disruption and reduction of microvilli and formation of surface blabs, increased number of calcium spherules in calcium cells and an aberrant increase in the number of excretory cells containing large number of excretory granules or residual bodies were observed after treatment with both molluscicides. These results are important from the economical point of view since the use of low doses of molluscicides was shown effective, more feasible and less harmful to non-target species like vertebrate animals and human beings.
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How to cite this article:

Sherifa S. Hamed, Nabila E. Abdelmeguied , Amina E. Essawy , Mohamed A. Radwan and Amira E. Hegazy , 2007. Histological and Ultrastructural Changes Induced by Two Carbamate Molluscicides on the Digestive Gland of Eobania vermiculata . Journal of Biological Sciences, 7: 1017-1037.

DOI: 10.3923/jbs.2007.1017.1037

URL: https://scialert.net/abstract/?doi=jbs.2007.1017.1037

 
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