Effect of feeding by two Neochetina species or infestation with Tetranychus urticae Koch on histological structure of water hyacinth leaves

Publication Type:Journal Article
Authors:A. A. A. El-Zoghby, Ali, F. S., Bakr, M. H. A. Abo, Mahgoub, M. H.
Journal:Egyptian Academic Journal of Biological Sciences A Entomology
Date Published:2009
:Neochetina bruchi, Neochetina eichhorniae

Both weevils, Neochetina bruchi (Hustache) and Neochetina eichhorniae Warner feed on water hyacinth plants as a biocontrol agents. Tetranychus urticae Koch infested the plants grown under light and thermostatic controlled aquatic weed green house, and caused repellency of the weevils. Studying some histological structure, of water hyacinth leaves infested with mites, showed increase of the thickness of upper epidermis, number of palisade cell and thickness of leaf petiole, compared with the control and leaves infested with weevils which recorded decrease in the thickness of leaf petiole and increase in lower palisade tissue. The mites infested plants lost chlorophyll, turned brownish and lost size of vacuoles or air chambers used to store the oxygen. The volume of these vacuoles was very small in case of mite infested plants compared with leaves infested with weevils as the same as control. The weevils feeding reflected in increase in both, length and width of fed upon leaves.

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