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

ِAmal El -Zoghby,Mahgoub H,Abo Bakr A,Fatma Ali

doi:10.21608/eajbsa.2009.15453

ِAmal El -Zoghby, Mahgoub H + Show 2 more

Open Access

https://doi.org/10.21608/eajbsa.2009.15453

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Abstract

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 chlo rophyll, 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.

Highlights

Water hyacinth creates serious problems in Egypt
Samples of leaves infested with mites and insects: Three samples of water hyacinth leaves were taken from greenhouse of aquatic weeds of the Department of Biological Control
Fig. (1) clears that the increase of the thickness of upper palisade tissue (9-12) and lower (5-6) layers in case of mites because it increase in the number of the cells. and (The percentage of measurements were recorded for upper and lower palisade tissue, where mites infected plants showed an increase by 35.6 and 70.9%, while insect infested ones recorded 34.4 and 91.0%, compared with control plant (F=192.00 and P = 0.0001) and (F= 686.49 and P= o.ooo1) respectively

Summary

Introduction

Water hyacinth creates serious problems in Egypt. The weed affects irrigation, water use, and navigation but it poses health risks by enabling the breeding of mosquitoes and schistomes (bilharzias) and other human parasites. El-Zoghby et al (2008) found that T. urticae when infested water hyacinth plants caused changes in leaf contents.

Results

Conclusion