Some Aspects Of The Biology And Control Of The Water Hyacinth (Eichhornia Crassieps (Mart.) Solm.)

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Lutfi Abdel Gadir Desougi
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University of Khartoum
The bladder formation in the petiole of Eichhornia crassipes is governed by crowdness. The scarcity of fruit setting near Khartoum is due to low relative humidity, high temperature and absence of a pollinating agent. The high rate of vegetative propagation and the wide distribution of the weed were recorded as well as the harmful effect of the plant, an alarm of further infestation on the Nile system and the presence of the rare short stylic flower. The water content and the critical water content essential for survival of the plant were found to be 91.7% and 16% respectively. The sequence of water loss and the diurnal changes in transpiration rate were found to be a function of the prevailing climatic conditions. Loss of water caused by E. crassipes growing on water or in the soil was greater than that caused by either of the aquatic weeds; Pistia stratiotes, Ceratophyllum sp. and a linear relationship between increase in size of E. crassipes and loss of water. A general survey of control methods was made. The effectiveness of 2, 4 –D over other chemicals was affirmed as well as its effects when sprayed in sub-lethal doses and when it comes in contact with the roots of E. crassipes. Temperature, relative humidity and rain were found to greatly affect the control methods.
stylic flower Biology Water Hyacinth Botany University of Khartoum
Lutfi Abdel Gadir Desougi, Some Aspects Of The Biology And Control Of The Water Hyacinth (Eichhornia Crassieps (Mart.) Solm.) .- Khartoum : University of Khartoum, 1974 .- illus., 28cm., M.Sc