28 Bulletill de la Société Entomologique d'Egypte 



Control measures 



Fumigation is effective against the Hibiscus 

 iVIealy Bug but a greater dosage is required than that 

 generally used against the Black Scale of the orange. 

 It is hardly an economic proposition, however ow 

 ing to the great variation in the nature and size of 

 the trees attacked apart from any question of the cost. 



Spraying with paraffin emulsion is effective but 

 it must be accompanied by pruning. The nature of 

 (he damage caused b^ the Hibiscus Mealy Bug is so 

 to gnarl the >oung growing shoots that no spray, 

 however, applied, can be made to penetrate. It must 

 be pointed out that if the tree is reinfected by attack- 

 ed trees in the neighbourhood — and it is almost im- 

 possible to avoid it in Cairo — the last state of that tree 

 will probably be worse than the first as the insects 

 finding ihemsclves on young and tender shoots breed 

 very rapidly. Although spraying is very useful in 

 keeping down the attack it cannot be relied upon 

 for the eradiction of the pest and the replacement of 

 the more susceptible varieties of trees by those less 

 susceptible should be urged. No natural enemy has 

 been bred out in sufficient numbers to indicate that 

 any assistance can be hoped for from this quarter, 

 at any rate for the present. 



Legislation has been enacted by various arrêtés 

 issued during the last three years declaring the area 

 infected and prohibiting the transport of infected 

 plants and fruits from the infected areas and giving 

 the Ministry of \griculture power to enforce the 

 cleaning of these areas. The danger of the infected 



