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Published online by Cambridge University Press: 10 July 2009
Citrus trees in Egypt suffer very severely from the attacks of scale-insects, especially the black scale, Chrysomphalus aonidum, which, when unchecked in its ravages, renders the cultivation of this crop impossible.
The usual method of control is by fumigation with hydrocyanic acid gas, which is conducted on a large scale by officers of the Ministry of Agriculture.