Bui. 536, U. S. Dept. of Agriculture. 



Plate XVII. 







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The Prickly Pear as"a Host Fruit of the Mediterranean Fruit Fly. 



Fig. 1. — Heavily fruiting plant growing on dry arid and waste lands of the Island of Hawaii. 

 In many places this wild host, with the spiny Acacia, forms dense thickets in which the 

 fruit fly can breed. Fig. 2. — A sample of dense growth of prickly pear along the road 

 near Kailua, Hawaii. The seed pods of the algaroba tree (Prosopis juliflora) are not 

 infested. (Original.) 



