CONTROL OF ARGENTINE ANT IN CALIFORNIA. 



39 



Fig. 18. — A citrus orchard in which clean culture is not practiced. It is difficult to obtain ant control by 

 the poisoned-sirup method on such property. 



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•v.-,\: ...... ■> >■• 



■>'••■•' *.■>■"■ ^.- ■••'. 

 ■■'■■■ - : -^>r^- 



Fig. ly.— Citrus orchard showing clean cultivation, a condition necessary if rapid ant control by the use 

 of the poisoned sirup is to be secured. 



