Bui. 924, U. S. Dept. of Agriculture. 



Plate I!. 



Fig. I.— Damage to Grapefruit by Rust Mites. 



Dark tear stains are found frequently on areas more or less russeted 

 by rust mites, especially where" the applications of rust-mite 

 sprays were delayed. For all practical purposes, both tear-stain 

 and russeting are. absent from fruit kept free from rust mites. 

 Note the zone of faint russet. 



Fig. 2.— The Work of Rust Mites on Grapefruit Sprayed in June 

 with Bordeaux Mixture. 



In the zone of rust-mite activity injury is confined to the area not covered with spray. 

 Near-by grapefruit trees sprayed on the same date with lime-sulphur solution (1-66) 

 matured fruit entirely free from russeting or tear-stain. 



