The Avocado: Its Insect Enemies. 923 
The red spiders and thrips usually start work at the base of the 
leaf, and as the succeeding generations appear they extend their feed- 
ing grounds until the entire leaf is infested. The first indication of 
red spiders and thrips on the foliage is the pale spots scattered about 
over the leaf surface. These represent the feeding places, and as 
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Ftc. 19.—The avocado leaf-infesting thrips: Damage to upper surface of avocado foliage. 
they become numerous most of the functional green matter in the leaf 
is absorbed, and in time such a leaf turns brown and is of little use 
to the tree. Usually the red spiders and the thrips do not work on the 
same leaf. The attacks of the thrips have not been found by the 
writer to be as severe as those of the red spider. The leaf-infesting 
