THE EED SPIDER ON THE AVOCADO. 



9 



(Fig. 5.) During the summer in Florida drenching and frequent 

 rains usually prevent the red spiders from establishing themselves 

 on the trees. During late fall and Avinter and early spring it rains 

 seldom, and the interference with the activities of the red spider is 

 slight. 



PREDATORY ENEMIES. 



A number of predatory enemies of the avocado red spider aid at 

 various times in keeping down the species on the avocado to a small 

 deofree. 



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Fig. 5. — Precipitation chart for the years 1918 and 1019 in southern Florida. 



ScolotJirips sexmacuJatus Pergande is one of the predatory thrips 

 and is not abundant during the height of the red-spider season. 

 Nevertheless it is present doing its share of destruction. It is a light- 

 colored thrips possessing six dark spots on its body. It feeds on the 

 red spiders in both the larva and adult stages. 



Chrysofa lateralis Guer. is one of the so-called lace-wing flies and 

 is predatory in the larva stage on the red spider. The larvse, while 

 feeding and wandering about the foliage in search of their prey, 

 carry with them a protection consisting of foreign material, such as 

 cast red spider skins, etc. The larvse have a voracious appetite and 



