PLATE 1. 



a. Stages of the Red Spider (Tetruuychus telarius Linn. syn. T. btmaculatus 

 Harvey). (1) Egg. (2) Newly hatched larva having six eggs. (3) Adult 

 female. Ail highly magnified. (After McGregor, Bulletin No. -1.16, U. S. 

 Dept. of Agr.) 



b. Powdery Mildew (Erysiphe cichoracearum DC.) on leaf of cucumber, 

 showing characteristic white powdery growth. About one-half natural 

 size. 



