THE RED SPIDER ON COTTON. A 
Carolina. Considering the fact that North Carolina, Georgia, Ala- 
bama, and Mississippi are known to suffer from the pest practically 
to the same degree as does South Carolina, it is within all probability 
that the Southeast, during a severe red-spider year, may suffer a loss 
of $2,000,000 from the ravages of this pest. As discussed under 
another heading, the occurrence of the pest during certain years is 
comparatively light, and the resulting injury is correspondingly 
reduced. 
ml Asn 
ce 
Uf 
Fig. 6.—Diagram illustrating the sequence of the usual 17 generations of the red spider in the course of 
one year. (Original.) 
GENERATIONS OF THE RED SPIDER. 
Regarding the number of generations at any given locality very 
little has been published. Ewing (1914) states that in Oregon the 
activities usually begin early in May and that hibernation com- 
mences in October. This furnishes an active season of about 180 
days, which, divided by 19.7 days (the duration of the life cycle 
based on his averages), gives nine generations occurring at Corvallis 
for the season. Worsham (1910) states that in Georgia there are 10 
