10 FARMERS’ BULLETIN 1735. 
are likely to be overlooked during the first inspection. Great care 
should be taken to locate every plant which shows infestation, and 
these must be taken from the field, without brushing against healthy 
plants, and burned immediately. If infestation has not advanced 
too far, the prompt application of this method is usually effective. 
If infestation has spread until a considerable patch has become 
involved, more drastic steps are necessary than those just men- 
tioned. Where a continuous area of infestation occurs in a large 
field, it is often advisable to plow up the worst affected portion 
and spray the rest of the infestation in order to save the balance of 
the field. The stalks should be quickly piled up and burned with 
the aid of straw or light trash. Such a severe measure should only 
Fic. 8.—Bucket spray pump. (From Quaintance illustration.) 
be resorted to in extreme cases, and the planter concerned must be 
the judge of its advisability. 
INSECTICIDES. 
Out of 75 different spray combinations tested against the red 
spider on cotton the following have been found to be thoroughly 
satisfactory: (1) Potassium sulphid (1 ounce to 2 gallons water) ; 
(2) lime-sulphur (homemade or commercial); (3) kerosene emul- 
sion (prepared according to usual formula); (4) flour-paste solu- 
tion (1 gallon stock paste to 12 gallons water). Spraying for the 
red spider is effective if it is done with extreme care. The fore- 
going sprays, when properly applied, kill all mites, but @ second 
spraying, one week later, is necessary to kill the individuals that 
were in the egg stage at the time of the first spraying. Arsenical 
sprays are of no use against red spiders. 
