Cultural methods. — These are: (1) Rotation of crops. (2) Destruc- 

 tion of cotton stalks, weeds, and grasses in the infested fields after 

 cotton picking is over in the fall, by pulling and burning where pos- 

 sible. (3) Deep fall or winter plowing, taking care to thoroughly 

 turn under all the vegetation. (4) Burning off or otherwise destroy- 

 ing the weeds, grasses, and rubbish on the terrace edges, ditches, and 

 borders of the field. (5) Keeping down all weeds and grasses in the 

 early spring. 



Remedial measures. — A careful outlook should be kept on the young 

 cotton in the early spring, and at the first indication of injury prompt 

 action should be taken. If, when first noticed, there are but few 

 infested plants, these may be pulled and burned, care being taken not 

 to distribute the mites to the surrounding cotton during the operation. 

 The cotton surrounding the infested place should then be thoroughly 

 sprayed with one of the mixtures described below, preferably one con- 

 taining sulphur. Spray the plants thoroughly, taking especial care to 

 cover the under sides of the leaves and the stems and branches. 



If a large area is infested when first noticed, or if it should be found 

 desirable to spray whole fields, a barrel or tank outfit should be used. 

 The pump should have no copper about it, a brass cylinder being pref- 

 erable. With one man to pump and two lines of hose, very rapid 

 work can be done. Sufficient hose should be used to allow free move- 

 ment around the plants being sprayed. It will be well to have an iron 

 pipe attached to the hose with the outer end bent upward and threaded 

 for the attachment of the nozzle. The pipe should be long enough for 

 this elbpw to reach the ground when the man doing the spraying is 

 standing upright.' Use a nozzle distributing a fine spray. By this 

 means the under sides of the leaves can be easily sprayed by simply 

 moving the pipe up and down through the plant. 



Among the many remedies that have been used against red spiders 

 on various occasions the sulphur mixtures stand foremost. Water, 

 Icerosene emulsion, and soap washes will also kill many of the mites and 

 some of the eggs. There will, however, be some eggs left to hatch, and 

 these sprays leave nothing on the leaf to kill the young freshly hatched 

 mites. No spray can be expected to reach all the mites or their eggs, 

 but the sulphur preparations, when properly prepared and applied, 

 adhere to the leaves, and there will be enough sulphur left on the leaf 

 to destroy most of the young mites that appear later. 



INSECTICIDE FORMULAE. 



Sulphur. — Ordinary powdered sulphur can be used dry, blown from 

 one of the powder guns manufactured for dry sprays. It may also be 

 used mixed with flour, road dust, or plaster of Paris. 



Lime-sulphur. — Into slaking lime dissolve an equal amount of pow- 

 dered sulphur. If only a small quantity is to be made, the heat gener- 



