IO4 KNAPP METHOD OF GROWING COTTON 



of the larva or worm to the "webbing up" or 

 pupal stage is about fifteen days. Usually 

 the caterpillar spins a crude web or cocoon 

 using a portion of the leaf for the purpose, 

 but in many cases no web whatever is formed, 

 and the naked pupa hangs from the cotton 

 plant by means of a thread spun by the cater- 

 pillar. The time required from the "webbing 

 up" to the hatching out of the moth is in very 

 hot weather from seven to ten days. The 

 complete life cycle from eggs to moth will be 

 completed in hot weather in from three to 

 four weeks. A single moth lays from four to 

 six hundred eggs in a week or ten days and 

 then dies. 



From the fact that the worm feeds on the 

 foliage of the plant, it may be effectively 

 controlled by the use of poisons; Paris-green, 

 arsenate of lead, London purple, or any of the 

 arsenical poisons may be used for this purpose. 

 The most common method of poisoning is by 

 applying Paris-green mixed with one or two 

 parts of flour or lime. 



The most practical method of application is 

 the one commonly adopted, of sacks attached 

 to the ends of poles and carried on horseback 



