256 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



As the eggs are laid mostly on the cotton leaves and the little 

 caterpillars nibble the surface before boring into the bolls, the 

 poisoning of the foliage when the eggs are hatching will result in 



a very material reduction of the 

 subsequent injury. Paris green has 

 been most generally used, but 

 probably powdered arsenatc of lead 

 will be found superior to it. Paris 

 green has been used at the rate 

 of 3 pounds per acre, applied either 

 pure or diluted with lime or flour, 

 using either a bag and pole, hand powder-gun or geared 

 dusting machine. The dusting should be done while the plants 

 are wet with dew. When not followed immediately by rain, two 



FIG. 184. Egg of bollworm ; side 

 and top views. Highly mag- 

 nified. (From Quaintance and 

 Brues, U. S. Dept. Agr.) 



FIG. 185. Bollworms showing variation in color, upper larva green, middle 

 rose, and lower, dark brown twice natural size. (After Quaintance and 

 Brues, U. S. Dept. Agr.) 



applications should be sufficient, the first when the eggs commence 

 to hatch in numbers, usually between July 25th and August 5th, 

 and the second about a week later. If rains follow, the applica- 

 tions should be at once repeated. 



