240 



INSECT PESTS OF FARM, GARDEN AND ORCHARD 



has been most generally used, but recently powdered arsenate of 

 lead has been found superior to it. Arsenate of lead is used at the 

 rate of 2 to 5 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 

 applications should be sufficient, the first when the eggs commence 



FIG. 203. Pupa of the bollworm in its burrow in the soil, showing burrow 

 made by the larva and filled in, and the exit burrow for the moth also 

 made by the Jarva natural size. (After Quaintance and Brues, U. S. 

 Dept. Agr.) 



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. 



