^220 



MONTANA EXPERIMENT STATION 



The Surphus fly larvae are probably of greater usefulness than the 

 larvae of the lady-bug since they are usually more abundant, but like 

 the beetle larvae, they do not appear on the scene until the lice have 

 become abundant and are multiplying with such rapidity that it 

 :would require a large number of destroyers to dispose of the increase 

 alone. Figure 8 illustrates a common species of lady-bug of the 

 East, while at Figure 2, plate i, is shown an adult of the species here 

 discussed. Figures 3 and 4 of the same plate show the eggs of the 

 same species and at Figure 5 is shown a full grown larva. 



Figure 8, The Two Spotted Lady Bug; a. larva; b, mouth parts of same; c, claw of same; 

 d, pupa; e, adult; f, antenna — all enlarged. (Marlott Circular 7, Sec. Series, Division of Ento- 

 mology U, S. Dept. Agr.) 



REMEDIES FOR APPLE LEAF-APHIS. 



In spraying for this aphis we would emphasize the importance of 

 .watching for the individual infested trees here and there in the orch- 

 ard and treating them before the lice spread to the other trees. In 

 other words, the spraying for the apple leaf-aphis should be done and 

 out of the way early in the season, for under ordinary circumstances, 

 when vigorously fought early in the summer, though some lice es- 

 cape, there will be so few left that the natural enemies will be able 

 to keep them from overrunning the orchard. 



The value of prompt treatment is apparent when : we 

 fealize the enormous power of multiplication with which 

 nature has endowed these insects. In a previous para- 



