FARMERS BULLETIN 856. 



Fig. 27. — The bean ladybird (EiiUachna corrupta) : 

 a, Larva ; 6, beetle ; c, pupa ; d, egg mass. About 

 three times natural size. 



BEAN FLY, OB SEED-CORN MAGGOT. 



The seed-corn maggot, also called the bean fly (fig. 57, p. 52), an 

 insect of about the size and appearance of the house fly, does great* 

 injury to early-planted beans, peas, and similar crops, and is fre- 

 quently the cause of the failure of such plants to develop. The maggot 

 scrapes or tunnels the seeds, sprouts, and stems of plants, both under! 



ground and in the 



stalks above, decay, 

 soon, sets in, and the| 

 plants die. Entire 

 plantings are fre 

 quently destroyed. 



Control. — Much 

 injury can be pre- 

 vented by using min- 

 eral fertilizers, since 

 soil containing much humus or mold or treated with barnyard ma- 

 nure is most subject to attack. Hand ])icking, although laborious, 

 is effective, and can be used in a small garden. The standard remedy 

 is carbolic-acid emulsion (see p. 8). 



BEAN LADYBIRD. 



The bean ladybird (fig. 27) is very injurious from Colorado south- 

 ward to Mexico. It is the worst enemy to the bean crop of that 

 region, and its work is compared to that of the Colorado 

 potato beetle. Both grubs and beetles devour all portions of 

 the plants — leaves, floAvers, and green pods. 



Control. — Use remedies advised for the Colorado potato 

 beetle (p. 56). A spray 



1 



strong enough to kill, the 

 beetles is apt to injure the 

 foliage. Do not plant beans 

 two years in succession in 

 the same region. 



BEAN LEAF-BEETLE. 



The bean leaf -beetle (fig. 

 28) does much injury in the 

 Eastern States and from 

 Ohio southward to Louisi- 

 ana. The beetles eat large round holes in growing leaves and feed 

 also on related wild plants, such as beggarweed or tickseed. The 

 grubs feed on the roots and main stem just below the surface, their 

 liabits being much the same as those of the better known cucumber 

 beetles. 



Fig. 28.- 

 cat a) : 

 grub. 



—The bean leaf-heetle (Crrotomn triftir- 

 a. Adult beetle ; b, pupa ; c, larva, or 

 Greatly enlarged. 



