EXPERIMENT STATION BULLETINS. 157 



The beetle of buggy beans, belongs, of course, with the insects affect- 

 ing dried seeds and grains in a bulletin to come later, but as it also 

 works in green beans, a short account is included here. 



This pest which destroys such quantities of seed beans is only about 

 one-eighth of an inch in length. It is brownish-grey in color with a 

 greenish tinge. It carries its head bent at right angles to the body, 

 and the wing-covers are somewhat shorter than the abdomen, lending 

 to the beetle the appearance of wearing an outgrown coat. There are 

 several generations each year, the eggs of the first generation being 

 laid either on the outside of the pod or in slits cut with the jaws. The 

 larvae immediately enter the pod and afterward the beans, sometimes 

 several working in the same seed. When the beans are harvested and 

 threshed, the beetles continue to work in the dried beans, and some- 

 times in dried peas, rearing several generations in the course of a year. 



When the beetles are numerous their work results in the more or less 

 complete destruction of the beans. Infested beans are not suitable for 

 seed, as the beetles that come from them attack the green beans, further- 

 more such beans produce inferior plants when they do grow. 



REMEDIES. 



Fumigation of the seed with carbon bisulphide is the only reliable and 

 efficient measure for this pest. 



INSECTS AFFECTING THE BEET. 



INSECTS WORKING ON THE ROOTS. 



' The Clover-root Mealy-bug (DactyJopius trifolii) . 



On one occasion, the writer found numbers of mealy-bugs w^orking on 

 the roots of small sugar-beets. Their presence was indicated by the 

 unhealthy, yellow appearance of the beets affected, some of which died, 

 but the trouble was of short duration and did not affect more than a 

 single field. The field in question was preceded by clover which had 

 been infested. For a description of this insect and its work see Bulletin 

 200 of this station. 



White-grubs (see Insects Affecting Sweet-corn). 

 Wire-worms (see Insects Affecting Sweet-corn). 



INSECTS WORKING ON THE FOLIAGE. 

 Plant-bugs {Lygus pratensis) et al. 



A long list of plant-bugs have been seen to work on the beet, notably 

 on the sugar-beet, but our worst enemy of this type is the common tar- 

 nished plant-bug. This bug is flattened in form, and a little less than 

 one-fourth of an inch long, metallic brown, variably marked with yellow 

 and black. The whole resulting in a surface resembling tarnished brass, 

 hence the name. The young are greenish in color wath five black dots 

 on the back. There are several generations each year, the insect work- 



