INSECTS INJURIOUS TO CABBAGE AND OTHER CROPS I47 



for flea-beetles. It adds to the effectiveness of Paris green, 

 however, to use Bordeaux mixture as a diluent, as the latter 

 in addition to being a fungicide is a powerful deterrent of 



Fig- 98.— Water-cress leaf-beetle (Phxdon seruginosd). a. Adult; b, larva; d. pupa 

 Enlarg:d six times. (Author's illustration, U- S- Dept. Agr.) 



flea-beetles. See page 65 on remedies for leaf-beetles and 

 flea-beetles. 



The Water-cress Leaf-beetle (Phcedon cvniginosa Suffr.) 

 has been reported injurious to water-cress since 1903. It is a 

 small, metallic blackish beetle (fig. 98) and with the water-cress 

 sowbug (figured on page 4) is a pest on 

 the plant from which they have both re 

 ceived their English name.^ 



The Western Cabbage Flea-beetle (Phyl- 

 lotrcta pusilla Horn.). — In some of the 

 western States not yet inhabited by either 

 of the preceding there is a smaller, dark- 

 colored flea-beetle which sometimes does 

 great damage to crucifers and many other 

 crops. 



This flea-beetle is of a uniform deep pjg 99.— western cab- 

 polished olive-green color, and the surface bage fiea-beetie. Much 



, , T- , enlarged. (After Riley, 



IS irregularly punctate. It measures about u. s. Dept. Agr.) 

 seven-hundredths of an inch in length. It . 

 ranges from the Dakotas to Mexico, and westward to Southern 

 California and is often found in great numbers. 



1 Information concerning both species is furnished in Bui. No. 66, Pt. II, 

 Bu. Entom., U. S. Dept. Agr. 



