336 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



In the fall it migrates to peach, and is also known as the green 

 peach-aphis, as which it is discussed on page 587 



The Turnip Louse * 



The turnip louse, also called the false cabbage aphis has recently 

 been recognized as a separate pest of crops of this group. It is 

 rather southern in its damage but extends over a large part of 



d 



FIG. 283. The spinach-aphis (Myzus persicce Sulz.): which often becomes 

 a cabbage pest: a, winged adult; b, young nymph; c, older nymph; d, 

 last stage of nymph all greatly enlarged. (After Chittenden, U. S. 

 Dept. Agr.) 



the country. Mr. Paddock's excellent summary of the insect 

 according to his observations in Texas, is given here verbatim: 



" A new species of plant louse, commonly called the turnip 

 louse, and not the cabbage louse, as was formerly supposed, does 

 the damage to the fall turnips and winter truck. This damage is 

 general over the entire State of Texas. Not only do the truck 



* Aphis pseudobrassicce Davis. See J. J. Davis, Bulletin 185, Purdue Univ. 

 Expt. Station; and F. B Paddock, Bulletin 180, Texas Agr. Expt. Station. 



