102 MANUAL OF^ VEGETABLE-GARDEN INSECTS 



threads. The full-^rown larva is about f ineli in length, dark, 

 dirty green with the head and the sides of the cervical shield 

 dark brown. The surface of the body is semi-transparent and 

 glossy in appearance. The caterpillars become mature in two 

 or three weeks and transform to mahogany brown pupae f 

 inch in length. The posterior end of the body is prolonged into 

 a bill-like process bearing four pairs of recurved hooks. The 

 pupal period occupies about eight days in warm weather. The 

 moth has an expanse of about an inch. The front wings vary 

 from, buff to pale yellowish gray, often tinged with purplish 

 and crossed by two irregular brownish lines and marked w^ith 

 two black dots near the front margin. The moth deposits her 

 eggs singly on the underside of the leaves. The eggs are 

 flattened, irregularly oval, yellowish or greenish in color and 

 aliout eV ii^ch in length. They hatch in about a week. There 

 are thought to be four generations a year. 



This beet web worm may be controlled by the measures sug- 

 gested for the Hawaiian beet web worm. 



Reference 

 U. S. Bur. Ent. Bull. 109, pp. 17-22. 1911. 



The Sugar-Beet Root-Louse 



Pemphigus hetce Doane 



In the western United States from western Kansas and 

 Nebraska to California, sugar-beets, beets and mangels often 

 have the roots infested with a small, pale yellow plant-louse. 

 In the case of sugar-beets, not only does the presence of the 

 plant-lice greatly decrease the weight but also the sugar- 

 content of the roots, in many localities making it unprofitable 

 to grow the crop. This root-louse is a native of the western 

 United States, where it is found most abundant on the roots of 



