INSECT PESTS AND THEIR CONTROL 231 





maggots from reaching the roots. Clean up all cabbage stumps in the fall 

 and plow deeply. Rotate crops. 



The Colorado Potato Beetle (Leptinotarsa decemlineata, Say.). With- 

 out doubt the worst enemy 

 of the potato is the robust 

 yellow-striped beetle which, 

 together with its larvae or 

 slugs, feeds upon the leaves. 

 The insect is too well known 

 to need description. 



Treatment. Apply ar- 

 COLORADO POTATO BEETLE senicals either as a dust or 



(Leptinotarsa decemlineata}. 1 as a spray. Hand picking or 



ABeetle. B Larva. C Pupa. Enlarged. " bugging "may be resorted 



to in a small garden patch. 

 Bur. Ent. Or. 87, Bull. 82, Pt. 1. 



Flea Beetles. Small dark-colored insects which as adults feed upon 

 the foliage of many truck crops and weeds. The larvae feed upon the roots. 

 The name is derived from the active way in which the insect hops about. 

 In this respect it re- 

 sembles a flea. 



Treatment. C 1 e an 

 up weeds about the gar- 

 den that may form a 

 breeding place for the 

 pests. Apply arsenicals 

 to plants as a spray, 

 using Bordeaux mixture 

 preferably, which acts 

 as a repellent. 



Harlequin Cabbage 

 Bug (Murgantia histrim^- 

 ica, Hahn.). This gaud- 

 ily marked bug is easily 

 recognized by its bright 

 colors of red, yellow and 

 blue. It feeds upon cab- 

 bage, cauliflower, mus- 

 tard and other related 

 plants. 



Treatment. Plant a trap crop of mustard or turnips in the spring and 

 fall and when the bugs have become numerous spray with pure kerosene. 

 Hand picking may be profitable in the spring. Methods of clean culture 

 should be practiced, especially in the fall, tall cabbage stalks and weeds 



Jfiur. Ent. Cir. 87. * Bur. Ent. Bull 7 



y 



& 



HOP PLANT BORER (Hydroecia immanis). 2 



A Enlarged segment of larva. B Larva. C Pupa. 

 D Adult. Natural size. 



