THE LARGER CANNA LEAF-ROLLER. 



METHODS OF CONTROL. 



The rolled-over inargiiis of the leaves of caiiiia caused by this 

 caterpillar can after a time be very readily detected while the larva' 

 are still young. (See fig. 2.) Later large holes will apjiear and the 

 rolled-iip leaves will be more prominent unless something is done 

 to check the pest. The dark excrement will be found below the 

 infested leaves and will also serve to indicate the presence of the 

 lar\a, and after opening any of these rolled-over leaves the insect 

 will usually be found therein, or traces of its former presence. All 

 of these facts, together with the large size of the insect itself, permit 

 it^ control by hand methods. Hand-picking was successfully prac- 



Fio. 8.- — Bed of cannas showini: serious injury by lai-frcr canna loaf-roller. Many leaves 

 wilted and dvins, or notched, as shown in foreirround. W.nsliinston, D. C. (Oriirin.-il. i 



ticed al Lafayette ,S(]iiare. A\'ashington. D. C. in late July, I'.'ll. 

 and on the Department of Agi'iculture grounds, by squeezing the 

 leaves with gloved hands. Tn the former locality the insects were 

 very abundant ; in the latter they were so well controlled by hand 

 methods as scarcely to be noticed on the many canna plants which 

 were grown. 



The usual ar.senicals, such as Paris green and arsenate of lead, 

 with or without Bordeaux mixture, can be used without any real 

 danger of poisoning. Their use is not always desirai)le, because of 

 the presence of children, who are allowed to roam into yards which 



