83 



administered in the form of :i si;ray " in the .same manner as for the 

 imported elm leaf -beetle. 



The leaves of locusts are so smooth that they are apt to shed an 

 ordinary spray of Paris green, but this can be obviated by the addi- 

 tion of glucose or molasses to the spraying mixture, or by the more 

 adhesive arsenate of lead. It should be unnecessary to state that the 

 proper time to spray is upon the first appearance of the beetles in May 

 or June, according to the localities infested, that the beetles may be 

 destroyed before egg-laying commences. 



Small groves can be pi'otected by jarring the beetles from the trees 

 into sheets prepared for the purpose and saturated with kerosene in 

 the same manner as in use against the plum curculio and other beetles 

 which drop to the ground and feign death when disturlied. The best 

 time for this remed}^ is in the early morning, while the beetles are 

 still somewhat sluggish. This method could oidy be employed with 

 benefit before the beetles have oviposited, and with the cooperation 

 of neighbors who possess similar trees, or in localities where the 

 locust trees are isolated, not surrounded ])y others growing wild. 

 This manner of collecting the beetles, to be effective, would have to be 

 practiced every fewda3^s so long as the beetles continue to be attracted 

 to the trees. 



Where only a few trees in yards or lawns are to l)e protected, even 

 more simple mechanical methods could be employed, such as jarring 

 the beetles into inverted umbrellas and picking off the e^^ masses 

 l)efore these hatch. The egg masses are not difficult of detection and 

 are sufficiently conspicuous by reason of their size and color to be 

 easily seen by looking for them from beneath the branches toward the 

 light. 



In connection with an}^ remedy that might be employed, clean culture 

 must always be practiced, which includes the destruction of all volun- 

 teer locust growth in the inunediate vicinity of trees planted for shade 

 and ornament, and the prompt raking up and destruction of the locust 

 leaves and other debris about the trees in the early autumn. 



The protection of extensive woody tracts in which locust predomi- 

 nates is practicall}" out of the question. 



THE LEAF-MINING LINDEN BEETLE. 



( Odontota rubra Web. ) 



This is also one of the species observed b}" Harris. He states 

 that he discovered the larvae in 1827 and afterwards feeding upon the 



« Instructions for the application of the arsenical poisons against the elm leaf-beetle 

 are given on pages 3 and 4 of Circular No. 8 of this Division, as also on pages 10-12 

 of Farmers' Bulletin No. 99; and since both of these publications can readily be 

 nbtained by application t ) this Department, no further instructions need be given 

 hjrc. 



