83 



administered in tiie form of a .spra}" " in the same manner as for tlie 

 imported elm leaf-beetle. 



The leaves of locusts are so smooth that the}^ 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 iirst 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 protected 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 })cetles 

 vs^hich drop to the ground and feign death when disturbed. The Ijest 

 time for this remedy 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 by others growing wild. 

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

 practiced every few days so long as the beetles continue to be attracted 

 to the trees. 



Where only a few trees in yards or lawns are to be protected, even 

 more simple mechanical methods could be employed, such as jarring 

 the beetles into inverted umbrellas and picking oft' the eg^ masses 

 before these hatch. The egg masses are not difficult of detection and 

 are sufficienth' conspicuous by reason of their size and color to be 

 easil}' seen by looking for them from beneath the branches toward the 

 light. 



In connection with anv remedy that might be employed, clean culture 

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

 teer locust growth in the immediate 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 autuum. 



The protection of extensive woody tracts in which locust predomi- 

 nates is practically out of the question. 



THE LEAF-MININ(} LINDEN BEETLE. 



( Odontota rubra Web. ) 



This is also one of the species observed by Harris. He states 

 that he discovered the larva? in 1827 and afterwards feeding upon a 



« Instructions for the application of the arsenical poisons against the latter species 

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

 of Farmers' Bulletin No. 99, and as both of these publications can readily be 

 obtained by application to this Department, no further instructions need be given 

 here. 



