83 



administered in the form of a spray fl 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 maybe 

 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 beetles 

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

 time for this remedy is in the early morning, while the beetle's are 

 still somewhat sluggish. This method could only be employed with 

 benefit before the beetles have oviposited, and with the cooperation 

 of neighbors who possess similar trees, or in localities where tin- 

 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- off the ego- masses 

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

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

 easily seen b}^ looking for them from beneath the branches toward the 

 light. 



In connection with any 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 autumn. 



The protection of extensive woody tracts in which locust predomi- 

 nates is practically out of the question. 



THE LEAF-MINING LINDEN BEETLE. 



( Odontota rubra Web. ) 



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

 that he discovered the larva 4 in L827 and afterwards feeding noon a 



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

 are given on pages :> and 4 of Circular No. 8 of tliis Division, as also on pages 10 L2 

 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. 



