70 



The following suggestions for another season are made: 



After the leaves are cut the stalks should be destroyed as promptl}^ 

 as possible, and the entire fields should be cleaned of refuse; and this 

 applies also to barns and other places where the tobacco is stored. If 

 this be done sj-stematieally over the entire affected area it will leave 

 very few insects to combat the following year. 



The first appearing insects could l)e attracted and successfully dealt 

 with, there is no doubt, by setting early plants as traps here and there 

 over the area to ])e grown in tobacco. Their growth could be stim- 

 ulated, and they could bo Y)rotected from insects and the weather until 

 ready for use, by covering them with square frames covered with 

 cheese cloth or similar material. A few days before planting the 

 main crop the covers should be removed and the plants thoroughly 

 coated with a spray of some arsenical. 



Before setting out the main crop the plants should be dipped in a 

 solution of arsenate of lead, prepared at the rate of 1 pound of poison 

 to 100 gallons of water. This would not scorch the plants, and it 

 would be preferable to Pai'is green, as it remains longer, requiring 

 more rain to wash it off'. In a week or ten days, according to the 

 growth of the })lant, a second spraying should be made, and for this 

 purpose either arsenate of lead or Paris green and P)ordeaux mixture 

 can be used. 



It is suggested by way of experiment that one plat of, say, 25 or more 

 plants be sprayed with arsenate of lead; a second with Paris green, 1 

 pound to 150 gallons of water; a third with Paris green at the same 

 rate, with the addition of Bordeaux mixture used instead of lime as a 

 diluent; and the fourth, with Bordeaux mixture alone. It is not 

 known to what extent Bordeaux mixture woidd prove repellent to this 

 weevil (possibl}' not greatly), but if sufficiently distasteful it would 

 drive the insects from the plants treated with it to others which should 

 be poisoned with Paris green alone. 



THE LEAF-MINING LOCUST BEETLE, WITH NOTES ON RELATED 



SPECIES. 



By F. H. Chittenden. 



The foliage of the common, yellow or black locust tree {Roblnia 

 j)seudacacia) is subject to the attack of a leaf -beetle, sometimes Called 

 in literature the locust \l\ii^ix{Odontota ^7o/vs'«/?'6'Thunb.) and which we 

 may call the leaf -mining locust beetle to dTstinguish it from several 

 other forms of insects, mostly the larva? of Tineidte, which also mine 

 the leaves of this tree, and from other beetles which attack the trunk 

 and other portions of the tree. Injury by the species under discussion 

 is due mainl}' to the work of the larva?, although the })eetles also assist. 



