164 



Principles of Plant Culture. 



302. The Army-Worm may often be prevented from mi- 

 gration by plowing a deep furrow, as above directed, 

 and making the side toward the endangered crop verti- 

 cal, with a spade or shovel. The insects will congregate 

 in the furrow where they may be destroyed by dragging 

 a log over them. 



303. Grasshoppers and Locusts may be destroyed, be- 

 fore they have attained their wings, by drawing over the 

 infested ground, a " hopper-doser " which consists of a 

 shallow, sheet-iron pan, with a vertical, cloth-covered 

 back. The pan contains a little kerosene, and the cloth 

 back is kept saturated with the same liquid. The insects 

 jump into the pan or against the cloth back, thus becom- 

 ing wet with the kerosene, and soon perish. Grasshop- 

 pers may also be poisoned by distributing bran mixed 



into a mash with water containing ar- 

 senic in solution. Plowing grass land 

 containing the eggs of grasshoppers 

 tends to prevent an attack. 

 304. Apparatus for Ap- 

 B plying insecticides. Pow- 

 ders are readily applied 

 upon low-growing plants, 

 as the potato, cabbage 

 etc., by means of a sifting 

 A box consisting of a pail 

 with a perforated bottom, 

 a rigid handle and a tight- 

 fitting cover (Fig. 68). 

 FIG. 68. sifting box for applying For small plants, as young 

 powders. potato tops, the tin disc A 



which has a circular hole in the center, is laid inside on 

 the bottom of the box, and held in place by small lugs 



