New York Agricultural Experiment Station. 517 



tecting the foliage against the attacivs of the adult beetles. The 

 most practical method of accomplishing the latter is to spray 

 thoroughly with Bordeaux mixture as recommended for potato 

 blight.* 



Fig. 1, Plate XXXV, represents the ;idul( Ilea beetle; Fig. 4 

 represents the grub, and Fig. 5 shows its position while feeding. 

 It is to be regretted that all of tlie specimens of pupae preserved 

 for study were accidentally destroyed, so that it is impossible to 

 present a figure of the pupa at this time. 



The Value op Bordeaux Mixture as a Preventive of Flea- 

 Beetle Injuries. 



Flea-beetles do a great amount of damage to the foliage of 

 various cultivated plants by gnawing numerous small, round 

 holes in the leaves. They are especially destructive to seedling 

 plants. In potato fields they are sometimes so numerous as to 

 greatly retard growth by keeping the young potato plants eaten 

 otf as fast as they show above ground. Tomato and egg-plant 

 seedlings are frequently ruined by them. 



The ordinary insecticides, such as London purple and Paris 

 green, used so effectively against leaf-eating insects in general, 

 seems to have but little effect on fiea-beetles. Fairly good re- 

 sults have been obtained by frequently dusting the foliage, when 

 the dew is on, with repellants such as tobacco dust and air- 

 slacked lime. Recently it has been found that Bordeaux mixture 

 is a very successful preventive of flea-bee t,le attacks. This 

 remedy was brought into prominence by the potato spraying 

 experiments of Prof. Jones at the Vermont Experiment Station 

 in 1893 and 1894. It was there shown-}- that a single application 

 of Bordeaux mixture reduced the amount of injury done by flea- 

 beetles from twenty-five per cent, to as much as fifty-four per 

 cent., according to the strength of the Bordeaux mixture, the 

 stronger solutions being the more effective. Prof. LodemanJ 

 found the benefit less marked. In his exj)eriments the amount 



♦ See New York Exp. Sta., Bulletin No. 101. p 77; and p. 499 of this Report. 

 + Sae Seventh Ann. Rept. Vermont Exp. Sta., p. 50: and Eighth Ann. Rept. Vermont Exp. 

 Sta D 95 

 t Lodenian, E. G., Cornell Univ. Exp. Sta., Bull. No. 113, p. 276. 



