206 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 4 



washed were badly attacked, but our previous recommendation that 

 three whitewashings be given per year, one in March or April, a second 

 in Jul}' and a third in late September or early October, seems to hold 

 good on the average, and we feel confident that this program of treat- 

 ment, if carefully adhered to and the work is thoroughly done, will 

 control these pests, provided cultivation,' pruning and fertilizing are 

 intelligently combined with it. There is no doubt that the 12 per 

 cent emulsion of carbolineum avenarius is more effective in control- 

 ling the beetles, but we have not always had entirely satisfactory re- 

 sults upon the trees following its use. On the 2d of June Mr. Whit- 

 marsh found adults of Monarthru7n fasciatum appearing in great 

 numbers upon two peach trees near Danbury, Ohio, the trees having 

 been fairly riddled by them. He was not able to locate the species else- 

 where. We have not been able to find any previous record of this 

 species attacking peach. The Red Shouldered Sinoxylon, S. hasilare, 

 in peach wood was received from a correspondent. 



We tested the properties of iron oxide which had been used for 

 purifying gas and thrown out as a refuse product from the gas factory, 

 as a remedy for white grubs. Five or six acres of land was sub- 

 jected to test and several tons of oxide were used. It was applied 

 at the rate of 3,000 pounds per acre, 4,000 pounds per acre and 6,000 

 pounds per acre, or rather the fertilizer drill was set to sow fertilizer 

 at these rates. The oxide did not feed so fast as fertilizer and the 

 actual weights applied were about 66 per cent of these figures. On 

 one of the potato patches this was applied about one month before 

 planting time and the land was thoroughly disked and cross-disked 

 to evenly distribute the oxide through the soil. An extra harrowing 

 was given later to prevent weeds from starting. On most of the plots 

 no difference could be detected in the results, the checks appearing in 

 all respects like the treated plots. Growth was apparently interfered 

 with on the plots receiving the heaviest applications and the stand of 

 plants on these was noticeably thinner than over the rest of the field. 

 The material was applied to one field just before planting and the 

 stand in this field was perceptibly reduced. Living grubs could be 

 found in the treated blocks long after the treatment was given and so 

 far as w6 were able to ascertain they were scarcely interfered with at 

 all. If the grubs had been more abundant it is possible that results 

 would have been more apparent, but we hardly anticipate great 

 results from this treatment. Grubs have elicited many inquiries at 

 the Ohio station during the past three years. We made one test to 

 determine the comparative merits of arsenate of lead and of powdered 

 arsenate of iron when used for the Colorado potato beetle. Both 

 poisons were applied in combination with bordeaux. A double appli- 



