036 NEW JERSEY AGRICULTURAL COLLEGE 



in my possession was tried on various kinds of foliage when scale 

 breeding began, bnt much to my surprise the effect was so severe that 

 it was necessary to abandon it altogether. 



I am not ready to believe that this combination may not prove a 

 useful one, but it must be much less diluted and must )>e applied in 

 the late fall, before the scales are dormant. The maker suggests that 

 possibly the mixture had been exposed to freezing weather and had 

 l>ecome modified and the emulsion destroyed. It is a fact that this 

 was true of the larger lot, but not of the smaller sample. Neverthe- 

 less, the mixture deserves a further test, and, as already indicated, it 

 niav do better as a fall wash. 



Rose Niootine. 



A four-ounce sample of this was sent in by the manufacturers for 

 trial, with a statement of their belief that it was more active and 

 effective than any similar preparation. It was said to be, not a 

 tobacco extract such as is obtained by boiling and then evaporating 

 down, but a preparation of the nicotine poison itself. The directions 

 for use contemplated two to three tablespoonsful of the extract to 

 ten quarts of water. I used it at the rate of two ounces in eight 

 quarts, partly against apple-leaf hoppers and partly against larval 

 scales. In neither case was there any beneficial result. The appli- 

 cation was as thorough as one could be made, and if it were at all 

 useful some benefit should have been noticed; but even the half- 

 grown or larval hoppers, that were thoroughly drenched, minded it 

 not in the least. As for the larval scales, they were no more affected 

 than they would have been by so much water. This is in line with 

 previous results from applications of other tobacco preparations on 

 similar insects. » 



Dust Spraying. 



To speak of a "dust spray" is a contradiction. Nevertheless, the 

 term has made a place for itself and means simply tbe substitution 

 of some form of dry powder— usually lime— in place of water as a 

 carrier of insecticides or fungicides. In ordinary spraying an insecti- 

 cide, say Paris green, is mixed with or stirred into a definite amount 

 of water, and the mixture is then spread over a tree in the form of a 

 fine spray, through a nozzle, by the force of a pump. The water, as 



