644 NEW JERSEY STATE AGRICULTURAL 



as thoTOiigli as 1 cxniUl make il. and when dried, the trees had a 

 bluish white appearance. In order io make the test as fair as 

 possible, a \arict\- iiT trees was selected, all ol' them infested by 

 the pernicious scale and some of them hadly infested. 

 The trees were as follows: 



Plum — Mariana, 1. 



Prune — German, 1. 



Peacli — Champion, 1; Greonsborough, 1; Trellised European, 1; Elberta, 

 1; Mountain Rose, 1. 



Apple — Yellow Transparent, 1: Grimes Golden, 2; Gravenstein, 1; Bald- 

 win. 1. 



Pear — Japan Golden Russet, 1. 



Details k^\ the applications, all of which were in the Experi- 

 ment Orcharil. and were uKule hv me or under my personal 

 supervision, are in the Records of the Orchard, printed else- 

 where in this report. 



Briefly stated here, the results were totally un=;at is factory. 

 In not a single instance was a tree so far cleaned as to preserve 

 it for the season, and in e\ery instance where the tree was at all 

 badly infested, the first brood developed in such nnmhers that 

 immediate treatment was demanded. 



It is perhaps too much to say that the mixture did not kill any 

 of the scales; but it certainly did not kill more than a very small 

 pi^rcentag^e. Based on my own ex[>erience. better results can be 

 obtained with materials costing onlv one- fourth as much ; hence, 

 anv use of the l^niversal Insecticide and Scale Killer as against 

 the pernicious scale, is a mere waste o\ monew 



PETROLEUM PREPARATIONS. 



Petroleums, crude or in the retined forms, have maintained 

 themselves as scale killers during the past season, though there 

 was less oil used than during the years last preceding because 

 of the general rush to the lime-sulphur comi>i>unds as safer and 

 equally effective. 



There is, unfortunately, no doubt that the mineral oils are 

 dangerous to plant life and that all the factors that constitute 

 this danger are not yet understood. Some few growers have 

 learned to used them with confidence, to the benefit of the trees 

 and the discomfiture oi the scale: Inn they are in liie minority, 

 and most men in using the undiluted o\\. stand at least an even 

 chance of causing injm-y. To i obviate this trouble and to reduce 

 the t^ils. enuilsions with stxi]) and mcchanic;d niix!m"es. ha\e 



