558 NEW JERSEY AGRICULTITRAL COLLEGE 



iicid Avas applied ouee each Aveek for four weeks, begiauiug jiisl 

 after the plants were up. 



The mixture was made by slaking lime and leaving it quite thick, 

 nsing one and one-half quarts to one gallon of water and one tea- 

 :spoonf ul of crude carbolic acid. 



The Scalccide and kerosene emulsions proved injurious to the 

 ii'rowth of the onions. The lirst fly was seen May 13th. The tii*st 

 niagg(»ts were foimd IMay 24th in the check rows, where nothing 

 ■was us(>d. and also in the row ou which Sealecide was used. In 

 tlio orlur ])arls oi' the iield no maggots were fouud. 



Xn ilv was [(> be seen after the crude carbolic applications were 

 made, and tlu> odor (^f the acid was pcrccptibU^ si'veral days after 

 •eacli a]t])lii'.itiou. 



Mr. StcinliM- claims that as th-.' resiilr of his observations the 

 ■carlx'lic at'id omulsiini before the plants arc np and the lime and 

 carbolic acid mixture after they ;ire uj^ should be used to "extermi- 

 nare" the onion maggot. 



White lu'lleborc and tobacco dust are also good, but slunild be 

 jipidied very freely before rlu- onions are u]i. ami also every time it 

 rains afterward. 



As compared with the previous experiments, the tMu^ just re- 

 corded is remarkably successful, and it should be noted that, as 

 compared with the others, this latter one began before the plants 

 were actually u]\ and tlie ap}dications were continued at intervals 

 of a wei'k or less f-u" a mmith. 



Other Experiments. 



The applii'ations at Bakei-sville and at Windsor were inconclu- 

 sive because the maggots were so scarce that even untreated plots 

 remained h-oo from attack, aud no basis for comparison existed. 



Xo recommendations for actual practice are made at this time, 

 bur lii-owers are invited to study ^Mr. Stemlcr's results based on 

 oarlv and frequent applications of whatever nuiterial is us'ed. 



