EXPEKIMENT STATION REPORT. 555 



Xo. 10. Chech Bow, no application; forty-one plants were de- 

 stroyed. 



Expressed in tabular form, we have it as follows : 



Material. Plants Lost. Material. Plants Lost. 



Tobacco 22 Check and carbolic acid.... 33 



Hellebore 17 Kerosene and sand 29 



Carbolic acid emulsion 38 Kerosene emulsion 68 



ScalecJde 67 Check 47 



Exposure 39 Check 41 



Placed in this way, the only materials for which any obvidus ad- 

 vantage can be claimed are tobacco and hellebore. The keroseue^ 

 emulsion and Scalecide make a frightfully bad showing, while the 

 kerosene with sand stands third in the list of plants lost. 



On a general inspection throughout the territory around River- 

 ton, Mr. Diekerson found that the maggot had taken anywhere 

 from one-thiixl to one-half the plants on almost every plantati<:in> 

 Based on this general rate of infestation, only the hellebore and 

 tobacco showed any decided benefit. 



An obvious criticism is that the experimental applications were 

 uegun too late, and that none of the material had an opportunity of 

 acting on the very young maggots, where their effectiveness might 

 have been at the maximum. The carbolic acid emulsion was, as 

 already stated, too weak to be of any use except against the smallest 

 larvie. 



Hasted Experiments. 



Apnl 2Sdj Mr. Dickerson found on the Seabrook place onions in: 

 almost all stages of growi;h ; just germinating from seed sown ii 

 few days before ; sets that had sprouted three to four inches, and 

 ''scallions" ready for sale. The field of scallions had been sown 

 in September to be ready for March ; the young plants were almost 

 completely wiped out by maggots ; new seed was sown in October,, 

 and the scallions are therefore a month late, but free from maggots. 

 The adult onion fly was observed among these plants. 



May 26th, an examination of conditions showed that the tobacco- 

 and hellebore had been used on May 8th and 15th, and the kerosene 

 emulsion, Scalecide and carbolic acid emulsion on May 23d. Rows- 

 of onions growing for sets, and others growing from sets, were 

 found to 1)6 quite as badly infested where treated with the ma- 



