90 EXPERLMEXT STATION. [Jan. 



rather negative ones that this treatment had at least no in- 

 jurious effect on the i)lants, and that it did not give absolute 

 protection, as a few hills both in the treated and untreated rows 

 wore attacked bj wire worms, though too few to give evidence 

 of any value. 



The tests of this substance for protection against the onion 

 maggot were limited bv the small amount available. Two rows 

 of plants were treated, the Xicine being liberally applied around 

 the bases of the plants when they were about an inch and a half 

 high. At this time no maggots coidd be found anywhere in the 

 field. The Xicine was evident at the bases of the plants for 

 several weeks, but did not wholly protect the plants from mag- 

 gots, at least, as a few were attacked. Compared with rows 

 treated by other methods, it did not even afford a high degree 

 of protection, but as maggots were not particularly abundant 

 anywhere in the field, and the crop did not " catch " well, the 

 whole test can hardly be regarded as conclusive. 



^0^7 Fumicjant and Insecticide. — IManufacturcd by the 

 Shei'win-Williams Company, Cleveland, O. This material was 

 to have been tested in 1911, but the shipment was lost and not 

 recovered until too late in the season for use. It was applied 

 in the spring of 1912 to parts of the same corn plots described 

 under Xicine above, and in the same manner, though a little 

 more liberally. 



For the same reasons as in the case of Xicine the test can 

 hardly be regarded as proving anything. The corn in the 

 treated rows differed little in growth and product from that in 

 those untreated, and the wireworms proved not to be sufficiently 

 abundant to enable any determination of its value to be pos- 

 sible. Tests of this material in ^Maine and Minnesota during 

 1911 have been reported as giving no evidence of its value as 

 a protection from the attacks of insects. 



Zinc Arsenite. — Received from the SlierAvin-Williams Com- 

 pany, Cleveland, O. The com])any suggested using this at the 

 rate of 1 pound to 10 gallons of water, " in the abscMice of suffi- 

 cient data of a ]-)ractical nature and based only on its chemical 

 composition," and this suggestion was followed. 



The material was applied quite freely to elm, maple and wild 

 cherry leaves, July 8, no fruit trees being available for the 



