EXPERIMENT STATION REPORT. 311 



huge worm {Pieris rapoi) ; the plum weevil, or plum cur- 

 culio ( Gonotrachelus nenuphar) ; the Colorado potato beetle 

 {Dophora dece7n-lineata) ; and the rose bug {Macrodactylus 

 subspinosa) . 



The various insecticides used were powdered hellebore, 

 pyrethrum powder, carbolate of lime, lime and kerosene, and 

 lime and sulphur. The above were used in the dry form 

 and in liquid. 



The Currant Worm. 



This worm is the larva of a moth about three-fourths of 

 an inch across, which destroys the foliage soon after it un- 

 folds, and again about the time the fruit begins to ripen. It 

 was destroyed very quickly by the hellebore and pyrethrum. 

 The latter, being more rapid in its action, and entirely 

 free from poisonous qualities, can be used without danger at 

 any time. The results of application of the other insecti- 

 cides were not satisfactory, and further experiment as to 

 their value must be made at some future time. 



The Cabbage Worm. 



The only eiFectual and easily applied remedy found for 

 this insect was the pyrethrum powder. This applied dry 

 destroyed the worms very quickly, even when mixed with 

 five times its bulk of common plaster. It was applied by 

 means of a pair of common sulphur bellows with a curved 

 nose, a single movement of the bellows being sufficient to 

 send the dust over all parts of the inside of the plant. In- 

 secticides applied in liquids did not prove satisfactory, on 

 account of the peculiar structure of the surface of the leaves 

 of the cabbage, which causes the liquid to roll off in drops. 

 This remedy proved most effectual when extended with an 

 equal bulk of plaster. 



CurcuUo, or Plum Weevil. 



All the remedies applied for the destruction of this 

 pest were ineffectual in saving a single specimen of fruit 

 from some twenty trees that bloomed and set a large 

 crop. 



