60 Agricultxiral ExPERiMEistT Station, Ithaoa, K. Y. 



tubes, had no effect upon the larvfe, haying failed apparently to pene- 

 trate through the silken covering." And judging from the closely 

 woven and comparatively thick covering over the larva, no insecticide 

 that would not injure the tree would penetrate the covering. Undi- 

 luted kerosene might, but we have found that it severely injures' the 

 previous year's growth on apple and peach trees. Thus there seems to 

 be no hope of reaching the insect while it is in hibernation. 



Thus far in the discussion of the preventive methods which can be 

 used against this pest, the conclusions reached have not been as encour- 

 aging as we had hoped to be able to present when the study of the 

 insect was begun. However, we have now reached that point in fol- 

 lowing the life history of the pest where we confidently believe it can 

 be easily and successfully combated. This point is where the little 

 half grown larva comes from its winter quarters and begins feeding in 

 the spring upon the opening buds. We have only to manage it so that 

 the little larva's first meal in the spring will be .a poisonous one. This 

 is the way the Codlin Moth is so successfully kept in check; the little 

 larva which hatches in the blossom end of the developing apple finds a 

 tiny bit of poison served up for its first meal by the deft hand of the 

 spraying machine. In a similar manner, if one can manage to have a 

 little poison on the opening buds when the larva of the Bud Moth 

 appears, the little creature can be eifectually destroyed before it can do 

 much harm. This can be easily and cheaply accomplished by spraying 

 the trees with an arsenite. 



When and with what shall we spray ? Fruit growers usually do not 

 begin to spray their trees until the blossoms have fallen. Recent 

 investigations, however, have shown that the best results are obtained 

 in fighting fungus diseases when the spraying is begun earlier. So 

 that fruit growers are now being advised to spray their trees once or 

 twice before the flowers open with a fungicide for the Apple Scab and 

 other kindred fungus diseases. Again, if fruit growers wait until the 

 blossoms have fallen — the time to spray for the Codlin Moth — before 

 spraying with an arsenite, the Bud Moth will have done the greater 

 part of its damage. Thus fruit growers must begin to spray earlier 

 than usual both for fungus diseases and for insect pests. And as the 

 insecticide can be combined with the fungicide and applied at the same 

 time, the extra expense of one or two sprayings before the blossoms 

 open will be more than met by the extra vigor and growth of the tree 

 and the increased numbers and selling qualities of the fruit. Experi- 

 ments have shown that it i)ay8 to spray for ^he fungus diseases alone 

 at this time, and we believe that this is the time when the Bud Moth 

 can be the most easily, cheaply, and successfully combated. 



