58 STATE POMOLOGICAL SOCIETY. 



RESULTS OF SPRAYING. 

 By S. C. Harlow. Bangor. 



I will endeavor in a plain, practical way to give you some thoughts 

 and observations connected with my experiments in ''Spraying" for 

 the destruction of some of the insect enemies of the orchard, of 

 which I shall confine myself to those attacking the foliage and fruit, 

 especially the larvae of the codling moth, carpocapsa pomenella in its 

 attack on apples and pears ; the curculio in its attack on plums and 

 cherries and often on apples in localities where the insect abounds 

 and where there is a scarcity of plums and cherries in which to deposit 

 its eggs. 



If to the list of the codling moth, curculio, caterpillar, canker 

 worm and currant worm (a most formidable list beginning with C), 

 to sa}^ nothing of leaf-rollers, "ei omne genus^" for whose destruc- 

 tion spraying with arsenite has proved to be the only successful 

 remedy, if to this list we could only add one more insect viz., the 

 apple maggot the larvae of irypeta pomonella that great destroyer of 

 the apple whose steadily increasing numbers if not checked may soon 

 make him a rival of the codling moth in his injury to the apple, could 

 we but include him also among this list for which spraying is a specific, 

 it would indeed be the occasion of the greatest rejoicing to the 

 orchardist and would mark a new era in the science of spraying. 

 Insecticides in the case of trypeta pomonella cannot help us, I am 

 very sorry to say, 'Hrypeta'' cannot be destroyed by spraying, viz.,. 

 the parent fly with its long ovipositor deposits the eggs from which 

 the young maggot hatches so far beneath the skin of the apple as to 

 entirel}^ protect it from the spray, in addition to which fact the late- 

 ness of the season at which the eggs are laid would make it unsafe 

 to use insecticide even if the young larvae were in reach of them. 

 If, as Professor Harvey urges all fruit raisers to do, they would des- 

 troy all infected fruit soon after it falls to the ground, before the 

 insect enters the earth, and also burn the refuse of apple bins and 

 barrels in which the fruit was stored, and so prevent escape of th« 

 pupae, it would largely diminish the increase of this pest especially 

 in orchards isolated, and if in addition a law was passed to prevent 

 importation of infected fruit as we do of intected cattle, it would be 

 a most efl^ectual method to prevent its increase. To one at al 



