CONTENTS. 



Page. 



Introduction 87 



Experiments in Virginia 88 



The codling moth 89 



The plum curculio 91 



Experiments in Michigan 92 



The codling moth 94 



Experiments in Delaware 98 



The codling moth J00 



The plum curculio 102 



Experiments in Kansas 102 



The codling moth 105 



Summary of results 107 



Conclusions 110 



ILLUSTRATIONS 



PLATKS. 



Page. 

 Plate IV. Fig. 1 — Picked apples from three trees of Plat I (demonstration) 

 in the Edward Hutchins orchard, Fennville, Mich. 

 Fig. 2. — Picked apples from three trees of Plat III 

 (one-spray) in the Edward Hutchins orchard, Fenn- 

 ville, Mich. Fig.3. — Picked apples from three trees of 

 Plat V (unsprayed) in the Edward Hutchins orchard, 

 Fennville, Mich 96 



TEXT FIGURES. 



Fig. 23. Diagram showing arrangement of plats and trees in the W. F. Gilkeson 



orchard, near Fishersville, Va 88 



24. Diagram showing arrangement of plats and trees in the Edward 



Hutchins orchard near Fennville, Mich 93 



25. Diagram showing arrangement of plats and trees in the F. C. Bancroft 



orchard, near Camden, Del 99 



26. Diagram showing arrangement of plats and trees in the Thomas fruit 



farm orchard, near Wichita, Kans 103 



in 



