TAI5LE OF CONTENTS TO REPORT IV. 27 



Page. 

 The Lesser Apple Leaf-folder 47 



Its larva and pupa closely resembles those of the foregoing species, 47 



Mr. Wier's account of its habits, 48 Remedy, 49. 

 The Apple-leaf Bucculatrix 49 



It is not very injurious in Missouri, 49 Account of damage caused by it 

 in New York, 50 The worm and its habits, 50 Its transformations, 

 50 Season of the appearance of the moth, 50 Remedies, 50 Hab- 

 its of Bucculatrix thuieUa, 51 Description of larva and pupa of the 

 Apple-leaf Bucculatrix, 51. 

 The Apple-twig Borer 51 



Its frequent occurrence in Missouri, 51 Characters of the beetle, 52 

 The holes made by it in the twigs, 52 The holes are made only for 

 food and protection, 52 The insect breeds probably in the sap-wood of 

 forest trees, 52 The larva of Shwxylon bassillare mistaken for that of 

 the Apple-twig Borer, 52 Remedy, 53. 



Insects injurious to the Grape-vine 53 



THE RED-SHOULDERED SINOXYLON 53 



Characteristics of the insect as imago, larva and pupa, 54 Damage done 

 by it to grape-vines, fruit trees and Hickory, 54 Description of the 

 larva and pupa, 54. 



Grape Disease 55 



THE GRAPE-LEAF GALL-LOUSE 55 



Its scientific name, 55 The law of priority, 55 European grape- vines 

 valueless in the eastern U. S., 55 Deterioration of some of our native 

 vines, 56 Climatic reasons for the failure of European vines, 56 

 The principal cause of this failure is the Phylloxera, 56 Further 

 proof of the identity of the American with the European insect, 57- 

 Reasous for the identity of the Gall-louse with the Root-louse, 57- 

 Further facts respecting the habits of the Root-louse, 58 Underground 

 forms, 58 The young lice and their habits,59 Hibernation, 59 

 The pupa, 59 The winged female, 59 Susceptibility of different 

 vines to the attacks of the louse, 60 Classification of the North Amer- 

 ican grape-vines according to their practical importance, 60 Synop- 

 sis of the True Grape-vines of the U. S., by Dr. George Engelmaun, 



60 Difficulty of separating the cultivated varieties of grape-vine, 



61 Importance of a proper classification of cultivated grape-vines, 

 62 Importation into Europe of resisting American vines, 62 Enum- 

 eration of the cultivated varieties and their susceptibility to the dis- 

 ease, 63 No variety is entirely exempt from the attacks of the root- 

 louse, 64 American vines which resisted the root-louse in Europe, 



64 Means of contagion from one vine to another, 64 The spread of 

 the root-lice from one vine to another, 64 Transportation of the louse 

 upon the roots of seedlings and cuttings, 64 Spread of the disease in 

 France, 64 The winged female of the root-louse and her function, 



65 The vernal leaf-gall, 65 Preference of the winged Phylloxera for 

 the Clinton grape and its allies, 65 Power of flight of Phylloxera ca- . 

 rynfolia 1 , 66 Deposition of the eggs upon the leaf, 66 Probable rea- 

 sons why the injuries of the Phylloxera are greater in Europe than in 

 America, 66 Outward and more visible effects of the root-disease, 

 67 Practical suggestions, 67 No need to destroy the Clinton vines, 



67 Influence of soil on the intensity of the disease, 67 Remedies, 



68 Destruction of the gall-lice, 68 Destruction of the root-lice, 68 

 Results of experiments in France with various substances, 68 Irriga- 

 tion and submersion, 69 Re'sunie' of the insect's history, 69 No need 

 of unnecessary alarm, 70. 



