xii DISEASES OF CROP-PLANTS 



CHAFIER V : DISEASES DUE TO NEMATODES (EELWORMS). 



Heterodera radicicola, Greef. Tylenchus devastatrix, Kuhn. Page 

 Tylenchus tritici. Tylenchus angustus, Butler. Tylenchus 

 ribes, Taylor. Aphelenchus cocophila, Cobb. Tylenchus 

 similis, Cobb and T. musicola, Cobb _ _ _ _ ^g 



CHAPTER VI : THE RELATION OF INSECTS TO PLANT 

 DISEASES. 



Insects as the Cause of Injuries and Diseases. Stigmonoses. 

 Insect Injuries as Openings for Infection. Insects as Carriers 

 of Infection. Susceptibility and Resistance to Insect Infes- 

 tations _____-_--_ 66 



CHAPTER VII: NON-PARASITIC DISEASES - - . 69 



CHAPTER VIII : ENTOMOGENOUS FUNGI - - - 73 



SECTION II —PREVENTION AND CONTROL 



CHAPTER IX: GENERAL CONSIDERATIONS. 



Arable Crops and Parasitic Diseases. Sources of Infection. 

 Means of avoiding Damage. Resistance. Disease Evasion. 

 Elimination Methods. Spraying. Permanent Crops - - 81 



CHAPTER X : FUNGICIDES AND THEIR APPLICATION. 



The Copper Compounds. 



Bordeaux Mixture -------- 88 



Bordeaux Paste __-___-_ gi 



Burgundy Mixture -------- 91 



Copper Sulphate Wash --.__-_ 93 



Cuprammonium Washes ------- 93 



Sulphur Fungicides. 



Sulphur ---------- 94 



Lime-sulphur Solution --_-___ g^ 



Self-boiled Lime-sulphur ------- 96 



Liver of Sulphur ___---__ 97 



Ammonium Sulphide ------- 97 



Iron Sulphide ________ 97 



Potassium Permanganate --____ g7 



Spraying. 



Spray Injury --------- gS 



Dusting _-__-_-___ gS 



Disinfectants. 



Corrosive Sublimate -____ — - gg 



Formalin -__-____- 100 



