636 



SPRA YING 



Host plant. 



Name of disease and fungus. 



Parts attacked. 



Tea 



Tobacco 



Tomato 

 Vine 



f Grey Blight (Pcstalozzia palniarnni). 

 j Brown Blight (Collctotrichnm 



caniclliac}. 



\ White-spot (Ccrcospora tlicac) 

 j Horse-hair Blight (Marasmiiis rota I is). 

 I Massaria t lie i col a. 

 { Brown Root-disease (Hynicnochactc 



noxia). 



Root-disease (Ustnlina zonata). 



Poria hypolatcritia. 



Diplodia sp. 



Pink-disease (Corticinin javauicnm). 

 L Roscllinia bothrina. 

 (Mildew (Oid in in sp). 

 j Wilt (F lisa rin m sp). 

 ( Mosaic-disease. 

 f Pimply Rot (PJiytoplitliora sp) 

 } Bacterial-wilt. 

 Mildew (Oidinm tnckcri). 



Leaf 



Stem and leaf 



Stem 



Root 



Branches 



Root 



Leaf 



Root 



Leaf 



Fruit 



Stem 



Leif 



SPRAYING 



The object of spraying is to distribute a poisonous fluid in a 

 finely divided form over plants, either for the purpose of ridding 

 them of injurious insects, or for checking the spread of fungus 

 disease. It is carried out by means of hand-pump sprayers, 

 knapsack sprayers, or with compressed air and spraying machines 

 of various designs. Where only a limited number of plants are 

 treated, a garden syringe will answer the purpose. In the case of 

 fungus diseases, it should be remembered that spraying is essentially 

 a preventive, which, to be successful, should be applied at the first 

 signs of the disease. Spraying operations are generally best carried 

 out when the foliage is in a moist condition. Emulsions containing 

 kerosene in any form should be used in cloudy weather only, or 

 after sunset. 



Dangers of spraying. As all insecticides and fungicides are 

 necessarily of a poisonous character, discretion must be used in 

 applying them over fruits or vegetables that will be consumed for 

 food. As the fruits ripen, the spray-fluid should be further diluted, 

 withholding it altogether when it is judged to be desirable to do 

 so. On quick-maturing vegetables or salads, as Lettuce, etc., which 

 are eaten in an uncooked state, it is obviously unsafe to apply any 

 poisonous sprays. Fruit trees should not be sprayed when in 

 blossom, as apart from any possible danger of the poison lodging 

 in the ovary it may seriously affect the setting of the fruit. 



