MISCELLANEOUS CROPS. 



G51 



threads travel in the tissues of the young leaf, absorbing nourishment and 

 causing it t<> wither rapidly and die. Attacked plants early lose their bright 

 green colour, and a practised eye can quickly detect the change. 



Fig. 4. — A single fungus branch, highly magnified, showing the manner in which 

 the oval spores are attached. 



Methods of control must aim at preventing conditions favourable to the 

 development of the disease. They may be summarised as follows : — 



1. Prepare a number of seed-beds, suitably manured, so that the young 



plants may quickly become established. 



2. Sow these beds at intervals of two to three weeks. 



3. Do not over-water the young plants ; excessive moisture favours the 



disease. 



4. Allow the young plants plenty of air and sunlight. Plants grown 



under hessian are more liable to develop the disease than those 

 grown under straw. 



5. Transplant at the earliest opportunity. 



6. If the disease makes its appearance in any one of the beds, pull up 



and burn the infected plants immediately, and spray the remainder 

 with Bordeaux mixture (2-2-50). 



A Bacterial Disease of Tobacco. 



Seedlings that have been attacked by Blue Mould may die out completely, 

 or they may exhibit a partial recovery, sufficient to induce the grower to 

 transplant them. Such plants may grow in the field and completely recover, 

 or they may attain a certain size and then wilt. They seldom have the 



