FREE BOOKS

Author's List




PREV.   NEXT  
|<   80   81   82   83   84   85   86   87   88   89   90   91   92   93   94   95   96   97   98   99   100   101   102   103   104  
105   106   107   108   109   110   >>  
ance of American boasting. But the opposition was overruled, and the triumphant result silenced all opposition. It is safe to say that the general opinion among Portuguese orange-growers to-day is very favourable to American enterprise and practical scientific acumen. The _Vedalia_ was earlier sent to the people in Alexandria and Cairo, Egypt, where a similar scale was damaging the fig trees and other valuable plants, and the result was again the same, the injurious insects were destroyed. This was achieved only after extensive correspondence and several failures. The active agent in Alexandria was Rear Admiral Blomfield, of the British Royal Navy, a man apparently of wide information, good judgment, and great energy. The same thing occurred when the California people sent this saviour of horticulture to South Africa, where the white scale had also made its appearance. It is not only beneficial insects, however, which are being imported, but diseases of injurious insects. In South Africa the colonists suffer severely from swarms of migratory grasshoppers, which fly from the north and destroy their crops. They have discovered out there a fungus disease, which under favorable conditions kills off the grasshoppers in enormous numbers. At the Bacteriological Institute in Grahamstown, Natal, they have cultivated this fungus in culture tubes, and have carried it successfully throughout the whole year; and they have used it practically by distributing these culture tubes wherever swarms of grasshoppers settle and lay their eggs. The disease, once started in an army of young grasshoppers, soon reduces them to harmless numbers. The United States Government last year secured culture tubes of this disease, and experiments carried on in Colorado and in Mississippi show that the vitality of the fungus had not been destroyed by its long ocean voyage, and many grasshoppers were killed by its spread. During the past winter other cultures were brought over from Cape Colony, and the fungus is being propagated in the Department of Agriculture for distribution during the coming summer in parts of the country where grasshoppers may prove to be destructively abundant. [Illustration: Grasshopper dying from Fungus Disease] Although we practically no longer have those tremendous swarms of migratory grasshoppers which used to come down like devastating armies in certain of our Western States and in a night devour everything green, sti
PREV.   NEXT  
|<   80   81   82   83   84   85   86   87   88   89   90   91   92   93   94   95   96   97   98   99   100   101   102   103   104  
105   106   107   108   109   110   >>  



Top keywords:

grasshoppers

 

fungus

 

disease

 

swarms

 
insects
 

culture

 

American

 

Alexandria

 

Africa

 

injurious


destroyed
 

States

 
people
 
result
 

practically

 

carried

 
migratory
 

opposition

 
numbers
 
Mississippi

Colorado

 

United

 

Government

 

secured

 
experiments
 
harmless
 

settle

 

distributing

 

successfully

 

cultivated


started

 
reduces
 

Although

 

longer

 

Disease

 
Fungus
 

abundant

 

destructively

 
Illustration
 

Grasshopper


tremendous

 

devour

 

Western

 
devastating
 

armies

 

During

 

winter

 

cultures

 

brought

 

spread