INSECTS AND DISEASES 49 
chief remedy for rust, as well as other diseases 
of ornamental plants. This is a mixture of 
copper sulphate and lime in the proportions of 
four pounds of the former, six pounds of the 
latter, and fifty gallons of water. The lime should 
be slaked and: the copper sulphate crystals dis- 
solved in separate wooden or earthenware vessels; 
then the two solutions are diluted with part of 
the water, poured together into a third vessel, 
and the rest of the water added. 
Blight is a disease of a peculiar nature. A 
plant may seem healthy when, apparently without 
cause, one shoot, or perhaps several, will wilt, 
wither, and die. Or it may affect the leaves 
in the same manner. The remedy is as before — 
Bordeaux mixture; or, if the season is so advanced 
that the fruits are maturing, ammoniacal copper 
carbonate may be used with the same results, 
but without any injury to the appearance of the 
foliage. This is made by diluting three pints of 
ammonia with seven or eight parts of water, 
making a paste of five ounces of copper carbon- 
ate and a little water, and adding it to the am- 
monia; then add water to make fifty gallons and 
use as promptly as possible. 
Mildew is also a fungous disease, although it 
may not appear similiar to the others. In this 
