92 
CHRYSANTHEMUMS. 
and put a stop to the development of the leaf. The brown 
spots really indicate the fungus in its full stage of development; 
they are the fruit of the fungus. 
Remedies. — As to remedies, it is obviously useless to apply 
them when the leaves are covered with the brown spots, as the 
mischief has then been wrought. All that can be done then 
is to promptly pick off and burn every infected leaf. Directly 
afterwards spray the foliage with a solution of sulphide of 
potassium at the rate of an ounce to two-and-a-half gallons of 
tepid water. The liquid should be applied to the under and 
upper sides of the foliage, and allowed also to fall on the soil 
in the pots and on the ground, to make sure of destroying 
fallen spores. This may prevent the fungus spreading. To 
guard against an attack, the plants should be regularly sprayed 
every ten days throughout the season. If this plan be adopted, 
and all infected leaves, or very badly attacked plants, be 
promptly burnt, the much-dreaded Leaf Rust may be kept at 
bay. Great care should also be taken not to propagate from 
infected plants. 
Leaf-Spot. — Occasionally the leaves of the chrysan- 
themum are infected by dark brown spots, which seriously 
disfigure and weaken the growth of the plants This particular 
disease is caused by a fungus called Septoria chrysanthemi. 
But little is known of its life history at present. Other species 
of the genus, however, inflict similar injury upon the currant, 
parsley, and tomato. 
Remedies. — One thing is certain, it is wise, wherever leaves 
are found with dark brown spots on them, to at once remove 
and burn them, afterwards spraying the foliage thoroughly with 
the potassium solution advised in preceding paragraph, as a 
preventive against a second attack. 
Mildew. — A form of mildew peculiar to the chrysan- 
themum, and scientifically known as Oidium chrysanthemi, 
also does much damage to the foliage in some seasons. This 
mildew spreads over the leaves and also the petals of the 
blooms, sending its slender tubes into the cells, and speedily 
disorganising the functions of the plant. It is easily recognised 
by the greyish-white film of growth spread over the surface of 
