270 GARDEN FOES. 



liKMEDiEs. — As to remedies, it is obviously useless to 

 apply thein 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. 



Chrysanthemum Leaf Spot. — Occasionally the 

 leaves of the chrysanthemum 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 cuiTant, parsley, 

 and tomato. 



REMEDiEt^. — One thing is certain: It is wise, wherever 

 leaves are found with dark brown spots, to at once remove 

 and burn them ; afterwards spraying the foliage thoroughly 

 with Sulphide of Potassium solution (Formula No. 23) as 

 a preventive against a second attack. 



Chrysanthemum Mildew. — A form of mildew 

 peculiar to the chrysanthemum, 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 



