SOME OF THE PESTS AND DISEASES 127 



leaves and the blooms so that in a little while the whole 

 plant is involved. Simple remedies immediately the 

 disease is apparent are a dusting with soot, or with a 

 mixture made up of four parts of sulphur to one of the 

 dust of quicklime. We prefer, however, to spray the 

 plants with a solution made up of three ounces of soft 

 soap and one ounce of sulphide of potassium (liver of 

 sulphur) in two and a half gallons of water, dissolving 

 these ingredients in warm water. The spraying should 

 take place immediately the mildew is first seen. We 

 would repeat the spraying at intervals of a fortnight 

 throughout the season, and would, at the conclusion of the 

 flowering, burn the haulm and stakes. Badly infested 

 plants should be pulled and burned. In this way the 

 perpetuation of this trouble may be avoided. 



SWEET PEA SPOT (Ascochyta pis'i}. This is another 

 disease that is a source of trouble at times. The disease 

 is generally noticeable on the pods, although it is some- 

 times apparent on the leaves and stems of the plants. 

 At first the irregular spots are of a pale green colour, 

 ultimately becoming almost white, with a dark bordering 

 line. The effect of this disease is seen in pods that 

 become drawn and irregular in form with their con- 

 tortions. 



Apply sulphide of potassium solution, as recommended 

 in the former paragraph, as soon as the spot disease is first 

 apparent, repeating the spraying at intervals of every 

 few days. It is a good plan when this trouble has once 

 been experienced to spray the Sweet Peas in their early 

 history in the succeeding season, in this way anticipat- 

 ing the reappearance of the disease, and by these means 

 exterminating it. 



SWEET PEA BLIGHT (Peronospora trifoliorum). This is 

 a source of considerable trouble in many gardens, just 

 as the plants give evidence of making vigorous growth. 

 Its presence is noted by dull, yellowish blotches on the 



