Pests and Diseases 



checked, and it should be freshly mixed for each 

 time. 



Lime-sulphur washes are also used to check mil- 

 dew on plants. A self-boiled lime-sulphur wash 

 is made in the following manner. Three pounds 

 of freshly burnt quicklime is placed in a wooden 

 tub and about \ gallon of water is poured over 

 it ; 2 Ibs. of flowers of sulphur is then added and 

 next about \ gallon of boiling water. The mixture 

 boils, bubbles and splashes for some time, and the 

 tub should be covered with a piece of sacking, but 

 the covering must be removed occasionally to allow 

 the mixture to be stirred. At the end of about fifteen 

 minutes the boiling will cease and then the wash is 

 made up to 10 gallons with extra water. 



Before using, the lime-sulphur wash should be 

 strained through coarse sacking or a fine-meshed 

 sieve to remove the grit, etc., but the sulphur and 

 fine lime should all pass through. 



Bordeaux and Burgundy mixtures at half strength 

 (see Board of Agriculture leaflet No. 131) are also 

 used for some of these external diseases, notably for 

 apple and pear scab, but there is a risk of scorching 

 the foliage and care should be taken to follow the 

 directions which are given in the leaflet. 



American Gooseberry Mildew (Leaflet No. 195) 

 is not easily stamped out but it may be noted that 

 some varieties of gooseberries are more resistant 

 to attack than others. 



INCURABLE DISEASES. 



There are one or two fungus pests for which no 

 effective remedies have been found. Fruit trees 

 suffering from a severe attack of the canker fungus 



72 



