92 THE BOOK OF THE GRAPE 



shortly before dark, but not before the sun has gone off 

 the vinery. The house, being dry and closed at the time, 

 will quickly become filled with the sulphury fumes. 

 The fire should be kept going hard for a couple of 

 hours, so as to run the temperature up to eighty-two 

 degrees, but not higher. The fire should, at the ex- 

 piration of two hours (with the temperature at the point 

 indicated), be slackened and a little air put on. Heating 

 the pipes and closing the vinery in the manner described 

 for two or three evenings in succession, and ventilating 

 rather freely on the following days, weather permitting, 

 will exterminate the mildew. 



Mealy-bug (Dactylopius adonidum). Once this very 

 undesirable and objectionable-looking creature effects 

 a lodgment on vines, it is difficult to dislodge or ex- 

 tirpate. The most effectual, and at the same time 

 simple, remedy known is thoroughly to smear the 

 affected vines with a mixture of coal-tar and clay, using 

 one part of the former to nine parts of the latter. The 

 clay should be dried and powdered, so that it may be 

 passed through a quarter-inch sieve ; then measure the 

 pulverised clay into a large fiower-pot (having a lump 

 of stiffish clay put into the hole in the bottom), using a 

 three-inch fiower-pot as a measure, and putting the 

 measure of tar into the vessel after the specified quantity 

 of clay has been deposited therein. Then work the 

 mixture well together, afterwards adding sufficient 

 boiling water to give it the consistency of ordinary 

 paint ; apply the mixture with a stiffish paint-brush to 

 every crevice about the spurs and every portion of 

 the affected vines, keeping the mixture well stirred 

 meanwhile. 



Red Spider (Tetranychus telarius) is caused by a high 

 and too dry atmospheric temperature being unwittingly 

 maintained, or by the soil being too dry at the roots of 

 the vines or plants affected, or by all three conditions 



