254 BLIGHTS IN FORCING HOUSES. 



growth; this pruning is best performed when 

 the shoots are about five or six inches long ; then 

 let the young shoots which have been retained 

 be trained in a regular manner to the trellis, &c., 

 and the training be repeated as the growth of 

 the trees may render it necessary during the 

 summer. 



BLIGHTS AND INSECTS ON TREES, HOW TO PRE- 

 VENT AND DESTROY IN FORCING HOUSES. 



Par. 41. Forcing houses are at times infest- 

 ed with small insects of various kinds, and the 

 fruit trees are at times seriously attacked, 

 blighting the leaves, and causing them to 

 crumple and shrivel, and the young shoots also 

 frequently become stunted, which often proves 

 very prejudicial to the fruit if not early attended 

 to, for when they appear, they generally increase 

 very fast. 



The most effectual way to prevent and destroy 

 them is by smoking the house with tobacco ; this 

 may be done with fumigating bellows, or occa- 

 sionally smoking the house thoroughly with a 

 smoking pot, with burning tobacco therein, 

 having a hole in the side to blow the tobacco 



