APR.] GRAPES. 373 



Let the engine be freely and regularly exercised 

 on the foliage throughout the summer, both to re- 

 fresh it, and to keep down the red spider. Examine 

 the young leaves and points of the shoots with a 

 glass, whenever you perceive them begin to curl up, 

 turn brown, or anywise become discoloured. It is 

 most probably caused by the thrips, an insect ex- 

 ceedingly mischievous to grapes, particularly in a 

 pine, or other stove, and often in the vinery, in hot 

 weather*. It may be destroyed by a fumigation 

 with tobacco, in the same manner as the green fly ; 

 but the fumigation must be stronger, and longer 

 persevered in, and perhaps may require to be re- 

 peated. See fumigating the cherry-house in Fe- 

 bruary, 



Of forcing established plants in the Grape-House. 



If the directions given in the two preceding 

 months have been observed, the plants will be out 

 of flower by the first of this, and the berries be- 

 ginning to make their appearance. The tempera- 

 ture must be continued, and be kept up to about 

 75, by fire-heat. As the fruit begin to swell, 

 large quantities of water must be given once in 

 t\vo days, or moderate quantities every day, in or- 

 der to further their progress, and that they may be 

 produced in perfection, plump, and full sized. 



* Sec more concerning the Thrips, at the article Destroying 

 Insects, in the Fruit Garden for April. 



