THE GREEN-HOUSE. 



179 



is all that we can recommend. Fortunately it is not ^ 

 very common in green-houses. 



Various insects and diseases attack the peach tree, 

 as a black fly, the thrips, a very small insect like the 

 aphis, the acarus, a caterpillar, the curl, mildevr, 

 blight, and honeydew. The aphis and thrips, and 

 also the black fly, or any other of the fly kind, will be 

 effectually destroyed by tobacco smoke — the acarus, 

 by abundant watering over the leaves : the caterpillars 

 are few, and to be picked olF : the curl is occasioned 

 by minute insects, their kind is not correctly ascer- 

 tained, but it is prevented from increasing, by the 

 use of sulphur and watering, as are the blight and 

 honeydew. Some use the precaution of washing the 

 shoots of peach trees and vines with soft soap and 

 sulphur after they are pruned, — a precaution highly 

 necessary. 



The vine is attacked by the red spider, for which 

 the remedy is obvious ; the coccus sometimes appears 

 on the shoots ; and these are to be brushed off : but 

 rarely any other insect appears of an injurious nature. 



The bleeding of the vine may be treated as a dis- 

 ease ; our opinion is, that it does very little harm, and 

 that it may be left to take its course. 



What is called consumption in plants, is a disease 

 which gradually and sometimes quickly induces the 

 decline and decay of the plant till at last it dies. The 

 causes which produce it can seldom be correctly ascer- 

 tained ; sometimes it appears to proceed from improper 

 soil, climate, or culture ; at other times it comes on 



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