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parasites, insects and their larvse, such as above 

 described; while the other includes smut, mildew, 

 blight, rust and all similar, fungous or vegetable, 

 parasite growths, which we group under the 

 general name of Fungi. 



It is often not clearly evident to which of these 

 two classes, or whether, indeed, to either of them, 

 the trouble really belongs. Some believe it is an 

 insect which causes the "blight" in celery; but I 

 do not agree with that view. I know an insect 

 does appear on the leaves when they begin to 

 decay; but on almost every different kind of decay- 

 ing vegetation some one insect peculiar to it is apt 

 to appear, corresponding to saprophytes among 

 fungi being invited by the decay, but not the 

 occasion of it. 



And often, when the insects have made their 

 appearance and the leaves are already yellow, if 

 there is a sufficient application of water, either by 

 the occurrence of a heavy rain or artificially sup- 

 plied by irrigation, the insects will disappear, the 

 yellow leaves will drop away and the plants will 

 grow healthy again, with a good crop as the result. 

 The renewed vitality of the plant enables it to cast 

 off the morbid condition, however originating. 



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