APHIS 



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Plants may be fumigated out of doors by the aid of a tarpaulin, 

 but it is a troublesome business, and either tobacco powder or a 

 wash may be employed to advantage. To prepare a wash, steep shag 

 tobacco in hot water at the rate of four ounces to the gallon, and 

 add a little size. To economise this mixture, it is advisable to dip 

 the plants ; but if this is not practicable, syringe the plants, taking 

 care to wet the under as well as the upper sides of the leaves. We 

 have seen Plum trees literally blue with Aphis rendered perfectly 

 clean by a solution of common glue, at the rate of a quarter of a 

 pound to the gallon of water, with a little flowers of sulphur added. 

 After being well wetted with this cheap mixture, the trees shone as 

 if varnished, and the mixture was not washed off, because it soon 

 cracks and peels off naturally, and trees being freed from fly begin 

 to grow again vigorously. Rose trees may generally be cleansed 

 of fly by means of the garden 

 engine and pure water only, the 

 essential point being to direct the 

 water on the trees with some 

 amount of force for several even- 

 ings in succession, at the time 

 when the fly threatens to get 

 ahead. Quassia is often used 

 instead of tobacco, but it is un- 

 certain in its operation, and there- 

 fore, although we know it is at 

 times effectual, we cannot give 

 it a general recommendation. 

 The same maybe said of Socotrine 

 Aloes, which sometimes kills the 

 fly, and sometimes leaves it un- 

 hurt. These drugs vary in quality, 

 but strong tobacco never fails to 

 do its appointed work. 



THE PEA SIPHON-APHIS 

 (Siphonophora pisi, Kalt ). 

 Amongst the aphides peculiar 

 to vegetables, this is one of the 



most common. Our illustration shows natural size and enlarged 

 figure of the greenish-winged and green-tinted wingless females, as 

 produced, not from eggs, but alive and developed. This insect is 

 occasionally very destructive to Pea crops. 



PEA SIPHON-APHIS 



Siphonophora pisi 



