BEAN. 



BEAN APHIS. 



to receive them, has been recommended ; but it is desirable 

 that some mixture of mud or soot and water or smearing of 

 tar, which would almost certainly act well in retaining them, 

 should be provided for them to fall into, or they would soon 

 escape. 



Strewing the plants well with unslaked lime early in the 

 morning, whilst the dew is still on, is also recommended. 



BEAN. 



Bean Aphis. Aphis rumkis, Linn. ; A. fabiv, Kirby & Speuce. 



1, Bean-shoot, with Aphides ; 2, male Bean]"Aphis, magnified ; 3, nat. size ; 

 4, wingless female, magnified. 



The Bean Aphis (known also as "Black Fly," "Collier," 

 and " Black Dolphin ") sometimes appears in such vast 

 numbers as to smother the Beans, making them look as if 

 they were coated with soot. The attacks are begun by a few 

 wingless females establishing themselves near the top of the 

 Bean-shoots, where they produce living young. These in 

 their turn are soon able to produce another living generation ; 

 and so on, and on, till the increase is enormous, and from the 

 numbers of the " Black Fly," and the sticky juices flowing 

 from the punctures which they have made with their suckers, 

 the plant becomes a mere dirty infested mass, with a few 

 diseased leaves sticking out from amongst the plant-lice. 



These Aphides are very similar in shape throughout all 

 their stages, excepting that in the first and second (which 



b2 



