BY HENRY TRYON. 
5 
The injury under notice is occasioned by the fly whilst the 
latter is in the maggot condition, but the plant supports the 
insect during every phase of its existence, its transformations 
being undergone within its tissues. Beans affected by this 
redoubtable pest present the following features : — The plants 
affected — and the injury may be evinced when they are less than 
a fortnight old— fail to make the amount of growth which they 
do when in a healthy state. They are altogether stunted, and 
oftentimes break off level with the ground. They may also 
flower, but if any pods are borne these are few in number, are 
very much twisted, swollen in different parts, and do not exhibit 
the usual crispness in fracture. From the point where the roots 
originate to where the plant emerges from the ground there is 
almost complete decay, and immediately above this the stem is 
irregularly swollen, becoming less so in passing upwards to the 
extremity of the branches. The epidermis covering the swollen 
part is generally fissured, especially near the ground, and these 
fissures in favourable seasons may emit adventitious roots, 
which, how^yef, seldom reach the soil. It is also light-brown 
or browniSi white in colour, and separable, presenting the 
appearance of being injured through instant contact with some 
blistering or corrosive liquid. If the plant has been for some 
time subjected to the attacks of the bean-maggot aU its branches, 
and even the peduncles of its flowers as well as its leaf stalks, 
are similarly injured, each part presenting, however, to a certain 
extent, special features. The branches, besides being thickened, 
are usually shortened, and more or less contorted, so also are 
the leaf stalks, and both may break off through being decayed 
I at their point of insertion. On removing a portion of the 
' epidermis in any part affected the pest will be brought to light, 
maggots of small dimensions — or their pupfe — ^being everywhere 
met with. 
The maggot is a translucent, yellowish, elongate, cylindrical, 
twelve-jointed grub, obtuse at each extremity, and rather 
broader towards the head ; it measures to lines in length. 
The puparium is a parallel- sided object rounded at each end 
and about 1 line in length. If the injury is of long continu- 
ance it will be observed, in exploring the plant from the base 
