INSECTS INJURIOUS TO TOBACCO 



227 



The eggs are deposited singly in the tissues of the leaf and hatch 

 in about- four days. The young nymphs feed on the foliage, as do 

 the adults, and after moulting four times transform to adults about 

 eleven days later. Thus it requires but about a fortnight for the 



Fia. 161. The suck-fly (Dicyphus minimus): a, newly hatched; b, second 

 stage; c, nymph; d, adult; e, head and l>eak from side enlarged. 

 (After Howard, U. S. Dept. Agr.) 



development of a brood, so that the pest multiplies very rapidly 

 and in a few weeks becomes so numerous that hundreds are found 

 on a single leaf and serious injury is inevitable. 



The weather plays an important part in the control of this 

 pest, as many of the insects become stuck to the sticky exudation 



