508 CITRUS FRUITS AND THEIR CULTURE. 



AleyrodidaB. The adult insect is covered with six large 

 plates, three upon each side, and three smaller plates, 

 located one at each end and one in the centre. The wax 

 finally becomes covered with dust and dirt, giving it 

 an appearance quite different from that possessed when 

 its development was just completed. 



There are about three broods, each extending over 

 three or four months. The first brood occurs in April 

 and May, the second in July and August, and the third 

 in October and November. This insect is native to Flor- 

 ida, and is very commonly found upon gallberry in great 

 numbers. It also occurs upon quince, apple, pear, the 

 citrus fruits, ferns, figs, myrtles, guavas and a number 

 of other plants. As the insects become aged many of 

 them fall to the ground and perish, being unable to re- 

 ascend the plants from which they fell. The insect does 

 not often become numerous upon orchard or grove trees, 

 but sometimes gets thick enough to cause some alarm. 



Treatment. It is not often that the wax scales re- 

 quire particular attention, but we have some reports 

 indicating that they may inflict considerable damage dur- 

 ing a short period. If fully developed, they will prob- 

 ably lose their hold and fall to the ground in a short time, 

 so are not worthy of much attention while in this stage. 

 When the growing larvae become numerous they can be 

 checked by an application of resin wash, kerosene emul- 

 sion or whale-oil soap if made while very young. 



The Barnacle Scale, (Ceroplastes cirripediformis 

 Comstock). This insect agrees with the preceding spe- 

 cies in possessing a white, waxy covering, but is differ- 

 ently marked. The average length is 0.20 of an inch 

 (5 mm); width, 0.16 of an inch (4 mm), and height. 



