144 



THE MONTHLY BULLETIN. 



Food Plants. — The principal food plants of economic importance are 

 citrus trees, but the following are some of the other principal ones: 

 Umbrella tree {Melia azedaracli), Chinaberry {Melia azedarach um- 

 hraculifera) , Cape jessamine, yellow jessamine, privets, Japan persim- 

 mon, lilac, coffee, English ivy, rubber tree, bay, tree of heaven. Cape 

 myrtle and many minor ones. 



Control. — By far the most effectual control measure is fumigation, as 

 used for scale insects, two thirds of Schedule No. 1 being recommended. 

 Emulsions and resin sprays are also effective remedies. 



THE COMMON OR GREENHOUSE WHITE FLY. 



Aleyrodes vaporariorum Westw. 

 (Pig. 127.) 



General Appearance. — The adult white flies are about three fiftieths 

 of an inch long, the males being slightly smaller than the females. The 

 bodies are yellow and the wings pure white. The eggs are exceedingly 



Fig. 127. — The common or greenhou.se wliite fly {Aleyrodes vaporariorum Westw.). 

 a, egg ; b, young larva ; c, pupa, top view ; d, pupa, side view ; e, adult. All greatly 

 enlarged. (After Morrill.) 



small, oblong in shape, at first light green, growing black with age and 

 attached by a short stipe. The larvae are light in color, transforming 

 to fiat pupffi about three hundredths of an inch long; oblong-oval in 

 shape ; light green and supporting noticeable wax-like rods or spines, 

 which makes this species readily distinguishable from all others. 



Life History. — The eggs are laid upon the leaves of the plants, each 

 female depositing over one hundred. These hatch in about two weeks 

 into larvffi which begin feeding verj^ shortly and after three moults, 

 covering nearly a week, they become pupse, which after two more weeks 



