126 



INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 



Description.— 

 bluish-gray and 



BAKER'S MEALY BUG 71 ' 



Pseudococcus bakcri Essig 



(Fig. 107) 



The bodies of the adult females are light gray to 

 covered with a thick, white, waxy powder which en- 

 tirely hides the color. The 

 lateral filaments are very short, 

 while those at the anal end are 

 from one fourth to one half as 

 long as the body. The eggs are 

 oval, pale yellow and laid in 

 loose, white, cottony masses. 80 



Life History.— The eggs are 

 deposited in loose cottony 

 masses similar to those of the 

 citrus mealy bug. This insect 

 does not multiply nearly as 

 rapidly, however, as the citrus 

 species. 



Nature of Work. — The 

 young and adults feed upon 

 the bark, foliage and fruit, but 

 prefer the new bark around 

 wounds. They also feed upon 

 the roots under the ground. 



Distribution. — Baker's 

 mealy bug is apparently quite 

 widely distributed throughout 

 the State. The author has col- 

 lected it in the southern and 

 central parts. 



Food Plants.— Apple, buck- 

 eye, elder, English ivy, Gre- 

 villea, lemon, Mexican orange, nightshade, orange, pear, potato, potato 

 vine. Japanese quince, wild sunflower, English walnut, grape and wil- 

 low are among the hosts. 

 Control. — Control measures are the same as for the citrus mealv bug. 



Fig. 107. — Baker's mealy bug, Pseudococcus 

 Essig, on pear. Twice enlarged. 

 (Original) 



THE CITRUS MEALY BUG 



Pseudococcus citri (Risso) 



(Dorthesia citri Risso) 



(Fig. 108) 



Description.— The bodies of the adult females are light yellow, 

 completely covered with a thick, white, waxy secretion and from £ 



"This eoccid was named the "Walnut Mealy Bug" in the previous edition and 

 changed because the large number of hosts attacked made it a misnomer. 



B °The mealy bug taken on the citrus trees at Upland, Cal., and designated as 

 Baker's mealy bug by the writer, differs considerably from the original type found in 

 Ventura County. On the dorsum there are four distinct rows of small depressions, the 

 two median rows being quite large. These depressions cause corresponding ridges. The 

 a. ix appendages are thicker and enlarged at the base. They form a sharp angle 

 much as the anal filaments of Pseudococcus crown (Coq. ). In other respects this 

 species greatly resembles the Ventura form. 



