. Bulletin of the Department of Agriculture. Agriculture. 4 BULLETIN 1040, U. S. DEPARTMENT OF AGRICULTURE. HOST PLANTS. The citrophilus mealj-biig is of importance commercially prin- cipally because of its infestation of citrus plants. The insect does occur, however, on a large number of other plants, principally orna- mentals, upward of 30 different species being listed as hosts. On the citrus fruits it possibly shows its most rapid develop- ment on lemons, fol- low ered by grape- fruit, navel oranges, and Valencia or- anges, in the order given. It has been observed to develop very rapi
. Bulletin of the Department of Agriculture. Agriculture. 4 BULLETIN 1040, U. S. DEPARTMENT OF AGRICULTURE. HOST PLANTS. The citrophilus mealj-biig is of importance commercially prin- cipally because of its infestation of citrus plants. The insect does occur, however, on a large number of other plants, principally orna- mentals, upward of 30 different species being listed as hosts. On the citrus fruits it possibly shows its most rapid develop- ment on lemons, fol- low ered by grape- fruit, navel oranges, and Valencia or- anges, in the order given. It has been observed to develop very rapidly on the rhubarb, potato, :evillea, walnut, grape, and on species of Coleus and Fig. 2.—The citrophilus mealybug the female. Immature stages of DESCRIPTION AND LIFE HISTORY. The synonymy of the citrophilus mealybug was first correctly de- terminated by G. F. Ferris in August of 1919.^ As stated, this insect was first con- fused with the com- mon mealybug and later, by Essig, with Baker's mealybug. Clausen, in Septem- ber, 1915. noted cer- t a i n differences in him to describe it as characters which led a new species {P. cit- rophilus) but Ferris found that the same insect had been de- scribed by Mr. E. E. Green during May, 1915, as P. specimens taken from Rihes sanc/uinea in London, England. Un-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Department : Supt. of Docs. , Govt. Print. Off.
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