. Fumigation for the citrus white fly, as adapted to Florida conditions . roved sufficient to do this work, the costfor labor would be about 1 cent less per tree. In California contract-ors charge from 4 to 12 cents per tree for covering trees which can becovered without the use of the braced uprights or derricks. Theseprices include from the contractors standpoint: First, cost of labor;second, cost of wear and tear on tents; third, a reasonable prices stated above are exclusive of about 3 or Sh centsper pound usually allowed as payment for handling the cyanid, thechemicals
. Fumigation for the citrus white fly, as adapted to Florida conditions . roved sufficient to do this work, the costfor labor would be about 1 cent less per tree. In California contract-ors charge from 4 to 12 cents per tree for covering trees which can becovered without the use of the braced uprights or derricks. Theseprices include from the contractors standpoint: First, cost of labor;second, cost of wear and tear on tents; third, a reasonable prices stated above are exclusive of about 3 or Sh centsper pound usually allowed as payment for handling the cyanid, thechemicals being furnished by the owner of the grove. In estimating the expense for labor in fumigating a grove thereshould be included, in addition to the labor in connection with cover-ering the trees and generating the gas, an allowance for repairingtents, hauling chemicals and water, and miscellaneous work. Thisordinarily ranges from 1 to 4 cents per tree, according to size. LOSS1 S I K( M W II I I I KM ri;i.\ I I l». ECONOMY OF TREATMENT BY FUMIGATION. LOSSES —Whitefly (Aleyrodescilri): a, Orange leaf, show*ing infestation on under surface, natural size; b, egg; « , same, with young insect emerging; d, larval insect;e, foot of same; /, larval antenna; g, scale like pupa;h, pupa about to disclose adult insect; i. insect escap-ing from pupal shell; /. leg of newly emerged insect,not yet straightened and hardened. All figures ex-cept a greatly enlarged (reengraved from Riley andHoward). 1j>ss,s from tin ir/iih ihj. When once the white ll\ (figs. 8,9reduced to an inconsiderable quantity in a grove, much benefit willresult from careful inspec-tions and fumigations of sin-gle trees, or groups of trees,from time to time whereverthe insects are found to bemultipl) ing. Thisv* illgreatlydelay the time when the mul-tiplication of the insects shallhave made a general treat-ment again necessary. Thispractice is followed in Califor-nia in the control of variousscales.
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