. Appendix to the Journals of the Senate and Assembly of the ... session of the Legislature of the State of California. nsects life. From the foregoing life history the two most vulnerable points toattempt its destruction are, in the spring while it is yet on the plumtrees, and in the fall before the male leaves the hop yards. Plum treesshould be sprayed to kill the lice before they migrate to the hop yardsin the spring, and all hop vines should be burned or drenched withkerosene as soon as the hops are removed, in order to destroy the male,which does not leave the hop yards until some time af
. Appendix to the Journals of the Senate and Assembly of the ... session of the Legislature of the State of California. nsects life. From the foregoing life history the two most vulnerable points toattempt its destruction are, in the spring while it is yet on the plumtrees, and in the fall before the male leaves the hop yards. Plum treesshould be sprayed to kill the lice before they migrate to the hop yardsin the spring, and all hop vines should be burned or drenched withkerosene as soon as the hops are removed, in order to destroy the male,which does not leave the hop yards until some time after the hops arepicked. Hop-growers should, if possible, not permit any wild or culti-vated plum trees to grow near their hop yards. As insecticides, keroseneemulsion and whale-oil soap may be used. The following is the formulafor the spray used in Oregon: Quassia chips, 8 pounds; whale-oil soap,6 pounds; water, 100 gallons. The quassia chips should be fresh andthe whale-oil soap not less than eight per cent strength. Spray as soonas the aphis appear, and continue as long as practicable. PLANT LICE, OR APHIDS. 133. Fig. 7. Peach Aphis. r BLACK APHIS OF THE PEACH {Aphis persica-niger). This aphis has proved very destructive to the peach trees of the Stateson the Atlantic seaboard, and as it exists in two forms—aerial andsubterranean, similar to the woolly aphis—its control is subject to allthe perplexities of the latter attacks the leaf buds when they arepushing in the spring, and so numer-ous do they become that they fre-quently kill young trees and seriouslydamage large branches on older following is the description of thisaphis by Alexander Craw, QuarantineOfficer and Entomologist of thisBoard: * It is of a shining black or very dark brown color. The legs aredeep brown on the thighs, the tips of the shanks and the tarsi; else-where yellowish. The cornicles or honey tubes are quite long, moderatelyslender and of the same color as the body. There is a ser
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