Walnut aphids in California . The Ashy-Gray Ladybird (Olla abdominalis).[A, adult; B, eggs; C, larva; D, pupa. (After Essig.) ] Bui 100, U. S. Dept. of Agriculture. Plate Fig. 1 .—Tree of the Royal Hybrid Walnut in Grove of Mr. F. Leib, San Jose, Cal. T^L^ Jt. W *5F 1 v^^tfa—„^_ - 1 | Fig. 2.—General View of Walnut Grove of Mr. F. Leib, San Jose, Cal WALNUT APHIDES IN CALIFORNIA. 41 Commercial lime-sulphur, 1-50, combined with commercial tobacco extract No. 1,1-200, effective. Commercial lime sulphur, 1-70, combined with commercial tobacco extract No. 2,1-1,000, effective. Commercial lime
Walnut aphids in California . The Ashy-Gray Ladybird (Olla abdominalis).[A, adult; B, eggs; C, larva; D, pupa. (After Essig.) ] Bui 100, U. S. Dept. of Agriculture. Plate Fig. 1 .—Tree of the Royal Hybrid Walnut in Grove of Mr. F. Leib, San Jose, Cal. T^L^ Jt. W *5F 1 v^^tfa—„^_ - 1 | Fig. 2.—General View of Walnut Grove of Mr. F. Leib, San Jose, Cal WALNUT APHIDES IN CALIFORNIA. 41 Commercial lime-sulphur, 1-50, combined with commercial tobacco extract No. 1,1-200, effective. Commercial lime sulphur, 1-70, combined with commercial tobacco extract No. 2,1-1,000, effective. Commercial lime-sulphur 1-45, combined with commercial tobacco extract No. 2,1-2,000, effective. It is noticeable that the weaker solutions of tobacco extracts werenot effective alone, but when combined with distillate-oil emulsion orlime-sulphur proved quite satisfactory. Possibly the most success-ful result was obtained with distillate-oil emulsion of only 2 per experiments failed, however, to justify the use of this wash alone,for it proved to lack the killing power found in the tobacco-extractsprays. The emulsion serves, however, as a very good spreaderfor the
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