. Bulletin of the Department of Agriculture. Agriculture. 26 BULLETIN 550, U. S. DEPARTMENT OF AGRICULTURE. very poor adhesive. Arsenate of lead at the rate of 2\ pounds (powder) to 50 gallons of liquid (Plat II) appeared to be little more effective at the increased strength than when used at the rate of 1^ pounds to 50 gallons (Plat I). Plats where the first application was made with "set nozzles" (Plat IV) and where it was omitted altogether (Plat V) showed a fairly satisfactory reduction of infestation. It should be noted that the infestation in the checks in these two plats
. Bulletin of the Department of Agriculture. Agriculture. 26 BULLETIN 550, U. S. DEPARTMENT OF AGRICULTURE. very poor adhesive. Arsenate of lead at the rate of 2\ pounds (powder) to 50 gallons of liquid (Plat II) appeared to be little more effective at the increased strength than when used at the rate of 1^ pounds to 50 gallons (Plat I). Plats where the first application was made with "set nozzles" (Plat IV) and where it was omitted altogether (Plat V) showed a fairly satisfactory reduction of infestation. It should be noted that the infestation in the checks in these two plats was not as heavy as that in the checks adjacent to Plats I, II, and III. EXPERIMENT IN THE PHILLIPS VINEYARD, NORTH EAST, PA., 1916. A/0/P7S? tv/r^r. £XST SOC/7-/Y Fig. 9.—Diagram, showing the arrangement of ex- perimental plats in the vineyard of Mr. M. D. Phillips, North East, Pa., 1916. The sprayed plats are marked with Roman numerals and the check plats with letters. (Original.) infestation unsprayed checks were The arrangement of plats is shown This vineyard consisted of Ni- agara grapes, whereas in all other vineyards in which experimental spraying was done the grapes were Concords. It covered about two acres, irregular in shape, and was divided into two plats. To guard against natural irregularities of left in each of the three corners, in the diagram (fig. 9). Table 18.—Spray mixtures used and methods and dates of application, Phillips vine- yard, North East, Pa., 1916. Dates sprayed. Arsenate of lead (paste). Bordeaux mixture. Laundry soap. Water. Method of application. Plat No. Lime. Copper sulphate. 1 1 July 5 and 11 July 5 and Pounds. 5 3 Pounds. 3 3 Pounds. 3 3 Pounds. 1 1 Gallons. 50 50 "; Do. Table 19.—Percentage of infestation in experimental plats, Phillips vineyard, North East, Pa., 1916. Number of clusters. Total berries. First brood. Second brood. Plat No. Infested berries. Infesta- tion. Infested berries. Infesta- tion. 4
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