Report of the United States Entomological Commission for the Years United States Entomological Commission (Volume 4) (Paperback)

This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1885. Not illustrated. Excerpt: ... heights. The ratchet for vortical adjustment subserved this purpose satisfactorily. Whore it is desired to spray the base and interior of the plants from beneath, the nozzle arms must necessarily be carried near or on the ground, and with medium to small cotton this method also sprays the top sufficiently well, but if the growth be heavy and dense it proves better to set the forks higher for more thoroughly poisoning the tops. The stirrer pump worked admirably; but a larger pump of the same kind was necessary to treat a greater number of rows, to ascertain how largo a number it is possible or advisable to spray at a time. While the large pump was being constructed and shipped the time limited by my orders expired. Four rows may be set as the number it is most practical to treat at a time with the kind of machine in question. The springs of the fork-arms should be larger and have a longer bend than in the samples taken, since the unyielding attachment of the stem-pipes to the still" supporting pipe above throws on the springs much greater strain than occurs in the machines having descending parts hung to operate independently of each other. Until my time had expired worms were not abundant enough to study the effects on them of the coarser and finer sprays applied, buf the coarser spray was more injurious to tho foliage with poisons, and still more so with petroleum. The standard form of eddy-chamber nozzle was used with discharges of different sizes. The smallest discharge holes, of DEGREES to -fe of an inch diameter, with very high pressure, gave the most satisfactory results. The "actual cost, and the actual area covered by a given amount of liquid," vary greatly with the width between the rows, tho sizes of the sprays and of the plants, with the number of nozzles, ...