. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. 75 TJie Littleton Experiment. — Mr. Homer Richards, a truck gardener and orchardist living in Littleton, offered the use of a one-acre field of winter squashes and, in addition, his assistance in the application of the sprays. The field contained twenty rows planted fifteen feet apart, and twentj'-five hills six feet apart in each row. Plots were marked off as follows: — Rows. Treatment. Rows. Treatment. 1-2 3-6 7-8 9-12 .... Check Black Leaf "40", 1-500 Check Lead Arsenate, 13-14 .... 15
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. 75 TJie Littleton Experiment. — Mr. Homer Richards, a truck gardener and orchardist living in Littleton, offered the use of a one-acre field of winter squashes and, in addition, his assistance in the application of the sprays. The field contained twenty rows planted fifteen feet apart, and twentj'-five hills six feet apart in each row. Plots were marked off as follows: — Rows. Treatment. Rows. Treatment. 1-2 3-6 7-8 9-12 .... Check Black Leaf "40", 1-500 Check Lead Arsenate, 13-14 .... 15-18 .... 19-20 .... Check Black Leaf "40", 1-100 Check Four applications were made: on July 5, July 12, July 19, and 26. Compressed air sprayers of three-gallon capacitj^ were used for the first three applications. Each was fitted \yith. a short spraA' rod and a 45° angle disc nozzle, pictured in figure 1. All portions of the plants were thoroughly sprayed, par- ticular attention being paid to the base of the stem. The fourth application was made with a power sprayer and one lead of hose bearing the short spray rod and angle nozzle. A pressure of 100 to 125 pounds per sciuare inch was maintained. Examinations to check the progress of the infesta- tion and the effect of the treatment were made by the writer on each trip to Littleton. On July 13, a count of eggs on about twenty-five plants in each treatment gave the following results: —. FiQ. 1. 45° Angle-disc Noz2le Used in the Experiments. Table IV. — Squash Vine Eggs at Littleton, Julij 13, 1923. Treatment. Eggs per Plant. Check 1 04 Black Leaf "40", 1-500 77 Lead Arsenate, Black Leaf "40", 1-100 .94 80 The difference in number of eggs exhibited by the check and treated plots is attributed to the mechanical effect of the spraj- in knocking some eggs from the plants. The writer has noticed frequently that while some eggs are firmly attached to the plants, others may be dislod
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