. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. 75 Tlie Littleton Experiment. â â 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 twenty-five hills six feet apart in each row. Plots were marked off as follows: â Rows. Treatment. Rows. Treatment. 3-6 7-8 9-12 .... Check Black Leaf "40", 1-500 Check Lead Arsenate, 13-14 .... 15-18 .... 19-20 ....
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. 75 Tlie Littleton Experiment. â â 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 twenty-five hills six feet apart in each row. Plots were marked off as follows: â Rows. Treatment. Rows. Treatment. 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", Check 1-100 Four applications were made: on July 5, July 12, July 19, and July 26. Compressed air sprayers of three-gallon capacity were used for the first three applications. Each was fitted with a short spray 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 apphcation 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 square inch was maintained. Examinations to check the progress of the infesta- tion and the effect of the treatment were made by the -vmter on each trip to Littleton. On July 13, a count of eggs on about twenty-five plants in each treatment gave the following results: ââ. Fig. 1. 45° Angle-disc Nozzle Used in the Experiments. Table IV. â Squash Vine Eggs at Littleton, July 13, 1923. Treatment. Eggs per Plant. Check Black Leaf "40", 1-500 .77 Lead Arsenate, .94 .80 The difference in number of eggs exhibited by the check and treated plots is attributed to the mechanical effect of the spray in knocking some eggs from the plants. The writer has noticed frequently that while some eggs are firmly attached to the plants, others ma}^ be dislodged at a touch. The difference exhibited between the lea
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