What pressure is necessary for potato spraying?

Summary

Potato spraying experiments in New Jersey, conducted for 17 years, have demonstrated that this practice pays.

Bordeaux mixtures made from a high grade chemical hydrated lime will give as good results as a Bordeaux mixture made from stone lime.

Calcium arsenate will not control the flea beetle or the leaf-hopper. On the other hand, the injury from both of these insects and particularly the latter, will be greatly reduced by spraying with Bordeaux mixture.

Increased yields followed applications of Bordeaux mixture applied at 150, 250, and 350 pounds pressure. While the yields increased with the pressure the difference between, 250 and 350 pounds was slight and it is believed that a pressure in excess of 250 pounds is unnecessary. With 200-250 pounds pressure and proper adjustment of the boom and nozzles, satisfactory results will follow.