Thripicide

The importance of the thrip has led to my arranging with Prof. Quayle and the Walnut Growers Association Spray Company to conduct demonstrations in the use of certain dust sprays believed to be effective thripicides, and less expensive than lime-sulphur.

Oil sprays uncombined with lime sulfur appear to have little value as thripicides.

All recommendations known to the authors for the use of this material as a thripicide specify solutions of or near 1 to 1,000.

This pest management strategy may be accomplished through: 1) applying thripicide(s) only when thresholds are reached;