Abstract: There is disclosed a unit dosage system for tree trunk implantation to control insect pests afflicting trees in which a plurality of vertically spaced apart holes (about 10-15 cm) preferably 10 holes, are drilled into the trunk and the holes are filled with about 0.1 to 2.0 gram unit dosage weights (as 100% active ingredient) of N-Acyl phosphoroamidothioates in a capsule as disclosed in Jensen U.S. Pat. No. 3,706,161. The active compounds are O-methyl or ethyl S-methyl or ethyl N-acetylphosphoroamidothioate which are technically pure (over 80%) and whose method of preparation is shown in Magee U.S. Pat. No. 3,716,600. A feature of the system is the provision of 10 capsules loaded with the active compound in a double or triple package within a package, each package being hermetically sealed to permit storage and shipment without giving off hazardous vapors. The inner package is a heat sealed metal foil lined package hermetically enclosing 10 capsules of the Jensen structure.

Abstract: A tree medication capsule is disclosed as including a vial having a medication sealed therein by means of an end cap; the vial, medication and end cap constitute a self-contained unit which is inserted into a predrilled hole in a tree. The vial is made of frangible material so that upon breaking, as by a mallet tap on the end cap, the medication is free to escape into the tree.