An annual problem in the Papa Stronsay greenhouse is the Red Spider Mite (Tetranychus urticae). This mite is very small and reproduces rapidly. It feeds on the cell-material of all kinds of plants, killing the cells on which they feed. When gathered in their hundreds-of-thousands, you can imagine the havoc they can wreak in the greenhouse! We do not use chemical sprays in our greenhouse, so each year we have to introduce a second mite, Phytoseiulus persimilis, which is the natural arch-enemy of the Red Spider Mite. It can be ordered online, and arrives in the post!
Join Fr Jean Marie, F.SS.R. as he explains how it works.