| By the mid 1800s, the heads of chrysanthemum flowers were used to obtain pyrethrum, and rotenone was extracted from the derris plant. |
| The insecticidal properties of Derris roots were first discovered in 1848 and the plant was first used against the nutmeg caterpillar. |
| Spray blackcurrant and gooseberry bushes with derris to protect from mites, aphids and sawfly. |
| Mr Maloney's attempts with Derris Dust have not worked because the chemical is not designed to kill worms, only what it says on the box. |
| Pyrethrum and derris are short-lived, mild natural insecticides that poison insects. |
| This consisted of picking off the mature caterpillars and feeding them to the hens, and a liberal application of derris powder. |
