| Second, spray the tree with derris, which is widely available, when roughly half the flower petals have fallen. |
| Jam laced with derris, camphor, citronella or pepper also makes an effective bait. |
| Rotenone has been developed as a commercially prepared product from derris plant roots and has become one of the best studied natural toxic compounds. |
| This consisted of picking off the mature caterpillars and feeding them to the hens, and a liberal application of derris powder. |
| Pyrethrum and derris are short-lived, mild natural insecticides that poison insects. |
| For rotenone is no post-war insect killer cooked up in a corporate lab, but a natural product, extracted from the derris plant, and a mainstay of organic farms and gardens. |
