| 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. |
| By the mid 1800s, the heads of chrysanthemum flowers were used to obtain pyrethrum, and rotenone was extracted from the derris plant. |
| The solution for all is to spray with derris immediately any problem is noticed, plus a precautionary spraying about a week before the plants flower. |
| 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. |
| This consisted of picking off the mature caterpillars and feeding them to the hens, and a liberal application of derris powder. |
