PESTS: HOW TO KEEP OIL IN HERBS
When you think of all the pests that menace garden flowers and vegetables, the score for herbs is very low, perhaps owing to the potency of their aromatic oils, many of which insects of all descriptions cannot stand. So great is their dislike for garlic chives, tansy, rue, lavender, santolina, that they will never come near them; so these herbs together can be made into a very powerful insecticide. Wormwood and southernwood are other pungent herbs which no predator will eat or destroy, because of the strong smell of ether given off from their foliage.
So in this way these herbs can help keep the rest of the garden free of pests if planted amongst the flowers and shrubs, and if bruised gently to free their aromatic oils. One large rose nursery, now sells plants of garlic chives with each rose order, to keep the aphis away and increase the perfume of the roses. It really works!
If you have only a small herb patch, insects are best removed by hand. This does not involve much time or trouble, and you know then you have herbs in perfect condition for the table or the hot “brew”. However, if you cannot keep an eye on the plants each day, you may prefer to spray or dust them with several of the following:
Derris dust is a pure organic powder made from the derris root. It kills on contact caterpillars and grasshoppers, but is even more effective when mixed with pyrethrum (Pyrethrum cinerariafolium), the South African plant which now figures largely in many proprietary insect sprays. Incidentally, this plant is not the ordinary white garden Pyrethrum Daisy, which has no effect on insects at all. If you can obtain both of these unadulterated by chemical additives, you can spray or dust your herbs just before dusk, and have them safe by morning, ensuring that the bees will not be driven away or killed too. Both these preparations have been extensively tested and found to be safe for human or animal consumption, provided the recommended instructions as to the amount to be used are followed.
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