Gardening in Africa: An Organic Insecticide

Wednesday, 15 April 2015

An Organic Insecticide

I came upon this organic insecticide on Witkoppen Wildflower Nursery's website -
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Here is a recipe for an organic insecticide that we have used with some success in the nursery to control Amaryllis as well psyllids (that cause those unsightly ‘bubbles’ in the leaves of many plants, notably citrus, Erythrina (Corral Trees) and Hypoestis (ribonbush).
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We got this recipe from Strilli Oppenheimer and Dawid Klopper, who have used the recipe in the Gardens at Brenthurst.
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Please note that this is an insecticide and is non-selective, so will kill the good guys along with the baddies.
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We try to spray our Clivias, Crinums and Nerines every 7 to 10 days. Use with care.

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Recipe:
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    4 Large onions
    1 Head of garlic cloves
    1 Handful of HOT chillies
    1 Tablespoon of dish-washing liquid
    1 Tablespoon of cooking oil

    Finely chop up the onions, garlic and chillies

    Add to 3 litres of boiling water, allow to stand overnight

    Strain and add the dish-washing liquid and cooking oil

    Mix 150 ml of fresh water to each 250 ml of the tea.
    Spray.

We substitute a tablespoon of Biogrow’s Bioneem or Pyrol for the tablespoon of cooking oil.
Just one more warning: do not wipe your eyes or touch any sensitive body parts, before washing your hands very well, during or after, cutting up the chillies. It may be very painful if you do!

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Tool tip

Properly maintained quality garden tools are a joy to use and can last for generations. And, like most things, an ounce of prevention is worth a pound of cure. Regularly cleaning and oiling your garden tools will prevent rust, keep them sharper, and allow the handles to stay strong. Start by giving your tools a good scrubbing to remove any mud and grit from the blades and handles. Dry with old towels, then set them aside overnight so they dry completely to avoid trapping moisture. Using a clean rag, apply lubricating oil to both the wooden handle and the metal blade. Rub the oil into the surface then wipe off any excess. The oil will help prevent rust and condition the wood to keep it from absorbing water and prevent cracking. After the handle has dried, apply a second coat of oil to the wood if needed. Tools with fiberglass or composite handles will only need a good cleaning.

Wildlife Tips

PUT UP AN OWL BOX : Owls aren't common garden visitors for most, but if you know they are around, it's worth providing extra nesting sites. General Owl boxes are bigger than ordinary bird boxes. They're shaped according to the needs of the species. Barn owl boxes are large and square, or sometimes triangular, with a ledge outside the entrance for young owls to stand on. Barn owls like to nest in a solitary tree on the edge of woodland, between 3 and 5m above the ground. Keep out cold drafts by facing all owl boxes away from prevailing winds. It also makes it easier for parents to fly to the entrance. If you fix the owl box to a tree, use a strap to keep it in place so you don’t damage the trunk. As with all nest boxes, do not disturb the box for cleaning until you are sure that the young have left. Tawny owls in particular can be aggressive when protecting their young. Don’t be disappointed if your box stays empty for the first year. Birds often choose a nesting site during the autumn, winter or early spring. Leave the box where it is for the winter and it could be a nice dry place for birds to roost when the weather’s bad. Please do not unnecessarily disturb the birds and never remove any eggs from the nest.

Leave those leaves! I know many gardeners don't like the 'messy' look of fallen leaves, but they have a lot of benefit to wildlife and your garden. Many wildlife species live in or rely on the leaf layer to find food and other habitat, including toads, shrews, earthworms and many insect species. From a gardening perspective, fallen leaves offer a double benefit. Leaves form a natural mulch that helps suppress weeds and at the same time fertilize the soil as they break down. Why spend money on mulch and fertilizer when you can make your own?

More about me

I've been gardening ever since a child, when I spent time with my father in his vegetable garden. But my fascination with Echeverias started in the 1980's, when my father gave me a pot with five Echeverias, which turned out to be E. imbricata. At first I wasn't much interested in them and planted them in some obscure corner of the garden and completely forgot about them. How great was my surprise when, a couple of months later, I noticed that they had spread and made a beautiful display - I was hooked!

It is utterly forbidden to be half-hearted about gardening. You have got to love your garden whether you like it or not.

- W.C. Sellar

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Wednesday, 15 April 2015

An Organic Insecticide