Posts Tagged: aphids
Oh, Those Pestiferous Aphids!
By now, you're probably seen enough aphids to last you for the entire year. That's why we're looking forward to hearing Bryony Bonning speak on...
Pea aphids on a rose leaf. (Photo by Kathy Keatley Garvey)
Pea aphids claim a rose stem. (Photo by Kathy Keatley Garvey)
Ladies (and Men) in Red
Two ladybugs, aka lady beetles, circled their little house, a 1.5-inch plastic container punctured with air holes. Up. Down. Down. Up. In a way, they...
Ladybug devouring an aphid on a rose bush. (Photo by Kathy Keatley Garvey)
And Life Goes On...
The tender shoots of fava bean blossoms are attracting scores of aphids, which suits the ladybugs just fine. Nothing like an all-you-can-eat aphid...
Ladybugs in the fava beans at the Haagen-Dazs Honey Bee Haven, UC Davis. (Photo by Kathy Keatley Garvey)
Note the scores of aphids behind the ladybugs. (Photo by Kathy Keatley Garvey)
Ladybug crawls past some aphids. (Photo by Kathy Keatley Garvey)
Oops,I did it again...More Confessions from a Master Gardener
One spring, I had a terrible aphid infestation on my rose bushes. I tried and tried to get rid of them naturally. I sprayed them with water to knock them off. I sprayed soapy water. I tried oils and “all natural” sprays, and powders from the local nursery and specialty mail order catalogues before online shopping became popular. But nothing I did could help to get rid of those darn aphids. I was vastly outnumbered, and I didn’t like it! They called out the cavalry and they were winning this war!
After several exhausting weeks of fighting a battle with aphids, I finally gave up and purchased a chemical spray. I generally don’t use chemicals sprays, but believe me, short of setting the roses on fire – I tried everything natural I could get my hands on! I figure I’m going to get suggestions on alternative methods and products to get rid of aphids. Well, normally they work for me, too but that will have to be another blog…
So years later, I realized that the entire aphid infestation had been my own fault. During fall, I had planted daffodil and tulip bulbs and few scented geraniums in the spaces between the roses. I put bone meal and time release fertilizer when I planted the bulbs. I fertilized the scented geraniums when I planted them. Then in spring, I fertilized the newly sprouting rose bushes, and additional fertilizer on the bulbs and geraniums. With all that fertilizer and nitrogen, the roses burst forth with lots of new growth, tender shoots, buds and foliage! The roses were over-fertilized. All that new growth provided the perfect food and environment for all those hungry little aphids. I had created an aphid’s utopian Shangri-La, no wonder they didn’t want to leave!
No matter how much commercials that try to convince you to that more fertilizer is better, that is simply not the case. Plants that are over-fertilized grow like crazy in early spring. The sudden and fast growth produces too many shoots and leaves causing the overall plant to be weaker plants. Weaker plants can’t fight off bugs and diseases as easily as healthy plants that growing in a more optimal environment. Also, all that extra fertilizer can run off and pollute our local streams, waterways and get into your drinking water, I much more careful and aware about the fertilizer that goes on, in and around all my plants in my garden. I have managed to keep the aphids away from my roses by preventing the problem before it starts.
Betty Boop rose. (photos by Esther Blanco)
Bud of Betty Boop rose.
Aphid Farming
I’ve been walking past this Pittosporum tobira ‘Variegata’ for at least five years now. It’s in my ‘kitchen’ raised bed, which should have become a vegetable bed, but, lacking enough sun and requiring major soil amendment, became a place to put plants that I could see from the kitchen. The pittosporum made its way there under false pretences. It’s supposed to produce sweet-smelling white flowers, but its attractive branch structure and variegated leaves are more interesting.
I’ve been pruning it back periodically, because it is really too big for the space, but my husband likes its location (hence the pruning). A few weeks ago, in a vain search for possible flower buds, I noticed that the new growth had aphids. Not only aphids, but a full complement of ants. It didn’t surprise me, but it means I will have to take some action.
Usually when there are aphids on my roses (which, in Quebec only happens in the spring), I wipe them off or remove them with a blast of water from the hose. If I feel it’s necessary, I’ll use some insecticidal soap solution, but that is rare. Of course, in California it seems as though it’s always spring, and pruning stimulates new growth. If you prune and fertilize, you’ll get lots of fresh, leggy, sweet-tasting new shoots.
Obviously, the aphids arrived before I noticed them. Aphids suck fluid from the leaf tissue, and they are often seen on new, fresh growth. As all living creatures do, they excrete unusable material called honeydew, and ants thrive on it.
So, the ants followed the honeydew trail, and they are "farming" the aphids for their that substance. They protect aphids from predators, like any good farmer, ants protect a food source, and they eat the aphid excrement. Now I have a dual problem. I’ll let you know what I do to solve it!