Novice gardener needs help: Anyone know the best organic solution for the black aphids I've found on my peas?
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M$3 Answers
To foil aphids: flatten a square of aluminum foil around the base of plants to bounce light on the undersides of leaves. This also helps the plants in giving them more light.
Try a barrier of powdered charcoal, calcium dust or bonemeal to keep them away from your plants.
Stinging Nettle Spray: Aphids & Thrips - Cover 1 quart nettles with water, cover and ferment for 3 weeks. Mix 1 part nettle tea with 7 parts water. Spray.
Spread out a barrier of tansy around the base of the plant to stop those ants.
Use a spray made from a tea of tomato or potato leaves and water.
Chop 12 or so tomato leaves and 1 chopped onion in 1/2 cup of of 70% isopropyl alcohol for a few minutes. Apply the mixture directly on aphids with a cue tip or paintbrush.
A forceful spray of water is often enough to knock the aphids off the plant and may discourage the ants, well sometimes.
Put a bright yellow plastic pan in a strategic spot in the garden. Fill it a third of the way full with water. Aphids are drawn to the yellow color, land on the water, sink and drown.
A soap spray can be used to strip them of their protective wax coating, dehydrating them. Mix 1 tablespoon of Castile soap to 1 gallon of water, spray.
Garlic oil spray can kill aphids and other soft bodied pests.
A dusting of diatomaceous earth is lethal to aphids. Wear a mask when using DE.
Teas made from elderberry or rhubarb leaves can act as a deterrent. Oxalic acid is the compound present in these plants that makes a spray effective. It is poisonous.
Place banana peels at the base of infested plant. The peels give them a shot of potassium too!
Or you could purchase some Lady Bug's or Praying Mantis as a predator insect.
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M$So in your case, the Aphid has many enemies, except the enemis have not had time to develop yet, so the Aphid population has increased dramatically in the early spring. When the Ladybugs start to come out, the Aphids will supply plenty of yummy food for the Ladybugs, as they can eat many Aphids.
In the mean time, until the Ladybugs(and other enemies) can get big enough to eat the Aphids, take your water hose and spray(lightly enough not to injure the plant) the infected plants. This will wash off the Aphids and throw them to the ground. It will take the Aphids a long time to get there bearings back and find the plants.
Use this method until the Ladybugs can get the Aphids and you will have proteceted your plants without harmful pestisides!
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M$