Materials | Methods of preparation | How to use | Target pests |
Giant knotweed leaf extract
Giant knotweed leaves Water Grinder Pail |
Collect the upper ground parts of the plant especially the leaves. Dry the leaves. Grind them. Add 10 grams of the grounded leaves into 1 liter of water. nLet it stand for 1 hour or a little bit longer. Strain to get a clear extract. Use the plant extract immediately, never set it aside for the future use. |
Generally, the extract is sprayed as a plant strengthener at 1 week interval. For example; on tomato, 2 weeks; on cucumber, 1 week; and on grape, 10 days interval. Spray the plants at the latest immediately when you see the first spot or lesion on the leaves, otherwise the extract is no longer effective when the infection has widely spread. |
Powdery mildew on tomato, pepper, cucumber, grape, begonia Botrytis on young tomato, pepper, and ornamentals |