|Materials||Methods of preparation||How to use||Target pests|
|Giant knotweed leaf extract
Giant knotweed leaves
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.
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