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My wife and I have tried to find a solution to a pyracantha problem. The plant has
developed black leaves and white chalky spots. She has applied a fungicide twice and
there has been no real change. What can she do to fix this problem?
The problem could be several things at once. Pyracantha can get fireblight which will
start on the tips and look like the plant was burned. The disease is spread during
bloom by honeybees, and no control other than cutting it out can be done once you
see the problem. Spider mites are also common problems on pyracantha and can cause
the leaves to look white or mottled. They tend to be worse when it is dry--and so
far this spring, it has been dry. I would suggest taking a plant sample in to your
local county extension office to get a proper diagnosis so that you use the correct
I have a very old (20 years) croton plant that has deep sentimental meaning to me.
This summer I put it outside and it was very happy and turned beautiful colors. However,
since I brought it inside, it has been dropping leaves. At first, I thought it was
just adjusting to the climate change, but today I noticed fine web-like stuff in the
crotches of the branches. as leaves continue to drop. I sprayed it with Neem oil and
washed off the webs with Murphy's oil soap. I also moved it into my greenhouse so
it can get more light and humidity. What else should I do to save it? Is there danger
of whatever is on it infecting my other plants in my greenhouse?
There is definitely a chance that the insects will move from one plant to another,
particularly in a closed environment of a greenhouse. It sounds like spider mites
to me. The Neem oil and the Murphy's Oil soap should definitely help, but keep it
isolated from your other plants and monitor it. Keep the soil on the dry side, but
try spraying the foliage with water periodically, as spider mites thrive when dry.
Don't expect miraculous new growth until the day length increases, but I would suspect
it will rebound. The more light they get, the more colorful their foliage. Good luck!
Each year I have tiny, black pests on the leaves of vegetables in my garden. They
cause damage to my plants and are difficult and expensive to try to control. They
are so tiny, they are almost invisible to the naked eye. You almost need a magnifying
glass. I can only see them if I cut off some leaves and shake the leaves on a piece
of white paper. Then I can see the tiny black dots move around. What are they and
how do I control them?
The most common insect in the garden is aphids. They can range in color from black,
red, green or yellow. They are small and tend to congregate near new growth or in
the joints of leaves. Flea beetles are also small, but tend to jump with vigor when
disturbed. Spider mites are really tiny but tend to be reddish in color. If aphids
are the culprit, they can be controlled with a strong spray of water, insecticidal
soap or Malathion. Be sure to follow label directions as to timing and harvesting.
For a definitive diagnosis of the insect, take some into your local county extension
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