Plant Diseases
The Most Common Problem
Botrytis. is the most common fungus (pictured on this geranium) in the world.
It takes many different forms from a simple gray mould on geranium flowers to blotching black spots on peonies. It is Mother Nature’s first line of attack in breaking down weakened flower tissue for recycling. No matter whether you want that flower bud or leaf – botrytis is the first wave of recycling. This article describes common and effective non-chemical controls.
Rose Problems
Powdery mildew. You’ve likely seen it as a light dusting of white on leaves that lead to twisting and deformed leaves. The tips of growing rose canes twirl and are deformed. Brown-eyed susan and lilac leaves are routinely dusted with white before the season is over.
Black spot on your roses Here’s the scoop on how to control this problem using natural methods.
Another rose problem, more commonly seen on the west coast is downy mildew A problem associated with cool humidity, this is rarely a problem on the east coast.
Questions and Answers
My variegated plant leaves revert to green? Is this a disease?
Blackened leaves may signal Fireblight on this Asian Pear.
The leaves are falling from my crab apple and there are hard nodules on the bark?
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Click below to see questions from other visitors to this page...
coneflower flowers turning black
i was wondering if the flowers r susposed to turn black after awhile and if u are susposed to cut them off?
Doug says - yes, the flowers fade and then ...
John Cabot Rose and Yellowing Leaves I have a John Cabot rose bush and the leaves are turning yellow. I use a 20-20-20 fertilizer and water 2 - 3 times a week. Is there anything I can do to ...
Rhubarb and powdery mildew Is rhubarb affected by powderly mildew? I have leaves turning yellow, then dying...I haven't seen the telltale powdering on the leave tops, just the yellowing ...
deformed peppers I am in Miami Fl. and am growing bell peppers in containers. I am having a problem with bugs or a disease. The plants were beautiful and now the new growth ...
Locust Tree Leafing Out Irregularly I live in Ottawa and last year moved to a house that has a locust tree in the front yard. It is probably 6 years old and in the spring I noticed that one ...
mold mildew I have a constant mold/mildew problem in my garden. I live in a very dry climate and use a soaker hose to water. the mold affects my echinacea, columbine,...
americana agave I live in az and my plant just fell ove rit was about 4 yrs old. I called the nursery and they said it probably had worms. I went to dig it up and the ...
Chinese flowering dogwood leaf problem
Hi Doug,
I planted a Chinese flowering dogwood last fall in my front lawn. We enjoyed about 10 to 15 blooms this spring/summer, but now the tree is not ...
hibiscus buds falling off
my hybrid double bud yellow hibiscus bloom keeps falling off before bloom is open.
Doug says that dropping blossoms is usually a stress symptom. In ...
Ficus Benjamina Problem
I have three ficus in indoor atrium, 30
years old. One looked bad so sprayed
with soapy water twice. No success.
Female cat may have relieved herself ...
John Cabot rose bush My rose bush has had black spot all summer and i can't seem to get rid of it. If I cut it all the way back during the fall and start treating it next summer ...
Lilac leaves curling on new "Miss Kim" lilac I have 2 new lilac plants with leaves that have recently curled. I don't want to lose these plants. Do they have a virus and if they do, how do I treat ...
dying tomato plants this is the third year. My tomato plants do so good till the weather turns hot then plants start turning yellow then brown at the bottom of the plant working ...
blackened Peonies The Peonies looked beautiful when they were in bloom. The leaves had black spots now most of the plant looks dead. Is there any hope for this plant or ...
raspberries wilting I have a raspberry patch in a garden box 10 x 4'. I transplanted neighbors starts 2 years ago. Last summer I noticed tall seemingly good condition canes ...
split and cracking tomatoes
im growing cherry tomatoes and they grow very well, problem is right as they start to turn red they start to split, and i dont know why,,,,, pls help
tomatoe ...
Leaf Spot
I have three tub fuschia's that appear to have black spots on then. they are Princess Dollar and Marinka.
The new shoots do not appear to have been ...
black spots on green tomatoes
My green tomatoes now have tiny black spots on them. This does not look like blossom end rot. What could it be?
Doug says that black spots on tomatoes ...
Allardii Lavender Wilting and Dying
,
I live in the south of Italy and I have an Allardii Lavender. I really don't know how, but 4 days ago its leaves got flebby. Some leaves have some brown ...
tomatoe vine wilt/blight??? some of my tomatoe vines are just starting to wilt and die, starting at the end of the tomatoe stems and comtinueing back. i have pinched off the wilted/...
Thin and Dwarfed Plants My father planted his tomato plants on May 20. The plants are very thin and most of the leaves at the top are very curly but very green. Most of the plants ...
Fungus on rose bush Our rose bush has some black powdery stuff on one of the stems and a lot of the leaves are turning yellow. The black stuff looks like it came from a white ...
cosmos with white on leaves Last year I planted cosmos and, for the first time, had bushy, gorgeous growing plants. Great cut flowers! (I hadn't planted Cosmos in years!) I usually ...
impatiens wilting and dying after transplanting I grow my own impatiens from seed--for 15 years. I start them in the house and then put them in four packs in my greenhouse. I've never had trouble with ...
lynchnis (sp) problems I have a maltese cross from last year and a rose campion that I planted this spring - they both have the same problem: Some of the stems are turning brown ...
Black Eyed Susan My Blacked Eyed Susan have brown spots on the lower leaves. This is the second year this has happened. It does not affect the flowers but is unsightly....
white powedery substance on house plant leaves
what is the white powdery substance that forms on the leaves of house plants?
Doug says - check out this page on powdery mildew
powdery mildew on my akebia vine on leaves and growing shoots Every year after a vigorous start and after flowering my akebia vine gets attacked by mildew and leaves drop off. I have tried spraying sachets of fungistat ...
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