For questions about plant diseases.

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10
votes
3answers
772 views

What else besides calcium deficiency could be causing tomato blossom end rot?

I've been using "Tomato Maker" (4-2-6) fertilizer, which supposedly has enough calcium to prevent blossom end rot, but I'm still getting blossom end rot on my super marzano tomatoes (no BER problems ...
11
votes
2answers
3k views

Why have my tomato leaves started yellowing at the base?

One of my tomato plants (Better Boys if that matters) has a few leaves that have started yellowing on the lower branches. Not sure if they aren't getting enough water, or if they are diseased or what. ...
7
votes
2answers
536 views

What is the problem/disease that causes bobbly peach tree leaves?

What is the likely cause of the bobbly forms on the leaves of a peach tree? Does it matter or is it just some natural anomaly that doesn't affect the tree's health? If is it a concern how can it be ...
15
votes
5answers
7k views

What are these hard white/brown spots growing on my houseplant?

A little more then an year ago I got six palm trees (two vases). It was the Californian equivalent of an Areca palm (the guy in the nursery suggested this one after I asked for an Areca for its air ...
2
votes
1answer
51 views

How to heal this needled plant?

This little guy is suffering and I'm not sure how to help him out. Any ideas?
11
votes
1answer
6k views

What is happening to my chilli plant? How can I help it?

Some white spots appeared recently on my Twilight chilli plant (indoors), on some leaves brown spots start appearing in the middle. First I thought - aphids, but it doesn't quite look like insects. Or ...
9
votes
2answers
524 views

What is this brown, shell-like thing growing on the stalk of my avocado plant?

Could you please help identifying this brown shell-like thing growing on the stalk of my avocado plant? There are several of these. It looks like a little shell (with the appearance of a ...
8
votes
2answers
1k views

How do I treat rhubarb rust?

I have a small rhubarb plant and one of the stems has gotten some rust on it. What should I do? (there are only 3 small stems on the plant)
7
votes
1answer
1k views

Is something wrong with my zucchini plant?

I have three large zucchini plants in my garden, and all three have been producing nice fruits for a few weeks. The last couple days, one of them has started to turn yellow and sickly: I've never ...
6
votes
2answers
7k views

Why does my blueberry bush have brown/scorched leaves?

I recently purchased a dwarf Northsky blueberry bush from a mail order company. When I recieved it, roughly 15-20% of its leaves had the appearance of being burned or scorched; the bad leaves were ...
5
votes
1answer
2k views

What is causing the bark on my crabapple to crack and peel off?

I have a flowering crabapple in my yard whose bark has several large areas where it cracks and curls away from the wood underneath: Hover over any image for description / click for full size I ...
3
votes
1answer
125 views

Why are the lower leaves of my tropical Guava yellowing and dropping?

I had a Century Guava (世紀芭樂) shipped over from Taiwan to zone 9 California. It is nearly 6 feet tall. I planted it in the biggest container that IKEA sold, 20 inches wide, 2 feet deep. I drilled many ...
3
votes
1answer
450 views

What is this disease on my Basil?

I've planted Basil (from a pot) outside and it's been very wet in the last few weeks. The plant has now got these grey spots on it. What is wrong with it?