1
point
Wilting and discoloration of sunflower leaves

Sunflower    None Given

I have 3 sunflower plants that have been doing great, but I just noticed that all of my plants have brown edges on their leaves and that they've begun to wilt. It seems to have started with the bottom leaves, as the new ones have died and been unable to grow and the top leaves seem unaffected. I live in South Florida and recently it's been raining a lot more than when I first planted the sunflowers but I don't know if this is the problem. The soil I planted them in already had a fertilizer inside it, so I don't know what exactly is going on. The leaf discoloration and wilting seemed to have started with just one of my plants and spread to the other 2, but I'm not sure. Any information is welcome and appreciated


Posted by: Taylor Doorn (2 points) Taylor Doorn
Posted: April 4, 2016




Answers

0
points
It looks like verticillium wilt caused by fungus Verticllium dahliae. The main symptoms are lower leaves exhibit chlorosis and necrosis in between veins. The infected leaves wilt, dry out and eventually die. You will also notice blackening of stem near soil surface. The fungus is soil borne.

Very difficult to control at this stage. But in future use healthy, certified seeds. Also sterile the pots and soil before use.


Posted by: Dr. Ravishankar Narayana (11 points) Dr. Ravishankar Narayana
Posted: April 4, 2016




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