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need advice on Zinnia

#1 User is offline   greenplot 

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Posted 18 July 2015 - 02:36 PM

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new to this forum, appreciate any advice.http://www.greenculturesg.com/forum/public/style_emoticons/default/smile.gif


I have been planting Zinnia flowers. but no matter what I do, always notice brown patches on leaves.
over time, it gets worse.


what is the cause and what should be done?
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#2 User is offline   digitalgate 

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Posted 18 July 2015 - 04:30 PM

The brown ring on your zinnia is caused by leaf miner insect ,if you can also feel the worm feeding within the leaf structure then u can kill it by pressing that part of the leaf . The small brown dot can be causes by fungal or biting insect after it puncture it leaf . So nothing u can do for the time being . But u know zinnia is a annual ? It is suppose to wilt after it finish flowering cycle .
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#3 User is offline   greenplot 

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Posted 18 July 2015 - 07:24 PM

Thanks for your reply.

Not able to see any worm or insect on the leaves, at least not visible.
Should I spray malathion or fungiclde to get rid insect/fungus?

The brown patches and spots are getting more.

I'm a novice gardener, so was not even aware of annuals & perennials until I googled!
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#4 User is offline   digitalgate 

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Posted 19 July 2015 - 05:18 PM

you can use neem oil. Other stuff might not work too well as this is a secondary infection.
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#5 User is offline   greenplot 

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Posted 20 July 2015 - 11:02 AM

thanks, will try to get hold of neem oil. understand that it is not so available.

a picture of the zinnia planted a few months back.
very sorry state, not exactly sure what caused problem. hopefully future ones will be better.

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#6 User is offline   Wisteria 

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Posted 20 July 2015 - 02:30 PM

The brown patches may be due to sun burn or chemical burn.

When water lands on the leaves (due to rain or your watering) and then the wet leaves are exposed to hot sun, the parts of the leaf that have water on them will get scorched by the sun and turn brown. If someone spills chemical (liquid form) or chemical fertiliser on the plant, the leaves will display similar symptoms.
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