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Leaves slowly turning black


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Hi Guys, 

 

Would like to know if any of you know what this is or what i need to do to fix it.

Coco grow using Canna A B nutes PH 5.6-5.8

I noticed i had an infestation of spider mites, i sprayed the plants with white oil and repeated after 4 days. 6 Days after spraying with the oil the leaves have started turning black starting from the bottom of the plant slowly working its way up. 

What should i do?

PS. Only respond if you look at the photo and have dealt with a similar issue

Its not nute burn as the leaves are black not brown black 

post-49744-0-31185100-1365307612_thumb.jpg

post-49744-0-13679600-1365307619_thumb.jpg

Edited by Danatron1987
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How old is ya plant, looks like might be young for a heavy spray as thats what happened to my leaves on seedlings after a spray.....but id defently be rasing my ph to 5.8-6 as i believe 5.6 is too low for coco....

 

whats ya room setup plant numbers, lights, air temps n stuff all can have effects on plants......id be very worried having spider mites in early veg as will be a battle for the whole grow

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