Black/grey tips on new growth help please

CrazyHazy

New Member
Hi
I have a large number of medical marijuana plants 2 weeks into bud and about 2 weeks ago the leaves started turning light green/yellow so we just assumed it was a nitrogen issue. We did get thrips and spider mites and have sprayed with azamax 2 times in 3 day intervals. Now most of the new growth is coming in with black tips and curling. It affects mostly the bottom 3 quarters of the plants. older leaves have been striped off as we do every 2 weeks the larger leaves that are there are still somewhat light in color and are curling down slightly. I can post pictures if that would help. Any ideas what the problem is over feeding? to strong Azamax?

Thanks Hazy
 
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