Black or rusty spots Pics

seeds started on 9.02.10 (Paper towel method). Hempy bucket 1gal. 100% perlite

GH nutes, about 200w worth of CFL's

history

Seeds opened up within 24 hours and plant grew nicely from beginning with little to no problems. At around 6 leaves these black spots started appearing. The spots started on the bottom 2 leaves and have been working upward since. Plant seems to still be growing though.

did not feed the plants anything until 9.28.10 plants were around 3 weeks old before first feeding.

first feeding was was 25% amount of recommended nutes.


Please help.

the last 2 pics are of another plant growing right next to the other. All the same growing conditions and times for both.

what is your soils ph, and what ph water are u giving them? if its above 7 it may be a magnesium def... can u post pics?

There is no soil it is 100% perlite

Have not been testing Ph (do not have all the equipment to do so yet)

started out using distilled store bought water. then used tap water (las vegas tapwater) for a week or 2 but am now back to using distilled.


was high (blue dynamite) when originally posted. forgot to add pics!

yea that looks like a mg deficiency.... try adding a tablespoon of epsom salt/ gal when watering, and u could also try foliar feeding them so they get the rest of their nutes while u use epsom salt so they get their nitrogen

yea sry i must not have seen that... thats pretty cool... they grew that well out of that perlite with just straight distilled water?

yea sry i must not have seen that... thats pretty cool... they grew that well out of that perlite with just straight distilled water?
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well I used miracle grow perlite and the bag says enhanced with nutrients, so I suppose they have been fed somewhat.

Yes just perlite and distilled arrowhead water. (arrowhead is the name brand).


I will try using some epsolm salt .



ANY IDEAS ON IDENTIFYING THE STRAIN?



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