Nutrient problem

[Littlegee1988]

Got some nutrient problems going on here that I'm a little unsure of both plants seemed fine then within a matter of days have developed light spots turning necrotic, both plants are about 3 weeks old now, still in veg, grown in biobizz lightmix and have had one 1/2 strength feed with plant magic old-timer grow other than that just clean water which I've ph tested at 7. I'm thinking maybe magnesium or calcium? but this is only my second grow and that diagnosis is just what I've managed to deduce from info online any help would be hugely appreciated.

 

[Amadeus Forzin]

Any sign of bugs/pests? First and second pic look like bug damage to me, I've been wrong before tho. If not it could be calcium def but it normally starts with rusty looking spots

 

[Littlegee1988]

No obvious signs of pests I've been as thorough as possible in checking under all the leaves and there's no marks or eggs there, should I invest in some CalMag and try that?

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[Amadeus Forzin]

Bit of extra calmag won't hurt. Someone else should be along soon with another perspective

 

[W1zard]

Looks like wat was happening to my plants though mine to a far worse degree. turns out was cal mag deficiency, easily sorted

Heres a link to my post on the forums, i'd received a wealth of information.. might be worth checking out

Help ! - Spots on leaves

 

[Littlegee1988]

It does look very similar I'm going to order some calmag after I have a look at that link and thankyou both really appreciate the help

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[W1zard]

You're welcome. Before u do order call mag ha check that link. Tead seems an experienced grower suggests Epsom salts for mag and milk for calcium. Might save u a penny or two

He's listed measurements though can't remember off hand

All the best n good luck

 

[Jedthedog]

I would recommend that you have cal mag and SNS SNS-217™ Spider Mite Control RTU | Sierra Natural Science on hand all the time

 

[Major PITA]

I agree - the first picture looks like spider mite damage more than a nutrient problem.
Check the under side of the leaf with good magnification (30 - 60X).

 

[Littlegee1988]

Had a good look with magnification and can't see any mites, seems to be the big older fan leaves that are worst effected

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