Yellowing leaves at start of flowering

[Billy25]

Check this. Remember I said not heavy!

https://www.softsecrets.com/gb/news/national/nitrogen-and-cannabis/

Very interesting article; thanks for the link. I try to be "scientific", and change only one variable at a time till it becomes clear that one change has had an effect or not. Still not convinced that the damage is spider mites, as the black specs don't look like any of the pictures I've seen even under the loupe. But, the spinosad won't hurt anything, and if it is bugs and I just can't see them, it could help prevent a disaster.
If there is no effect, I'll add a touch of N, a bit at a time and try that route. In the meantime, the buds appear to be continuing to develop, and that's the main thing.
This is only my second grow. The first was not successful, as the 3 autoflower strains I planted only produced a few grams each. Thank goodness the 4th plant, a White Widow Fast, grew a lot better and produced just over an ounce!

 

[Kushash]

Very interesting article; thanks for the link. I try to be "scientific", and change only one variable at a time till it becomes clear that one change has had an effect or not. Still not convinced that the damage is spider mites, as the black specs don't look like any of the pictures I've seen even under the loupe. But, the spinosad won't hurt anything, and if it is bugs and I just can't see them, it could help prevent a disaster.
If there is no effect, I'll add a touch of N, a bit at a time and try that route. In the meantime, the buds appear to be continuing to develop, and that's the main thing.
This is only my second grow. The first was not successful, as the 3 autoflower strains I planted only produced a few grams each. Thank goodness the 4th plant, a White Widow Fast, grew a lot better and produced just over an ounce!

Do the black specs look like this?

 

[rob333]

Plants are in soil (cheap Kellog's Patio-Plus). In cloth grow bags, 10 gal..
Feed water is around 900 ppm
I feed them with each watering.

Spots are a lighter yellow, not at all shiny.

they need to be on round 1200-1600ppm round 3 weeks of flower theres your issues

 

[rob333]

Forget the heavy nitrogen! Forget the heavy nitrogen! Forget the heavy nitrogen!

you and your godamn nitrogen and calcium is that your answer for every goddamn thread each thread you post in is either calcium or nitrogen issues stop spreading your shit lololol just joking

 

[hotrodharley]

you and your godamn nitrogen and calcium is that your answer for every goddamn thread each thread you post in is either calcium or nitrogen issues stop spreading your shit lololol just joking

I'm trying to dissuade people from being heavy on nitrogen in flower. By using cal mag it supplies nitrogen. The nutes have nitrogen in the micros. In my own hard learned experience nitrogen from about week 4 of flower needs to be cut back. If not nute burn or unwanted late flower growing etc.

 

[hotrodharley]

In fact I have basically switched to Lucas formula after one last high nitrogen feed early in flower. Only one strain showed any nitrogen deficiency in mid-flower and a touch of nitrogen solves that.

 

[rob333]

Cal mag has nitrogen and is needed in flower. Any micros have nitrogen. Don't cause it to go weird or start foxtailing.

I'm trying to dissuade people from being heavy on nitrogen in flower. By using cal mag it supplies nitrogen. The nutes have nitrogen in the micros. In my own hard learned experience nitrogen from about week 4 of flower needs to be cut back. If not nute burn or unwanted late flower growing etc.

Cal mag is used also Epsom salts to 'cure' Mg Def. but this Mg def. is an old tree/plant issue unless you use RO water, which strips out the calcium, thru the RO process anyways, and so is best to add every time you feed, just a pinch of cal mag to your feeding at each feed, but if you don't use RO water and are over calcifying your water you will be in shit street

 

[rob333]

I'm trying to dissuade people from being heavy on nitrogen in flower. By using cal mag it supplies nitrogen. The nutes have nitrogen in the micros. In my own hard learned experience nitrogen from about week 4 of flower needs to be cut back. If not nute burn or unwanted late flower growing etc.

Really please explain to the membership why (N) is required in Bud...? cause in my 45+ years it aint used in the flowering process at all, (N) is used by the plant and the grower, to create body,
volume en masse, or in this case cellulose stuff like leaves and branches

 

[whitebb2727]

Forget the heavy nitrogen! Forget the heavy nitrogen! Forget the heavy nitrogen!

No one side heavy nitrogen.

A balanced feed won't hurt them a bit or cuase foxtailing.

 

[whitebb2727]

Check this. Remember I said not heavy!

https://www.softsecrets.com/gb/news/national/nitrogen-and-cannabis/

That very article says N is needed to the end and that a lot of.new grower cut N out too early.

 

[hotrodharley]

That very article says N is needed to the end and that a lot of.new grower cut N out too early.

Exactly. People see yellow though and freak late. I just advised no heavy nitrogen.

 

[Billy25]

Do the black specs look like this?
View attachment 4232703

Yes! Just like that. Insect droppings? I did finally see just one little bug - beige short-legged spider-looking thing.

 

[Kushash]

Yes! Just like that. Insect droppings? I did finally see just one little bug - beige short-legged spider-looking thing.

Yes it is poop. Your pest is likely thrips.
Thrips are a problem but not nearly as bad as spider mites.
Here is a picture of thrips in different stages of growth.

 

[whitebb2727]

Yes! Just like that. Insect droppings? I did finally see just one little bug - beige short-legged spider-looking thing.

That is spider mites. Get the spinosad immediately.

Edit. How big is the spider looking thing? About the size of pin head will be a mite.

 

[Kushash]

That is spider mites. Get the spinosad immediately.

Edit. How big is the spider looking thing? About the size of pin head will be a mite.

Do spider mites leave black poop spots also?

 

[whitebb2727]

Do spider mites leave black poop spots also?

Yes. I've seen black spots with mites.

Either way, thrips or mites the spinosad will work.

 

[Billy25]

That is spider mites. Get the spinosad immediately.

Edit. How big is the spider looking thing? About the size of pin head will be a mite.

Spinosad applied yesterday. As soon as you mentioned it, I got some and sprayed the plants. Roughly head-of-pin size, no bigger. May be my eyesight, but I need a magnifier to see them. The poop I can spot due to the color contrast.