Yellow dots and small black flys

[matt6320]

Problem: as seen in pics, yellow dots. There are also small black flys living in the soil.
-Medium/grow method: soil. Cant remember the name though.
-Feed and supplements: biobizz 1 ml grow, 2 ml bloom and 1ml top max per 1L water.
-Water: not phing water anymore. I leave it to stand for 24 hours before watering.
-Strain and age: strain uknown. 3 weeks into flowering. Roughly 80 days from seed.
-Climate: day 24 degrees and night is 19
- Light used: mars hydro ts1000

 

[Bob's Auto's]

Hey there,

Those black flies are most likely Fungus Gnats, but since we don't have a picture I can't say with certainty. If it's Fungus Gnats, the flies them self don't do anything to the plants except reproduce at a stagering rate.
It's the larvae of the gnats which you should be concerned about. These feast on the roots which results in wilting, the spots in your picture are most likely something else, but I'm not that great myself in deficiency recognition.
If it's fungus gnats then you should see small clear (with a black spot on their head) larvae when you disrupt the top inch of your soil. Look very closely because the larvae are very small...

To eradicate them you can go one of three ways...

1. Dry out the soil, this will kill the larvae and prevents the flies to lay eggs. Then sprinkle a fine layer of cinnamon or diatomaceous earth on top of your soil. And water your plants through the bottom. ie, A container in which you dunk the pots or if it's to big a tray beneath the pot which you fill with water.
2. Use nematodes, but this works best if you use no chemical fertilizers.
3. Use a pesticide which contains Pyrethrum, which is a "natural" (always have to laugh when people say that biological is better, because there are more deadly substances found in nature then made by men...) chemical derived from a chrysanthemum ( a good read ). This has to be done two times because it will not kill the eggs. So after 5 days you have to reapply. Note: This will kill all living beings in the soil!

Regards,

Bob

 

[Mañ'O'Green]

Mosquito Bits or Dunks are a biological control. A yellow sticky trap will bring the numbers down.

 

[matt6320]

Hey there,

Those black flies are most likely Fungus Gnats, but since we don't have a picture I can't say with certainty. If it's Fungus Gnats, the flies them self don't do anything to the plants except reproduce at a stagering rate.
It's the larvae of the gnats which you should be concerned about. These feast on the roots which results in wilting, the spots in your picture are most likely something else, but I'm not that great myself in deficiency recognition.
If it's fungus gnats then you should see small clear (with a black spot on their head) larvae when you disrupt the top inch of your soil. Look very closely because the larvae are very small...

To eradicate them you can go one of three ways...

1. Dry out the soil, this will kill the larvae and prevents the flies to lay eggs. Then sprinkle a fine layer of cinnamon or diatomaceous earth on top of your soil. And water your plants through the bottom. ie, A container in which you dunk the pots or if it's to big a tray beneath the pot which you fill with water.
2. Use nematodes, but this works best if you use no chemical fertilizers.
3. Use a pesticide which contains Pyrethrum, which is a "natural" (always have to laugh when people say that biological is better, because there are more deadly substances found in nature then made by men...) chemical derived from a chrysanthemum ( a good read ). This has to be done two times because it will not kill the eggs. So after 5 days you have to reapply. Note: This will kill all living beings in the soil!

Regards,

Bob

Thanks mate. I've ordered some nematodes. I've always watered my plant, then waited until it was dry atleast an inch down. I usually test the soil with my finger to see if it needs watering so I'm surprised I have gnats really. Hopefully no long term damage is done before the nematodrs arrive!

As for the yellow dots, soea anyone have any idea?