Hola, buenas tardes, estoy terminando la 4 semana ...

Hello, good afternoon. I am finishing the 4th week of some feminized plants. But I am noticing that there are white spots. Here are some photos. Thank you. Hi, good afternoon, I see very fine black dots as well. looks like it could be parasite's or something like a virus. I don't know but I hope someone else finds the answers to the problem for you.

The appearance of white spots on cannabis leaves can be concerning, and it's important to correctly diagnose the cause to treat it effectively. Here are some potential causes and corresponding treatments for the white spots: Nutrient Deficiency: Flushing can sometimes leach essential nutrients from the growing medium. White spots might indicate a deficiency, possibly of calcium or magnesium. Treatment: After flushing, re-introduce a balanced nutrient solution that's appropriate for the flowering stage, ensuring it includes calcium and magnesium. Fungal Issues: Fungal growth like powdery mildew can also appear as white spots on leaves, especially in conditions with fluctuating humidity. Treatment: If it's a fungal issue, you'll need to use a fungicide. Ensure good air circulation in the grow area and try to stabilize the humidity levels. Pest Infestation: Certain pests, like spider mites, can leave tiny white spots on leaves where they feed. Treatment: Inspect the plants closely for pests. If pests are found, use an appropriate insecticide or natural pest control method. Water Quality or pH Fluctuations: The spots could be a reaction to sudden changes in pH or water quality. Even if the pH is correct, there might be issues with the water you're using. Treatment: Ensure the water quality is consistent. You might want to test your water source for any irregularities. Light Burn: Sometimes intense lighting can cause bleaching or white spots on the leaves. Treatment: Check your light distance and intensity. Make sure your plants are not too close to the light source. Physical Damage: If the spots appeared right after flushing, it's possible that physical handling or water pressure caused minor damage to the leaves. Treatment: Be gentle when handling plants and avoid direct water pressure on leaves. In dealing with this issue, consider these steps: Diagnosis: Carefully examine the plants to confirm the cause of the white spots. Look for patterns, additional symptoms, and consider all environmental factors. Adjustments: Make any necessary adjustments to your growing environment, nutrient schedule, and watering practices. Monitoring: After treating, monitor the plants closely for any changes or improvements.

I think this is just dust and you can rub it off. I‘m not 100% sure tho. To prevent some pests from entering you should clean your growspace

first photo looks like thrips = spinosad give great results against them

I'm thinking similar to the other 2 answers. I'd check for pests 1st, look under the leaves. If your grow space isn't clean there is a chance is fungus.

hmmm humidity is fine. so i cant see it being powdery mildew. though it is most likely some kind of fungus or bactirial infection. I would check the under side of leaves for pests but to be honest this one is quite hard with juist the pictures best of luck though buddy im sure youll sort it :)

Pests, look under side of leaf. Think its thrips I was using natural predators. Drogonfli co uk Page i was buying, find alternative in your country Put dots instead of space, platform has anti spam filters for www share