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1

Powdery mildew is worse where sunlight is limited, as is downy mildew. You said cramming plants can increase the risk, and you've had fans on to increase aeration. Humidity would affect it. Dry leaves may make it worse, strangely. The opposite seems to be true of downy mildew, about wet leaves. Here are some potential ideas that might help: Plant ...


2

Calcium deficiency. In addition to the answer about chlorosis being like anemia, that's really not as far off as it may sound since anemia is in essence a shortage of Iron. An iron deficiency can be the root cause of multiple nutrient deficiencies, even when those nutrients are in the soil and available to the plants. Iron is what allows a plant to absorb ...


2

None - the names Powdery Mildew and Downy Mildew refer specifically to the symptoms present on the plant. Both are caused by various fungi (meaning several different fungi can cause Downy Mildew, and the same for Powdery Mildew) and each variety of fungi is plant specific, meaning it prefers some plants and not others, so the mildew you see on one particular ...


2

It could be too much salt...is there a white coating on top of the soil? On the outside of the pot? Are you using tap water to irrigate? If so, repot this plant in fresh, sterilized potting soil. Water with distilled water. I've seen so many plants with leaves like this and all of them were in pots with salt-buildup. Send a few more pictures...get ...


2

Although I agree with Shule 100%, calcium is another deficiency that can cause brown leaves...I think yours is potassium deficient as well, but don't forget your calcium as well. It is perhaps the most under-noticed, yet one of the most important nutrients for your plants. Bone meal is one of the sources


4

It's possibly a potassium deficiency. Deficient plants sometimes have yellowing around the leaf edges. Potassium is important for fruit size (so I imagine it could be a factor in fruit development). Too much nitrogen can inhibit potassium. So, be careful about that. On the other hand, it could be a virus of some kind, but my guess is a nutrient imbalance. I ...


1

Have you tried NEEM? This is a pretty great insecticide. Don't worry about total kill. Scrubbing these guys off even with water will hurt the leaves...With vinegar? Alcohol? Ouch. The adults have a bit more protection, but your goal is to get the scale 'under control'...your watering technique is far more preferable to watering a little everyday. Make ...


6

If the tree is perfectly healthy and is growing well, the mycorrhiza is most likely beneficial. It might mean the soil was a bit dry - this seems to make the mycorrhiza more visible, but in the main, mycorrhiza is usually present and there is a beneficial synergistic exchange between the plant and the fungi.


4

Maybe it's mycorrhiza? If so... No.



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