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What could have caused the damage in some of the leafs of this pothos? Fungus? Drought? Pest?

Factors:

  • It appeared suddenly, at the end of winter time, beginning of spring
  • It is an indoor plant, and the windows have been closed for several months, since it is winter.
  • It is not over a heating vent
  • It is not directly exposed to sunlight
  • It has not been treated with any chemical
  • There was a plant in the same room infested with white flies (removed now), but there are no signs of white flies in this plant.
  • There was a plant in the same room infested with fruit flies (removed now), but there are no signs of fruit flies in this plant.
  • Not all the leafs are affected, only 5% of them. And not even in the same stem.
  • A sister plant that lives besides this one has started to show the same damage (three leafs).
  • Notice the row of little holes in one of them.
  • I could not see any pest or eggs on the backside of the leafs, using a magnifier.

Thanks in advance!

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cockypup
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The leaf with the line of holes in it shows signs of mechanical damage as Escoce suggests.

The other damage is strongly suggestive of fungus/virus/bacteria brought on by over watering. Identification is suggested by:

  • sunken lesions
  • irregular areas of dead tissue surrounded by dying tissue surrounded by a thin line
  • no signs of insect eggs/frass/adults

Plants co exist with a multitude of other organisms in the soil and their tissues. When a stress is put on the plant like lower light and too much water these organisms can get out of hand and multiply to cause the damage you see.

Increase the light, decrease the amount of water and the plant will outgrow the problem. In the spring trimming the roots and re-potting with fresh soil may be helpful.

kevinskio
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I am going to take a stab at this one. I don't think this is pest induced, but rather the longer term effects of mechanical damage. A leaf getting folded, brushed up against too many times, or the slightest of breezes making the leave rub against something else. Being the end of winter, there hasn't been much new growth and this tropical plant has just been maintaining itself, and these leaves are now simply just too old and weak to push off the effects of having been handled in some way or fashion over the last several cold months.

Escoce
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I agree it may be mechanical damage, but it may well also be the leaf coming to the end of its life. Especially if there are only a few on the plant, and they look as though they are mature and not juvenile.