Question
My avocado pit, just recently planted in soil is now about 13 inches high - or was until today when I cut it back for the second time, this time to six inches. It appears to be healthy, but I noticed for the first time that the lower, older part of the stem (the part that is left from where I cut it back the first time) is covered with a light-colored grayish/whitish film that seems to rub off easily, but comes right back. Do you know what that is and what it portends for my plant? I'll appreciate your expertise in this matter. I guess it could be just normal for an avocado plant.

Thanks so much. I'll be eagerly awaiting your answer.

Ruth Canon
Dallas, Texas

Answer
Hi Ruth,

If the substance is film-like and evenly distributed on the stem - not in patches - then it is just normal oxidation that occurs on some plants. Ficus and Schefflera leaves also develop this film. It is harmless. Sometimes wiping it off with a dilute mixture of mineral oil and water will retard its development.

Please let me know if this is unclear or if you have any additional questions.

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