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I don't have an answer but I would love to have a coffee tree. Do they grow in Central Texas?

It is advisable to pre-germinate the seeds. First soak the coffee seeds in water for 24 hours, then sow the seeds in damp sand or wet vermiculite. As for germination, this can take anywhere from 2-3 months.

Assuming your coffee plant is indoors, I would think that the problem could be lack of humidity. The symptoms you describe are commonly associated with the dry heated air found in most homes. If it isn't lack of humidity, the problem ccould be rust.. If it is rust, ground cinnamon, neem oil or an all-purposr fungicide should work.

These articles should help:
https://www.gardeningknowhow.com/houseplants/coffee/growing-coffee-plants-indoors.htm

The color is usually white.

For more information on growing coffee plants, please visit the following link:
https://www.gardeningknowhow.com/houseplants/coffee/growing-coffee-plants-indoors.htm

Coffee plants cannot take temperatures below freezing and will not do well in temperatures that stay consistently below 65 F. Therefore, you cannot leave the coffee plant outdoors during the winter. During the summer months you can set your coffee plant outside in a location with filtered sunlight. While the coffee plant is outdoors, the ideal night temperatures are lower to mid 60s with day temperatures at 70 degrees or higher. In terms of watering, you will want to keep the soil consistently moist, but never damp/soggy so you will water it when the soil is just about dry to the touch. The soil you pot your plant in should be rich, well-draining soil.

For more information on coffee plants, please visit the following link:
https://www.gardeningknowhow.com/houseplants/coffee/growing-coffee-plants-indoors.htm