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Top Questions About Grapefruit Trees

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Questions About Grapefruit Trees

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  • Answered by
    Nikki on
    June 7, 2012
    Certified Expert
    A.

    I would have your soil tested. Yellowing of the leaves is typically either an iron or nitrogen deficiency. When was the last time you fertilized the tree? It may need nutrients. If you have not been fertilizing, start doing so and, regardless, have the soil tested to see if you have any nutrient deficiencies that need to be corrected. Here is more information on fertilizing citrus trees: https://www.gardeningknowhow.com/edible/fruits/citrus/fertilizing-citrus-trees-best-practices-for-citrus-fertilizing.htm

    In addition, it could be a watering issue, possibly not enough. Citrus plants require lots of water. This article should help: https://www.gardeningknowhow.com/edible/fruits/citrus/tip-on-water-requirements-for-citrus-trees.htm

    This article will have some other reasons for yellowing leaves: https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm

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  • Answered by
    Heather on
    June 20, 2012
    Certified Expert
    A.

    I would water more. Newly planted trees need a significant amount of water to establish. Try watering for longer periods and perhaps even twice a day if your soil is on the sandy side. Make sure to water deeply when you water to make sure the water gets deep in the soil to all the roots.

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  • Answered by
    grzegorz61 on
    June 27, 2012
    A.

    Thanks Heather,
    Now I think that water and hot weather in Glendale AZ is the issue.
    I think that the tree has enough water but it was still too hot air so I build some shadowing net cover over the this young crown. It is doing much better since.
    Also I gave some citrus fertilizer to boost it. Well I have two factors now, but I think that the shadowing net is the best solution.
    I water three times a week with deep watering of some 10 gal. with the drip.

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  • Answered by
    Nikki on
    July 5, 2012
    Certified Expert
  • Answered by
    Heather on
    July 16, 2012
    Certified Expert
    A.

    The algae looking spots are lichen. They are more a symptom of what is wrong with the tree, rather than the cause. Lichen tends to be attracted to trees that are unhealthy.

    As for what could be causing your tree to be unhealthy, there are many, many reasons. It is very hard to diagnose trees without being able to examine them. I would strongly recommend that you bring a tree specialist in to look at it or contact your local extension service and see if they can look at the tree.

    If this is not possible, then you can try to treat the tree with a fungicide and a pesticide. These will take care of a significant amount of the problems the tree may have. I recommend neem oil, as it is both a fungucide and a pesticide and is systemic, so will get into the tree itself to fight off what may be attacking it. Reapply it every 1-2 weeks.

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  • Answered by
    Nikki on
    July 16, 2012
    Certified Expert
    A.

    While citrus trees need lots of water, you may be overdoing it a bit. This article should help: https://www.gardeningknowhow.com/edible/fruits/citrus/tip-on-water-requirements-for-citrus-trees.htm

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  • Answered by
    Nikki on
    July 28, 2012
    Certified Expert
    A.

    The trees will shed some fruit if it feels it is unable to support all the fruit that it has, so some loss is normal. But, if you feel the tree is dropping a lot of fruit, you could either have a pollination issue or the tree may be lacking water or nutrients and is shedding fruit to try to preserve itself. Make sure you are attracting pollinators and increase water to the tree when it first starts developing fruit.

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