Guava Leaves Turned To Yellow & Brown

Question

Hi I’ve two guava plants in a container. In Guava 1(more then 3 years): leaves turned to yellow with green veins even new leaves have same issue. Second old leaves curling downward. In Guava 2(more then 2 years): New leaves are curling with brown spots but old leaves is perfectly fine. Your expert advice is highly appreciated.

Answer 1

Unfortunately, without photos it will be hard to tell what is going on.

I suspect a pH issue, which can appear as a Magnesium deficiency, but this does not rule out infection, or an actual Magnesium deficiency.

The first place I would start would be soil testing. Testing nutrient contents and pH will give you a good idea of what the soil lacks, or if you need to adjust the pH. These articles will help:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm

That does not rule out the possibility of infection. A fungicide can be used for preventative measure:

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

This article will help you to the care of the tree:

https://www.gardeningknowhow.com/edible/fruits/guava/growing-guava-fruit-trees.htm