Dangermouse01 thanks so much for your quick answer. I was wrong about the issue so I really appreciate your letting me know what is going on. I hand't even noticed the scale... I need new glasses :(. That explains the ants we saw on the tree, but I put granules around the trunk and they are no more. I just read online that if I take care of the scale then the sooty mold will resolve itself so I will go to Home Depot and get neem oil this week. I hope that the fruit doesn't have larva in it (gross!), but I will check the ones I got today. I might try pruning it a bit to let in more light, but I have to read up on how to do that before I try. Thanks again for the help :)

I have the same problem with some of my guava plants. It looks like its Algal Leaf Spot. I sprayed mine with Horticultural Oil to control mites and other pests and Liquid Copper Fungicide to control the fungus causing the ALS. It seemed to help a lot along with proper nutrition and irrigation, removing infected leaves and twigs and disposing them properly, and thinning. Good luck.

I've found Guava are prone to that. You just need to keep an eye on it.

Here is a pic of severe Algal Leaf Spot of one of my guavas. I removed the infected leaves and branches. I will monitor if the new leaves will come out with out the disease. If not I may have to dispose it to protect the rest ot the guavas.

It could be a location problem. Is it in a shadier/sheltered/damper spot than the others?

C Wes I hope your guava gets better with the spray. Let me know how it goes.

Tropicbreezent

Yes, indeed it is in a shadier area, so I moved it to an area where it will get the sun first. I am hopeful something positive will happen.

Flofli

Thank you Flofli. I will share to you all what happens next. Right now the tree looks defoliated but I see some new leaves are already coming out. But we have to remember that Liquid Copper Fungicide is preventive not curative so it'll do best if used early before bud break. Live and learn.

Flofli

the white fuzzy things look like mealybugs.

look underneath leaves for them. especially, under new growth.

too much nitrogen can cause the cells to become elongated and not harden off properly on new growth.

i give my guavas compost and fish emulsion. they seem to love organics, not so much with chemicals.

It seems sooty mold, typical of Citrus..but i'm not sure..

This is an update of my guava that had the algal leaf spot after removal of infected leaves and two treatments using liquid copper fungicide.

There was scale under the leaves and I was finally able to spray the tree with horticultural oil. Now I have to do something about the guava flies. It hasn't produced any new guavas in about a week, but it has a lot of baby guavas and new foliage growth so I am hopeful :)

C Wes I am so glad that your tree is doing better :). You can definitely see the improvement in the pictures! I hope it continues to thrive.

Thanks Flofli. It is doing so well that now it has started to put out buds that I hope will turn into fruit in 4 months.

Now it looks healthy...i hope it will bear lot of frutis :)

I hope so, but for now it has only one fruit.

I saw some scale on my pink Guava. First real pest problem for me on a tropical fruit tree. I washed them off. I also see today,something is eating the soft new leaves. I dont find a thing.

Large fruited Guava's might not be easy as the small types.

On the contrary, I find it extremely easy to take care of guava. Mine is the Thai or some call them Vietnamese guava which has a very large crunchy white fruit with few seeds. I started off with 8 seedlings and now have almost 30 plants in varying size. Three year old healthy plants will bear fruit every year with not much care aside from watering, fertilizing, warding off pests/diseases and protecting from cold weather. So far, compared to other tropical fruit trees like mangoes, soursop, lychee, sugar apple, jackfruit, rambutan, banana I find guava as superior in terms of return of effort, money and time spent.

In California,land of no summer rains? I think hosing down the plant when you water is a good idea. Not important with the smaller thicker leafed Guava's.