Coolidge Pineapple Guava pest - Ask Extension
Can you offer help with my Coolige Pineapple Guava?
In June of 2021, we planted a Coolidge Pineapple Guava in our yard. The area gets full sun and g...
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Coolidge Pineapple Guava pest #820026
Asked February 09, 2023, 11:57 AM EST
Can you offer help with my Coolige Pineapple Guava?
In June of 2021, we planted a Coolidge Pineapple Guava in our yard. The area gets full sun and good drainage. For the first year, the guava seemed to settle into the spot and thrive. In the spring of 2022, however, I noticed small insects eating the leaves and leaving trails along the underside of the leaves. The insect is very, very tiny and seems to be black. I also noticed some webbing between some branches, but very little webbing. Both new growth and older leaves were damaged. I sprayed with Neem Oil but even with repeat spraying the insects persisted. It appeared that some branches of the older branches were dying.
With spring coming, I want to tackle this problem early in the season. Attached are photos taken last week showing the damaged leaves. The photos of the bush were taken just after we planted it in 2021. The Guava replaced a Photinia that had been showing signs of black spot. We waited 8 months before planting the guava, but I wonder if the soil might have been infected by something from the Photinia and we should have waited longer.
Thank you
Elaine Offield
Washington County Oregon
Expert Response
Thank you for your question and patience, Elaine. Since guavas are not a common nor researched crop species in Oregon, OSU doesn't have any information on either diseases nor insects for them. However, Penn State has a resource on both of these pests that may be helpful: https://plantvillage.psu.edu/topics/guava/infos
Without a photo of the insect, and with a couple of prospects listed, thrips being pests whose damage is done on leaves, the only other suggestion would be to submit the damaged leaves and insects to the OSU Plant Disease Diagnostic Clinic: https://bpp.oregonstate.edu/plant-clinic/submit-sample/how-submit-plant-materials From your description, I don't know whether insects are the actual pest, or whether they are feeding on diseased plant tissue caused by, for example, algal leaf spot. I am sorry I can't help further. Good luck!
Without a photo of the insect, and with a couple of prospects listed, thrips being pests whose damage is done on leaves, the only other suggestion would be to submit the damaged leaves and insects to the OSU Plant Disease Diagnostic Clinic: https://bpp.oregonstate.edu/plant-clinic/submit-sample/how-submit-plant-materials From your description, I don't know whether insects are the actual pest, or whether they are feeding on diseased plant tissue caused by, for example, algal leaf spot. I am sorry I can't help further. Good luck!
Thank you. I appreciate this information.
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