Q.kumquat fruit
what is causing this on the kumquat fruit. No visible insects
Downtoearthdigs
Answered on May 16, 2017
This may be some type of an Anthracnose.
These links may help but I would suggest taking samples to your County Extension Office.
https://www.gardeningknowhow.com/extension-search/
http://ipm.ucanr.edu/PMG/C107/m107bpfruitdis.html
https://www.gardeningknowhow.com/edible/fruits/kumquat/growing-kumquat-trees.htm
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