Q.kumquat tree
I have a white scaly substance on the branches and now white clouds that look like spider webs on the tree. How can I treat it? Thanks.
This could be Scale, Aphids and or Mealybug or combination of these pests.
Here are links with more information including how to treat the tree.
http://ucce.ucdavis.edu/files/datastore/530-15.pdf
https://www.gardeningknowhow.com/edible/fruits/citrus/controlling-citrus-scale.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/control-plant-scale.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/woolly-aphid-control.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/homemade-soap-spray.htm
https://www.gardeningknowhow.com/edible/fruits/kumquat/growing-kumquat-trees.htm