Q.Pollination
Do citrus trees require bees to pollinate the flowers? Can we use other insects like ladybugs?
Most citrus are self-fertile, but some need cross pollination.
This is generally done by Bees or other insects.
If your growing citrus indoors, you will need to help pollinate your flowers.
Here are some links with more information.
https://www.gardeningknowhow.com/edible/fruits/lime/hand-pollinating-limes.htm
https://www.gardeningknowhow.com/edible/fruits/grapefruit/hand-pollinating-grapefruits.htm
https://www.gardeningknowhow.com/edible/fruits/citrus/citrus-blooming-season.htm
https://www.gardeningknowhow.com/edible/fruits/oranges/no-fruit-on-orange-trees.htm
https://www.gardeningknowhow.com/edible/fruits/fegen/self-pollinating-fruit.htm
https://www.gardeningknowhow.com/edible/fruits/oranges/
http://lee.ifas.ufl.edu/Hort/GardenPubsAZ/CitrusTree_Pollenizer_modified_Mongi.pdf