Walnut Tree – Worms

Question

I live in South Africa, and moved into a house with a walnut tree. Year 1, the walnut tree produced walnuts. As this was my first year with the tree, I didnt pick too many nuts, and the nuts I did pick I gave away – so didnt take note of the quality nut produced. Year 2, I was surprised the tree produced nuts again, as I had read it would not do so every year. The first haul I picked just under 300 nuts. When opening the nuts, some of them had worms in them. Generally 1 worm in the nut. Some of the worms were bright red. Some were white. What kind of worms are they? What can I do for the tree so that next year the nuts are worm free?

Answer 1

These articles should help:

https://www.gardeningknowhow.com/edible/nut-trees/walnut/walnut-tree-harvesting.htm
https://www2.ipm.ucanr.edu/agriculture/walnut/navel-orangeworm/
http://www.uky.edu/Ag/Entomology/treepestguide/walnut.html
https://extension.entm.purdue.edu/publications/E-33.pdf
http://ipm.ucanr.edu/PMG/PESTNOTES/pn7430.html