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Sorry. Unfortunately, we can only accept applications from within the US and Canada, at this time. You can, still, submit an application for consideration in the case that we change the rules for next year. We are sorry for any inconvenience that this causes.

It looks like seed pods to me. They are probably blowing in on the wind. Look up at the trees in your yard and neighbors' yards and see if you can see them. They also could be from shrubs, vines, annuals or perennials.

Your local extension office could probably identify them.

https://www.gardeningknowhow.com/garden-how-to/info/what-is-extension-service.htm

Your berm needs to be wide enough to accommodate the spreading roots of your hedge. You may have room for two or three small shrubs in front of the berm, as well. Or you could plant perennials in front of the berm.

Here is info on how to build a berm. This article doesn't suggest such a tall and wide berm as the noise reduction article.

https://www.gardeningknowhow.com/special/spaces/building-a-berm-how-do-i-make-a-berm.htm

No, it does not. The information is free. You do need to sign up with your email address to receive the newsletter, but you can search the website, http://www.gardeningknowhow.com, anytime for free information.

The closest plant to that name I found was Carapa guianensis, and not much about its problems. Premature fruit drop is usually caused by poor pollination, poor cultural practices, or pests and disease. Generally speaking, this article may help:

https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=30236

Unfortunately, the type of plant in question was not mentioned, and your photos did not come through. I am unable to offer much advice in this case, unfortunately.

If you would like to take a sample to your local extension service, then they may be able to help you further.

https://www.gardeningknowhow.com/extension-search