The leaves on our two variegated holly bushes look very similar to this. The bottom third of the bushes are healthy, but the leaves on the top two-thirds look just like this. Some of the leaves are completely brown. Do you know what it is and if/how it can be treated? Thank you.
This is Tar Spot on a Holly leaf.
Here is more information about this fungus.
https://www.gardeningknowhow.com/ornamental/shrubs/holly/diseases-of-holly-bushes-pests-and-diseases-damaging-holly-bushes.htm
https://www.gardeningknowhow.com/ornamental/shrubs/holly/holly-problems-holly-leaf-spot-or-holly-tar-spot.htm
My holly tree was frost bitten. All of the leaves are brown and dry. How I can save the tree?
I think in your case I would take a wait and see approach. If the branches are still green and pliable I don't think pruning is in order just yet as it may still regrow leaves. Some fertilizer may help speed the process along.
https://www.gardeningknowhow.com/ornamental/shrubs/holly/fertilizing-holly-bushes.htm
How close should the male and female be planted?
GardeningKnowHow.com recommends that the male and female plants be within 200 yards of each other: https://www.gardeningknowhow.com/ornamental/shrubs/holly/holly-bush-no-berries.htm
I have a 20 yr old Holly Bush in front of my house. Starting last fall I noticed leaves turning yellow/brown. I pruned off all the discolored leaves, but they're back. The bush gets a lot of sun, although it's on the north facing side and is about 15' from the road. What should I do?
Yellow leaves on Holly can be watering issues, poor drainage and what I believe your shrub is suffering from is Iron Chlorosis.
A soil test is a great place to start, and you local County Extension Office can help you with this.
Here is a link to locate your closest office.
https://www.gardeningknowhow.com/extension-search
This article will provide more information.
https://www.gardeningknowhow.com/ornamental/shrubs/holly/holly-yellow-leaves.htm
How do you determine the difference between male and female bushes?
Here is a link that will help you.
Our large holly tree has yellowing leaves. Is there a remedy?
Here is an article that will help you which discusses how to fix yellow leaves on holly trees:
https://www.gardeningknowhow.com/ornamental/shrubs/holly/holly-yellow-leaves.htm
I planted a Blue Maid holly - about 3 feet tall - last Oct. and it survived beautifully. The last two days all of the beautiful green, not yellow at all, have fallen off the tree.
I need a little more information. I would take a closer inspection at those leaves - at first glance they may look to be in good condition (dark green and glossy) but a look close-up may reveal paler and some darker blotching, discolored tips\edges, etc. which would yield some clues as to the cause. Are there any leaves left on the tree or did they all shed? Are there any signs of new growth on the tree?
Are there any signs of insects on the tree?
Has your holly been getting sufficient water (or too little or too much)?