We just planted a nectarine tree this spring, about 8 ft tall. It's in the vicinity of a large redwood tree. This spring, it sprouted nicely, leaves were coming in, flowered beautifully and tons of tiny fruits. Then starting in April, the leaves started dying a bit so we toned back to deeper, less frequent watering. In the meantime, squirrels ransacked all the fruit. But now, the leaves are all very drippy and on the verge of browning/falling off. I have no idea what is going on and would appreciate any ideas!
Nectarines are certainly delicious, but growing they requires a certain amount of care and expertise. This article has basic information: https://www.gardeningknowhow.com/edible/fruits/nectarines/growing-nectarine-fruit-trees.htm
There's more than one condition that could cause dripping. Your best option is to take some samples of leaves and twigs to the local Extension Service, who will be able to diagnose the problem and recommend treatment. This link will help you locate one: https://www.gardeningknowhow.com/extension-search/
Will it pollinate with a gauge plum or any other plum?
Yes, nectarines and plums are both members of the Prunus genus, and as such can be interbred to produce new fruits. If they are growing near each other, they could possibly pollinate each other, although the fruits of the trees would be the nectarine or plum that you were expecting. However, you could plant the seed of such a cross, and a new fruit might appear. It it were any good it would be sheer luck, though, because developing new strains of fruit, such as the pluots which are appearing in stores now, takes much skill and time.
I have a nectarine tree that is 3 years old. I live in Southern CA on the coast. This last winter we had a few days of real cold weather. My tree has only 1 living branch.
I don't think it would get cold enough in southern CA to harm a nectarine, so I suspect something else is going on. You need to think about the general care of the tree, especially soil, water, minerals, and light. This article should get you started: https://www.gardeningknowhow.com/edible/fruits/nectarines/growing-nectarine-fruit-trees.htm
You also need to watch for the common diseases and pests (nectarines are a type of peach, so this article on peach disease will tell you what to look for): https://www.gardeningknowhow.com/edible/fruits/peach/common-peach-diseases.htm
Finally, here's some advice on pruning - look through to the bottom of the article: https://www.gardeningknowhow.com/edible/fruits/peach/peach-tree-thinning.htm
When is the right time to spray my nectarines for curly leaf?
This article will help you with that: https://www.gardeningknowhow.com/edible/fruits/peach/peach-leaf-curl.htm
I purchased a dwarf nectarine tree about 2 months ago and planted as instructed. Today it looks the same as it did when I purchased it, no buds, no leaves, no nothing - just a bare plant. Am I expecting too much too soon?
Here is a link to proper planting instructions of dwarf nectarine trees.
http://www.clemson.edu/extension/hgic/plants/vegetables/tree_fruits_nuts/hgic1354.html
https://www.gardeningknowhow.com/edible/fruits/peach/peach-chill-hours.htm
Last year my nectarine tree was loaded with fruit. Unfortunately, all of it remained green and hard. This year, the tree is again full of fruit. What should I do to assist full maturation of the fruit? The tree is 3 years old and I did fertilize it with 10-10-10 in early spring. Thanks.
Here is a great link to help you get the best possible crop from your tree.
https://www.gardeningknowhow.com/edible/fruits/nectarines/growing-nectarine-fruit-trees.htm
I have used Neem oil on the leaves one time and there is a large amount of leaves that look like they are being eaten. I do see some black spots but not as many. It is not affecting new growth, just the older leaves. Should I continue to use the Neem oil? Also, I have ants that are running up and down the tree. I have used a three-in-one fertilizer that is supposed to take care of this. How long before this takes effect?
It sounds like your tree still has an aphid or mealy bug infestation judging by the presence of ants and black sooty mold. Neem oil kills only pests present on the day they are sprayed, so applications may need to be repeated - I would continue to use the neem oil. When applying neem oil, be sure to spray the leaves thoroughly.
For more information on aphid and mealy bug control and neem oil, please visit the following links:
https://www.gardeningknowhow.com/plant-problems/pests/insects/homemade-aphid-control.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/mealybugs-control.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm