What the best spray to combat leaf curl? Is copper suitable or is there something else?
Assuming you are referring to fruit trees, the only treatment is to minimize stress by supplying additional fertilizer and irrigation as well as removing some of the fruit load. Applying a fungicide in autumn will help prevent future problems. You can also try spraying some in spring prior to bud swelling. While it is often deemed to be less effective than fixed copper products, lime sulphur is an acceptable form of organic control for this disease.
How to see/understand the difference between male and female fruit trees? Is there a list of trees that need both to pollinate? How do I see the difference in real life? I am looking forward to hearing from you,
Lena
Not all fruit tree have male and female. Most have perfect flowers, which means the male and female parts are contained in one flower.
On the fruit plants that have male and female, typically you can find the immature fruit either inside the flower or right below the flower on the female. It will look like a tiny, green version of the mature fruit, typically.
I live on 40 wooded acres in Arkansas. This year, for the first time we are invaded with thousands of tent worms. They are on our fruit trees, ornamentals, the house, our legs if you stand still for 10 seconds, and anything outside. Spraying with Sevin kills them but there are so many it seems senseless. How do we get rid of them and keep them away?
Here is an article that you may find helpful: https://www.gardeningknowhow.com/problems/pests/tent-worms-tent-caterpillar-home-remedy.htm
What sort of fertilizer for fruit trees and bushes?
For fruiting plants, you want something that has a little more phosphorous. Plants need phosphorous to flower and grow fruit and a little extra will help fruiting plant produce better.
I would suggest taking a soil sample to your county extension office. They canthe exact amounts and types. The problem with recommending fertilizer is you can set the tree back from producing fruit, waste money on nutrients the tree doesn't need and cause to much growth.
What would the reason be for lots of plant growth but very little fruit?
Too much nitrogen. This causes lots of lush foliage growth but little to no blooms or fruit. You can fix this by adding more phosphorus to the soil either with a phosphorus-rich fertilizer or bone meal. These articles will help: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm
My tree suffers from continuous leaf loss, falling in spring and summer. The leaves have dark brown spots and I have found an area of the trunk, about 4-5 feet from the ground, that looks abnormal--no boring or holes. I do not know what type of tree this is. It is more than 10 years old. It bears tiny green fruit that the birds eat. The fruit is also falling from the tree. Please help.
It could be either a fungus or pests. I would treat the plants with neem oil. It treats both fungus and pests. Here is more information on it:
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
What is the best time to plant fruit trees in Mallorca?
Given the climate in Mallorca, I would recommend planting trees in very early spring and that you use a heavy watering routine for them through the first summer after they are planted. This will provide them with enough time to become established before the heat and will help their tender roots thrive for the first summer.
Be sure to remove any fruit that may start to develop the first year. The trees should be spending their energy developing roots instead of fruit and you will have a better quality fruit and harvest in future years by letting them do this the first year.