Spray them when their first growing, an you want to spray them so the insects dont get in them when you pick it.
Dormant oil is used in orchards a lot of the time. It is made of refined petroleum and designed specially for orchard trees.
The most effective control for scale on Magnolia trees is probably Dormant Oil, also known as Ultra-fine Horticultural Oil. There are some specific guidelines to spraying Dormant Oil: The temperature should be between 45 and 85 degrees F., humidity under 50%, and no freeze expected within 72 hours. You can only spray the tree once a month, although if you cover it thoroughly, undersides of leaves as well, only one spray is usually necessary. The oil dries quickly and smothers the scale insect.
Tow weeks prior to budding spray dormant oil on the tree mixed with a lime/sulfur compound. Kits are available from most green houses and hardware stores. Spay treat the trees again after the blossoms have dropped. and do a repeat spray of lime/sulfur when the apples have set. A final spray in fall after harvest will help keep fungus and insects from overwintering.
It depends on what you are spraying. There are different schedules for different parts of the country and whether you are going organic or semi-organic or whatever. Usually, there is an application of horticultural dormant oil ( winter rate) after a mid winter pruning and then subsequent sprayings of insecticide and fungicides at different stages of development, such as before the buds open, after the flowers have dropped and during fruit development.Check with your local state agricultural office for a full schedule and list of products.
A spray based with oil which has been chemically treated to have as little water as possible. (It is still a spray, however.)
Any quality spray, such as Olive Oil.
The oil spray is the hardest item to get in canyon defense. Build ten walls to unlock it. It will spray oil on the enemy, causing it to lose it's steering gradually.
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You can't plant a peach tree from a seed but you can growa peach tree from a seed.Just put the seed in the ground keep it watered if there is no rain. The peach tree that grows from the seed may not be a good tree and it may take years to produce fruit it is best to buy a grafted tree and plant that.
Oil would prevent the plant from taking in air. The plant would die. When a plant is dormant, you can put dormant oil on them to kill insects.
Most Parm oil trees are grown in Indonesia
Just buy a can of spray on degreaser or something like Spray Power. Wipe off as much of the oil as possible, then spray it on the underside of the hood and then rinse if off.