Healthy fruit trees are the result of good care. One of the more important aspects of getting good fruit and having beautiful, blooming fruit and nut trees is the winter spraying regimen. This is a job all too frequently overlooked even in mild winter climates which offer plenty of time to do the job. There are many ways to protect fruit trees from destructive weather and pests but don’t forget winter fruit tree spraying. It should start in the autumn, as soon as trees drop their leaves, and continue until springtime opens the blossoms.
Fruit and nut tree varieties should be selected for your climate – or even microclimate. They all have different needs. Equally, fungal infections and insect pests have favorite areas and favorite host trees. For example, in warmer coastal parts of Los Angeles, citrus trees fall easy prey to scale, whitefly and mealybug. In others areas, black rot can eat into the limbs of stone fruit trees (plum, apricot, nectarine, etc.). Fire blight can turn branches of fruiting and ornamental pears black just about everywhere. And leaf-rollers and aphids can attack a whole assortment of fruit trees in warm winter climates where they are not killed off by frosts.
Just as you have a lot of choices with tree cultivars, you also have a wide range of tree protecting sprays. There are plenty of commercial products for sale, but I prefer to use the organic or old fashioned remedies that are less toxic and work as well – if not better. The best sprays to use in autumn and winter are the dormant oil sprays, usually lime-sulfur or copper-sulfate. These sprays will help suffocate over-wintering insects and can function as fungicides. Neem® is an organic spray that is also used safely to kill insect pests on edibles. Try to spray trees as soon as you can after leaf drop and, ideally, spray every three to four weeks until the flower buds swell. Sprays can harm pollinating insects, so avoid any treatments while trees are in bloom. Do not use lime in any form on apricot trees – especially after they bud up – since they are lime sensitive. For more sensitive and evergreen fruit trees growing in the milder regions, try using a lighter fine oil spray made for leaf contact. Most of these treatments are all-natural and organically acceptable.
It is best to spray when winds are not blowing. Coat the whole tree from branch tips to base. Some fruit or nut trees can also be sprayed after bud drop. Do a little research into the needs of your specific kind of fruit tree(s). Make sure you read the labels and follow directions carefully. It is important to use the right proportions when mixing with water.
Weather and timing are critical for fruit spraying to be most effective. Proper winter spraying of fruit trees can make the difference between beautiful, fruitful trees and struggling, nonproductive trees. Sometimes these treatments can even save a tree’s life.