Chemicals for Fruit Trees

If cared for correctly, fruit trees will offer delicious crops which it is possible to enjoy directly from the branch. Certain substances can help maintain your own fruit trees healthy by controlling pests, treating ailments and supplying nutrients. All you have to do is select the suitable substance for the task.


Fungicides help control diseases brought on by fungal pathogens which attack and damage trees. Neem oil controls powdery mildew spores, scab and rust. Liquid cooper fungicides — including Bordeaux mixture, that can be a combination of copper sulfate and lime — control the two fungal and bacterial diseases like leaf spots, brown rot, leaf curl, anthracnose and fire blight. Sulfur prevents the spores of fungal pathogens from germinating and may be used as a preventive spray against rust, powdery mildew and other fungal diseases. Benomyl controls a broad collection of fungal diseases, including brown rot, leaf spot and powdery mildew. Captan controls fungal pathogens like brown rot, scab and cherry leaf spot, but might worsen powdery mildew infestations. Fungicides containing mancozeb control rust, scab and fruit spot.


Horticultural oil is commonly used as a dormant spray to control overwintering insects such as mites, scales and aphids, and their own eggs. Insecticidal soap controls spider mites, aphids and scales. Both horticultural oil and insecticidal soap have a very low toxicity level to beneficial insects, like bees, and insecticidal soap may be used on fruit trees up to this day of harvest. Carbaryl and permethrin control maggots, fruitworms, leafhopper, mealybugs, leafroller, scale, aphids and pear slug. Both insecticides are toxic to beneficial insects and cannot be used on fruit trees within 7 days of harvest; mites may increase with repeated permethrin therapies. Bacillus thuringiensis targets only the larvae of certain butterflies and moths, like fruitworms, leafrollers and caterpillars, isn’t toxic to beneficial insects or bees, and is safe to use until the day of harvest. Pyrethrins is just a plant-based insecticide controlling earwigs, whitflies, beetles, aphids and leafhoppers. It can be utilized up to this day prior to harvest but repeated use increases the number of mites on the tree.


Carried by insects and spread by rain, bacteria will enter fruit trees through wounds, flowers and openings. Copper sprays, including bordeaux combination, control bacterial diseases like fire blight and bacterial leaf spots. Young leaf of apple, pear and plum trees are sensitive to copper sprays; if using copper bactericides on those copper-sensitive fruit trees in the spring after the dormancy period is finished, use a diluted mixture to avoid unintended leaf damage. Streptomycin sulfate heals fire blight on apple and pear trees, but cannot be used on apple trees within 50 days of harvest or on pear trees within 30 days of harvest.


Fertilizers supply the nutrients which fruit trees need for vigorous growth, flowering and fruit production. Balanced fertilizers containing nitrogen, phosphorous and potassium, and will help keep trees healthy. But Penn State College of Agricultural Sciences recommends performing a foliar analysis to ascertain exactly what nutrients that the fruit tree is missing to reduce the chance of nutrient toxicity and above fertilization. Every species of fruit tree has their own particular amount of nitrogen, phosphorous and potassium they should receive. As an instance, plums, cherries and apples need about 3 to 8 ounces of 10-5-10 fertilizer for each and every year of this tree age, not to exceed 8 lbs of fertilizer for a ripe fruit tree. Follow the recommended ratio and directions located on the fertilizer label to avoid accidental harm to the fruit.

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