I've been growing a peach tree for four years now. It blooms beautifully in spring and sets fruit, but then in July and August the fruit drops off. What could be causing this? Could it be lack of watering, or is it a disease?
Peaches drop their fruit not so much from disease as from stress - it's a protective mechanism when the tree can't sustain the entire crop. Usually it's a lack of moisture in July and August, when the fruits are actively growing and need a lot of water, or a nutrient deficiency (especially potassium). Try increasing watering during the heat and feed your peach tree in summer with a balanced fertilizer that emphasizes potassium - often that solves the problem. You should also thin out the fruit manually at an early stage, keeping only the largest fruits, so the tree doesn't get overloaded.
My peach had exactly the same problem - it flowers beautifully in spring, then starts dropping fruit in summer. I blamed everything for a long time until I realized it was all about watering. Peaches need regular moisture in July and August, especially when it's hot out. I started watering more often (roughly every three days during heat waves), and the results showed up the next season - way more fruit set stayed on.
But it's not just about how much water you give, it's about consistency. If you alternate between drying out and heavy watering, the stress sticks around and the fruit still drops. I noticed that once I switched to even, steady watering, my peach stopped losing three-quarters of its crop. While you're at it, check if it's getting enough nutrients - you can give it a summer feeding with a potassium-phosphorus fertilizer, and that helps the fruit hang on too.
Disease can happen, sure, but usually you'd see clearer symptoms on the leaves and branches. If the rest of the canopy looks healthy, it's probably a moisture or nutrition shortage causing this, not some infection.
Have you noticed whether the soil under your peach tree gets cracked during summer heat? It's often not just about the amount of water, but how it's distributed - sudden swings in soil moisture (drying out one moment, then getting waterlogged) cause more stress than just plain dryness. Try mulching around the base of the tree and watering more frequently but in smaller amounts, so the soil stays consistently moist rather than swinging back and forth between dry and muddy.
Watering is indeed a key factor, but I'd clarify: it's not just about how much water you give, but how exactly you deliver it. In summer, peaches need deep but infrequent watering - roughly once a week, but abundantly, so the water reaches the root depth. If you water often and just a little bit, the soil will be wet on top while staying dry below, and the tree will still be under stress. I'd recommend mulching the tree base with grass or straw - it stabilizes moisture and prevents sudden fluctuations.
Beyond that, pay attention to nutrition. In summer, when fruit is actively growing, peaches can lack potassium and magnesium - these are the elements needed to hold onto the fruit set. If you're not fertilizing it in summer, try applying a balanced fertilizer with an emphasis on potassium and phosphorus around June-July. Nitrogen during this time is better kept to a minimum, otherwise you'll get excessive leaf growth at the expense of the fruit.
And one more thing - check for pests or fungi. Sometimes fruit drops because of infection, and it looks just like stress from drought. If you see spots, deformations, or any coating on the fruit before it falls - that's a reason to treat it with fungicide.
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