Last fall, he planted a horse chestnut. And this summer, problems immediately - almost all the leaves with foci of necrosis. I have never seen this on chestnuts. What could be the problem, help with advice.
The reasons can be very different - freezing in winter, dying of roots, drought (both soil and air), damage by fungus fungi, and other adverse factors. Review your growing conditions. You can also spray the leaves of the plant with Zircon or pour them roots. To do this, take one ampoule of the drug, dilute in one bucket of water, and then decide to spray or pour yourself.