When did apricot trees turn yellow?

Apricot trees are trees, and leaves begin to turn yellow every autumn. Apricot trees are 5-8 meters high; The crown is round, oblate or rectangular; Bark grayish brown, longitudinally cracked; Perennial branches are light brown, with large and horizontal lenticels, and annual branches are light reddish brown, shiny and hairless, with many small lenticels. Leaf blade is broadly ovoid or ovoid, 5-9 cm long and 4-8 cm wide, with acute to short acuminate apex, rounded to nearly cardioid base, leaf margin with obtuse serrations, glabrous on both sides or pilose between veins; The petiole is 2-3.5 cm long and hairless, and there are often 1-6 glands at the base.