Diseases of irises

Bacteriosis is the most terrible disease of irises in our region, causing rhizome rot. Plants affected by the disease stop blooming, their leaf fan is low, containing 3-4 leaves. Dig out the plant, separate the rotten parts of the rhizome, etch for half an hour in raspberry-colored potassium permanganate. Then change the soil, adding more sand to the new soil mixture (or change the planting site), and plant the iris again.

Wet rot - damages the rhizomes of the iris and the base of the stems. In plants, the leaves turn brown and wither, starting from the tips, and the plants lag behind in growth. The rot spreads inside the rhizome, which becomes powdery, while preserving the outer shell of the roots. The bacterium, the causative agent of wet rot, is most often introduced into the soil with manure. Diseased plants should be destroyed immediately and it is advisable not to plant irises in this place for 5 years or disinfect the soil well. Preventive measures: before planting the iris, etch the cuttings in potassium permanganate for 30 minutes (0.5 teaspoons per 0.5 liters of water), or in a solution of "Phytosporin" or in a solution of "Maxim".

Gray rot – damages both the rhizome and the leaves of the iris. The affected parts of the rhizome become infected with dry rot, and a gray plaque forms on the leaves, causing them to rot. The disease is caused by increased soil and air humidity, as well as excess nitrogen in the soil.

Heterosporiosis affects the leaves, on which gray spots with a watery yellowish border appear in the second half of summer, causing the leaves to shrink, usually in the second half of summer. Spraying with Zircon or any preparation containing copper (most simply with copper chloride) helps. Affected iris leaves should be removed and burned.

Rust – affects the leaves of the iris, brownish-brown stripes appear on them. You can spray the iris leaves with colloidal sulfur or a copper-containing preparation, and top them with phosphorus or potassium. It usually affects only weakened plants.