What are the latest control methods for ginger root rot?

Ginger generally grows in deep, moist soil, so the main site of disease occurrence is the underground rhizome of ginger, while the above-ground parts rarely suffer from disease. The main underground disease is root rot. As the name implies, root rot mainly causes symptoms of rhizome decay, and it is a directly and seriously harmful disease. If you want to understand the occurrence and control of root rot, you can read this article carefully.

I. Causes of occurrence

The pathogen overwinters as mycelium on seed ginger kept for planting, on rotten diseased plants in the field, or on diseased residues, and then becomes the main source of infection for the next planting season. The pathogen spreads by means of spores produced by the pathogen through rain splash or irrigation water. Because it is a soil-inhabiting bacterium, it generally does not spread through wind. It can directly invade from the rhizome. High planting density, heavy clay soil, unmatured fertilizer, insufficient fertilization, low-lying land, or water accumulation after rain are the main predisposing factors for disease occurrence.

II. Symptoms of damage

The pathogen often first infects the basal stem close to the ground, which turns green and water-soaked after infection. It then develops toward the underground stem, generally causing the buds of the underground stem to turn brown, the above-ground parts to yellow and die, and the stem base to rot and finally fall over on the ground. When seed ginger is damaged, it shows a water-soaked state, and then a large area of white mold grows on the surface, spreading rapidly.

III. Control methods

1. Soaking seed ginger

Before planting, select ginger that has not developed disease during storage and is free of pests and diseases, soak it in the chemical solution for 10 minutes to 20 minutes, and then plant it. Using 200 grams of 50% carbendazim wettable powder added to 100 kilograms of water can soak 100 jin of seed ginger, then dry it in the shade before planting.

2. Selecting land and fertilizing

Choose deep but relatively dry, sunny, well-aerated, fertilizer-retaining sandy loam soil for planting. Fertilization must be sufficient to avoid weak plant growth and susceptibility to disease due to fertilizer deficiency. Then, farmyard manure must be fully matured before application to avoid carrying pathogens and causing harm.

3. Spraying and root drenching

In the early stage of disease occurrence, use about 3 jin of 70% thiophanate-methyl wettable powder or 50% carbendazim wettable powder mixed with soil and broadcast at the stem base to improve the condition, spraying continuously twice with an interval of 3 days to 5 days. Then, when the diseased area is large and the disease is severe, use 46.1% copper hydroxide water-dispersible granules at 500-1000 times dilution or 75% chlorothalonil wettable powder at 1000 times dilution to drench the roots of diseased plants, with 100-150 milliliters of liquid per plant, once every 10 days, for 2 to 3 consecutive drenchings for control.

Root rot is the most serious disease of ginger after ginger blast. Generally, prevention in advance can reduce the possibility of disease occurrence. If it occurs, early-stage control is the best time. Once it becomes severe, root drenching will still result in great losses. The above content is welcome for reading and reference.