Bulb mite

Rhizoglyphus setosus is a destructive soil-dwelling pest belonging to the order Sarcoptiformes and the family Acaridae. This microscopic mite is a notorious primary pest that attacks various bulbous plants, especially in greenhouses and during storage periods.

The mite specializes in feeding on bulbs and corm crops. Its primary hosts include lilies, tulips, hyacinths, gladioli, and narcissi. Additionally, it causes significant economic losses to vegetable crops such as onions and garlic by burrowing into the basal plates of the bulbs.

The life cycle of the bulb mite is highly dependent on environmental conditions, thriving in high humidity and temperatures between +20°C and +25°C. When conditions become unfavorable, the mite can produce a resistant stage known as a hypopus, which allows it to survive in the soil or storage environment for extended periods.

Damage symptoms begin with the mite feeding on the basal plate, which weakens the plant and leads to stunted growth. The mites create holes and tunnels in the bulbs, which facilitate the entry of pathogenic fungi and bacteria. Eventually, the interior of the bulb is completely destroyed, leading to plant death.

• Hot water treatment of bulbs before planting to eliminate infestations.
• Maintaining low humidity and good ventilation in storage facilities.
• Regular inspection and removal of infected bulbs to prevent spread.
• Soil treatment with authorized acaricides or soil drenches.

Effective management requires a multi-pronged approach focusing on prevention. By combining rigorous sanitation practices with chemical control and proper storage conditions, growers can significantly reduce the impact of this persistent and damaging pest.