Bulb scale mite

Symptoms
Bulbs infested with bulb mites may rot and fail to produce new growth, or new growth may be off color, stunted, and distorted. Infected bulbs are abnormally dry, often small and somewhat soft. Mites feeding on the leaves causes yellow spots and streaks. Once the mites are inside the bulb, they rapidly turn the bulbs into rotten pulp.

Spot them
Bulb scale mite are hard to see. Mature bulb mites vary from 0.5 to 0.9 mm long and have four pairs of legs. Their bodies are shiny, white, somewhat transparent, and smooth with reddish brown appendages.