Grey dung fly

Systematic position. The grey dung fly (Paregle cinerella) belongs to the order Diptera and the family Anthomyiidae. It is a well-known species in many agricultural regions, frequently interacting with both decaying organic matter and young seedling tissues.

Affected crops. This pest exhibits polyphagous behavior, targeting a wide range of vegetable and industrial crops. Primary hosts include sugar beets, spinach, various brassicas such as cabbage and radishes, as well as onions. Seedlings and young plants are particularly susceptible to larval feeding.

Biology and life cycle. Paregle cinerella undergoes complete metamorphosis involving egg, larva, pupa, and adult stages. Females lay eggs in the soil near host plants or on decaying vegetation. The larvae are primarily saprophagous but can become phytophagous, burrowing into plant tissues when organic matter is depleted or population density is high.

Nature of damage and harm. The larvae cause significant damage by burrowing into roots and stems, which disrupts water and nutrient uptake. This feeding activity leads to wilting, stunted growth, and death of seedlings. Furthermore, the boreholes created by the larvae often facilitate the entry of secondary pathogens, leading to bacterial rot and further crop loss.

Control measures. Integrated Pest Management (IPM) is essential for controlling this pest. Recommended strategies include:

• Crop rotation to break the pest cycle.
• Deep autumn plowing to expose pupae to predators and adverse weather.
• Proper management and burial of crop residues.
• Application of seed treatments with systemic insecticides.
• Targeted chemical sprays when adult fly populations peak.