The scientific name *Dicladispa armigera* (Olivier) belongs to the order Coleoptera, specifically the family Chrysomelidae. This beetle is commonly found in rice fields located in the southern regions of Liaoning Province, China. It is a polyphagous pest, meaning it feeds on a variety of plants, including rice, wheat, sugarcane, millet, and reeds.
The larvae of *D. armigera* bore into the leaf tissues, feeding on the mesophyll. Severe infestations cause the leaves to appear bluish-white, which can significantly hinder the plant's growth and development. The damage can lead to reduced yield and poor crop quality if left unchecked.
**Morphological Characteristics:**
Adults measure 4–5 mm in length, with a striking blue-black coloration and a metallic sheen. The prothorax has two knob-like protrusions on either side, and the front part of the body features four spines, with larger ones on the rear sides. The elytra have 20–21 spines of varying lengths along each side. The eggs are oval, flat, milky white, and covered with a yellow-brown gelatinous substance. The final instar larvae are about 5–6 mm long, with two rows of knobs on the mid-thoracic to abdominal segments, and triangular structures on both sides of the abdomen. They are flat, oval, and range in color from milky to dark yellow.
**Life Habits:**
In regions such as Jiangxi, Hunan, Hubei, and Zhejiang, *D. armigera* completes three generations per year, while in Guangdong, it may have up to six generations. Adults overwinter in soil cracks, under stones, or among weeds and leaf sheaths. As spring approaches, they move to weed patches or wheat fields before migrating into rice paddies. Eggs are laid within 12–18 cm from the tip of rice leaves. Newly hatched larvae enter the leaf tissue and feed on the inner layers, typically consuming 2–3 leaves during their lifetime. Most larvae move early in the morning. The larval stage lasts 10–15 days, and the pupal stage takes 4–9 days. Adults are most active during the night, early morning, or rainy weather. Their lifespan varies: 30–40 days for the first and second generations, and up to 6–7 months in winter.
**Prevention and Control Methods:**
To manage *D. armigera*, it is important to remove weeds around the fields and ditches. During adult emergence periods, flooding the rice fields can help control populations by trapping adults on the water surface, which can then be collected and destroyed. When the adult population peaks, spraying 50% emulsifiable concentrate of acephate at a dilution of 800 times per 667 m² is effective. Alternatively, during the larval incubation period, applying 90% trichlorfon crystals at a dilution of 900–1000 times can also provide good control. Integrated management practices, such as cultural and chemical methods, are recommended to reduce infestation levels and protect crop yields effectively.
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