The scientific name of this insect is *Hydrellia griseola* (Fallen), belonging to the order Diptera and Hymenoptera. It is commonly found in Northeast China, North China, Zhejiang, and other regions. This species primarily affects rice plants and certain grassy weeds.
The larvae are known to feed on the leaves of rice plants, causing them to yellow, dry out, or even rot. In severe infestations, the entire plant can die, leading to significant crop losses.
Morphological characteristics: The adult is small, measuring 2–3 mm in length, with a blue-gray coloration. Its antennae are black, with segment 3 being flat and nearly elliptical, featuring long, thick tentacles. There is one mandrille, and five short hairs are located on the side of the awn. Two bristles appear on the leading edge of the pulse, and there is no hip space. The legs are gray and black, with the base of the first and second legs showing a yellow-brown color. The eggs are oval, milky white, and have fine vertical lines. The last instar larvae measure 3–4 mm in length, are slightly flattened and cylindrical, with a milky to creamy yellow color. At the end, they have two dark brown valve protrusions. A slightly larger larva, about 3.6 mm long, is yellow-brown with two black valve protrusions at the tip.
Life habits: In the Northeast region, *H. griseola* completes 4–5 generations per year. Adults overwinter in ditches along weed areas. During late spring, the first generation emerges in weed fields, and a second generation appears in paddy fields after the first generation has developed. This pest is particularly active during the early stages of rice growth, especially when water levels are high and seedlings are sparse, which increases the likelihood of damage.
The main period of damage occurs from the time rice seedlings start to emerge until the transplanting stage. Once the rice plants grow strong and healthy, they become less vulnerable, and the adults move to nearby weeds to reproduce. This behavior highlights the importance of monitoring both rice fields and surrounding weed areas for effective management.
Control methods include timely removal of weeds in paddy fields. The primary focus should be on controlling the second generation, targeting newly hatched larvae and adult populations. For chemical control, refer to guidelines for managing similar pests like *Parathrips* species to determine the appropriate insecticides. Integrated pest management practices, such as cultural controls and biological interventions, can also help reduce population levels effectively.
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