The scientific name of this insect is *Hydrellia griseola* (Fallen), which belongs to the order Diptera and Hymenoptera. It is commonly found in Northeast China, North China, Zhejiang, and other regions. This species primarily targets rice plants as well as certain grassy weeds.
The larvae of *H. griseola* feed on the leaves of rice plants, causing them to turn yellow, dry, or even rot. In severe infestations, entire plants may die, leading to significant yield losses. The damage typically occurs during the early growth stages of rice, making timely intervention crucial.
Morphologically, the adult insect measures between 2 to 3 mm in length and has a bluish-gray coloration. Its antennae are black, with segment 3 being flat and nearly elliptical. The antennae feature long, thick tentacles, one mandrille, and five short hairs on the side of the awn. Two small bristles are present on the leading edge of the wing, and there is no space for the hip. The legs are gray and black, with the base of the first and second tarsi showing a yellow-brown hue.
The eggs are oval-shaped, milky white, and covered with fine vertical lines. The last instar larvae measure about 3 to 4 mm in length, with a slightly flattened cylindrical shape. They range in color from milky white to creamy yellow and have two dark brown valve-like protrusions at their ends. Mature larvae are approximately 3.6 mm long, yellow-brown in color, and also possess two black valve protrusions at the tip.
In terms of life habits, *H. griseola* completes 4 to 5 generations per year in the northeastern region. Adults overwinter along ditches among weeds and become active in late spring. The first generation emerges in weed-infested fields, and after the first generation, the population increases significantly in paddy areas.
During the period of seedling emergence in rice fields, these insects lay eggs in the water. Under deep water conditions, eggs are scattered on the tips of drooping or flat surfaces. When the water level is too high or the rice seedlings are sparse, the damage becomes more severe. The main period of damage occurs from the time the rice seedlings start to emerge until the transplanting stage. Once the rice grows strong and healthy, it becomes less vulnerable, and the adults move to surrounding weeds to reproduce.
For control, it's important to remove weeds from paddy fields promptly. The primary focus should be on managing the second generation by killing newly hatched larvae and treating adult populations. For specific pesticide options, refer to information on *Philippine eyed waterflies*, as similar control methods may apply.
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