The scientific name Apophylia flavovirens (Fairmaire) Coleoptera, leaf armor. Common names such as corn borer, yellow rice bug, borer, etc., are similar pests to wheat stem and leaf beetles. The distribution starts from Jilin in the north, arrives in Taiwan, Hainan, Guangdong, and Guangxi in the south, and runs westward along Hebei and Shanxi, and reaches Medog in Sichuan and Tibet.
Host corn, millet, mint, basil and so on.
Injury The larvae drill in from the base of the stem near the ground or the base of the underground stem, causing the seedlings to wither or die.
Morphological characteristics Adult body length of about 5mm, head dark brown, compound eye develops black, antennae 11 filamentous, base 4 brown, more than dark brown. The chest is dark brown, with a thicker leading edge, and a small engraved dot on the front, with no black markings. Cobbed green, shiny. Dark yellow. Belly brown. All dense brown hair. The egg is about 0.8mm long, oval, smooth surface, yellow. The last instar larvae are 12 mm long, yellowish, and 11 knots with brown heads. Each body has black-brown spots on its back, the middle spot is larger, and two small spots appear on both sides. The spotted bristles have semi-oval or flat tails. Shaped, centrally concave at back, yellow-brown, finely hirsute. Naked cubs are 6mm long and yellow.
Habits of life generation of Shanxi, the winter of eggs in the earth. The larvae began to harm in the middle and late June of the following year. The maize seedlings were about 10 cm high. In the middle and early July, the larvae entered the stage of damage. The larvae burrowed from the stem or underground stem base near the ground. The wormholes are brown, and the severed seedlings die, and the larvae have the habit of transforming plants. Every day from 9:00 to 17:00, the plants are damaged. During the day, many plants are damaged. After mid-July, the larvae are no longer transferred. Injury within the strain, generally 1-6 insects per plant, larvae in mid-late July, cooked, in the soil 1 - 2m Department of soil maggots. During the 4-7 days of the flood season, adults emerged in succession in late July. Adults like to feed on a field picnic.
Control methods (1) Before sowing, use 50% methamidophos EC for seed dressing at an effective dose of 0.3% to 0.5% of the seed weight, and then soak after drying. (2) When it was found that flowering leaves and dead seedlings appeared in the field or when larvae were found to be harmful, 50% parathion EC was sprayed 1000 to 1500 times.
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