Scientific name Atherigona soccata Rondani Diptera, Muscidae. Alias ​​stilt stalk fly, commonly known as stalk fly. Distributed in China's South and Southwest.
Host sorghum.
Injury characteristics Newly hatched larvae feed from near the growing point from the heart leaf gap, causing dead heart seedlings or ear deformities. In severe cases, the dry heart rate is as high as 60% to 70%, or even incomplete.
Morphological characteristics Adult body length is about 4.5mm, grayish yellow, interstitial brownish black, lower jaw black. The male flies have lighter tips, the forefoot thighs are all yellow or the ends are black, and the legs of the female legs are black at the ends of the legs; the male flies have a trapezoidal brown spot on the middle and back sides of the midbrain. The fourth back plate had small brown spots and was nearly round; the backs of the 3rd and 4th abdominal segments of the female flies each had 1 pair of triangular spots, and the 5th quartered spot was very small. The egg length is 1.3mm. The white boat shape is slightly flat at both ends and is wavy. The egg's central longitudinal ridge rises, with a reticular pattern on the mask, and on both sides it resembles the ship's edge. The last instar larvae are 7-8mm long, cricket-shaped, yellowish-white at the beginning of the year, yellow or bright yellow at the time of maturity, and black hooks at the mouth. The total length is 11 knots. The end of section 11 is black, which is the main feature of this species different from other species. It is 3.5-5mm long, cylindrical, brown to dark brown.
Living habits 5-7 years old in the southwest, 11-12 generations in South China, larvae or cockroaches in the late post-fertility sorghum seedlings and soil in the winter. Southern South China can be active all year round without wintering. Adult ecloses are spawned and supplemented with nutrients to spawn. Each female produces 24-34 eggs, and the eggs are scattered among the innermost 3 leaves on the back of the heart, with 1 seed per plant. The larvae hatch from the sorghum horns more than 7 hrs before hatching. The mouth and leaf seams invaded, and dry heart appeared one day after the invasion.
The control method sprays 35% rubidin-containing emulsifiable concentrate 2000 times or 2.5% killing emulsifiable concentrate 3000 times, 20% fenvalerate emulsifiable concentrate 3000 times, and 10% cypermethrin emulsifiable concentrate 4000 times before larvae invade. Every 667m2 spray good liquid 75-100L.
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