Stalk fly

The scientific name Atherigona biseta Karl is Diptera, Muscidae. Alias ​​double hairy mane flies, millet flies and so on. Located in the Northeast, North China, Northwest production area.

The hosts are millet, foxtail, and glutinous rice dumplings.

The larvae damage the millet seedlings to the valley before the heading. The newly hatched larvae invade from the base of the foxtail millet to damage the young shoots and young ears, causing dead heart seedlings. There is no hole in the internodes of the damaged seedling stems. After peeling the outer leaves, Spiral food marks can be seen. In severe cases, the heart leaves are dead or distorted. The inside of the dead heart is rotted, and some form deformed or dead ears.

Morphological characteristics Adult body length 3.5-5mm, small yellow earth fly. The head is black, with three dark vertical stripes in the middle of the khaki gray-green. The wings are transparent, and the forefoot is almost entirely black. Only the base section and the leg ends are yellow, and the midfoot and hindfoot are yellow and the ganglion is dark. The belly stained yellow to orange and nearly conical. The egg is about 1mm long, slightly oblong in shape, white, and the surface has vertical stripes. The larvae are 7-9mm long and pod-shaped. It was translucent at the time of initial hatching, later became ginger yellow, hooked black, and the tail was obtuse with round black valve protrusions. The dragonfly is 4-6mm long, and the cocoon has a long tube shape with one end truncated and the other end slightly rounded. It is white at first and becomes dark brown before emergence.

Life habits are north-eastern, northern Hebei, middle-northern Shanxi, northern Shaanxi and Inner Mongolia. The larvae overwinter and fall into the larvae in late May of the following year. In early June and early July, adults emerged and spawned. The first-generation larvae infested spring vines and setaria in the late June and late July; the second-generation larvae August-September damages summer valley. The second generation of mature larvae except for a few larvae and feathers in August, most of the larvae into the soil winter. It is 3 generations old in the south of Hebei, northwest of Shandong, and Beijing and Tianjin. The overwintering larvae mostly larvae in late May. Overwintering adults prospered in mid-June in mid-June, and spawning peaks in mid-to-late June. During this period, the first generation mainly infested Spring Valley and Setaria, and 2-3 generations of larvae in 7 After the middle of the month, Chungu, Xiagu and Setaria were killed late. In the third generation, the third generation was later planted in the summer and late summer. The mature larvae left the valley in late August and September to enter the soil for winter.

The life span of female adult flies in spring gorge region was 4 l, 6 days, and male flies were 31 days. The egg production per female was 28.1 and 79 were more. In the hot summer valley area, the length of each insect period is shortened, and spawning volume is also small. The worm prefers activities in the early morning and early evening. The eggs are produced in the foliar sheaths near the ground. One l-grain and two-four days of the egg period. The larvae hatch into the base of the heart after hatching. The damage period is more than 20 days old. The larvae crawled out from the stems to the surface 5cm at the surface, and the pupa period was 8-9 days. Overwintering larvae phlegm at 10 cm below the ground. The optimum temperature is 22-26°C, and the optimum relative humidity is 60%-80%. The whole life process of the insect needs higher humidity, and the larvae easily lose water and die when dried. Apply too much nitrogen fertilizer, the plants are soft and vulnerable. Fast-growing, robust grain, and broad leaf blade are early victims of sow damage.

Control methods (1) Promote planting of insect-resistant varieties. Such as the Hebei Academy of Agricultural Sciences 78-l-11-1 hybrid offspring of the insect resistance. Production can choose leaf width, stalk hard products. (2) Suitable early sowing can reduce the damage. (3) Using fermented foods such as stinky fish and rice soup, put them into a flies-flying container, add a small amount of trichlorfon, and trap and kill adult worms in the valley. (4) Sprinkle 2.5% of trichlorfon powder at adult stage, 1.5-2 kg per 667m2, or 40% dimethoate 1000 times or 2.5% 2.5% dimethrin buttermilk 2000 times. 35% Fly Phosphate EC 2000 times, 36% Chlamys farreri 1000 to 1500 times. (5) When Sophora Millis flies heavily in the sowing area, 3% Yingbidan granules 1.5-2.5kg per 667m2; can also be used 3% seed weight 0.2% of 35% carbofuran glue suspension mix Species.