The scientific name is Hydrellia chinensis Qi et Li, which is known as Hymenolepis hydropiper and Hydrellia griseola Fallen. Both belong to Diptera, Hymenoptera. Alias ​​rice leaves, barley water fly and so on. Commonly known as sheath lizard. Distribution of North China, East China, Northeast China, Gansu, Southwestern wheat area.
Hosts wheat, barley, rye, oats, rice and so on.
The main features of the damage are the above-mentioned host leaf sheaths, most of which are leaf sheaths of 1-2 leaves below the flag leaf, and a few of them are damaged leaves. When the harmful larvae drill potential sheaths or leaves, the tissues between the inner and outer epidermis form straight or irregular tracts. There are often no obvious feces in the sinuses, and only the epidermis remains in the later period. Causes the leaves to dry up prematurely or fail to head or empty pods.
Morphological characteristics Adult body length 2-4mm, wingspan 5mm, dark body color, antennae black, 1 pairs of wings, wings with a lack of front edge 2, the rear wings into a balance stick, bright red. Egg length 0.7mm, oval, milky white, vertical grain surface of eggs. The last instar larvae have a body length of 4 to 4.5 mm, a flat cylindrical shape, a pale yellowish white, and a thick black hook. The dragonfly is 4mm long, yellowish-brown, and has 2 black knobs at the end.
Living habits Gansu born 2 generations, the southwestern wheat district is born 3 to 4 generations, the wintering in the leaf sheath. After the emergence of adults in the southwestern region from February to April of the following year, the nectar was used to make up for nutrients in the flowering rapeseed fields. After mating, the eggs were produced from the booting to the heading of the upper leaves of the flag leaf of the wheat at the heading stage, and each leaf had eggs. Several grains to more than 10 grains, more than 40-50 grains, egg period 4-10 days, larval stage 13-19 days, March-April is the larvae damage period, mature larvae in the early April in the leaf sheath , sometimes aggregating more than 20 heads. In the northern wheat region, the overwintering adult began its activity in mid-May, mating and spawning, larvae originated in early June, entered the peak period in mid-to-late June, metamorphosed in July, and emerged as an adult in mid-July. The second generation lay eggs on weeds or on self-producing wheat seedlings. The larvae harmed and began to pupate in winter. There was a close relationship between the occurrence of wheat fly and the characteristics of the varieties. The leaves on the production were tender and dark, the leaves were thick and fleshy, the veins were thick, and the depressions were deep. There were many eggs and the victims were heavy.
Control methods (1) Selection of insect resistant cultivars with hard stalks and moderate leaves. (2) Forecasting: when the rate of oviposition of wheat plants is about 10%, and the average number of oviposites is more than 10, when it enters the initial stage of early hatchery, spray 90% crystal trichlorfon 1500 times solution or 50% killer pine oil immediately. 1500-2000 times liquid, 36% chlorellafly EC 1000-1500 times, 40% Dimethoate 2000 times, 75L per 667m2 sprayed good liquid.
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