Wheat water fly

The scientific name HydrelliachinensisQietLi is called wheat sheath hairy eye water fly and HydrelliagriseolaFallen is called rice small hairy eye water fly. All belong to Diptera, Muscidae. Alias rice leaf miner, barley water fly, etc. Commonly known as sheath Liriomyza sinensis. Distributed in North China, East China, Northeast China, Gansu, Southwest wheat areas.

Host @, barley, rye, oats, rice, etc.

The main damage characteristics are the above-mentioned host leaf sheaths, most of them damage the leaf sheaths of two leaves below the flag leaf, and a few are harmful leaves. During the damage, the larvae drill into the tissues between the inner and outer skins of the potential leaf sheath or leaves to form a straight or irregular submersible passageway, which often has no obvious feces, and only the epidermis is left in the later stage. As a result, the leaves dried up early or could not heading or empty grains appeared.

The morphological characteristics of the adult are 2-4mm long, wingspan 5mm, dark body color, black antennae, 1 pair of wings, 2 notches on the leading edge of the wing, and the hind wing becomes a balance stick, bright red. Egg long 0.7mm, oval, milky white, egg surface mask longitudinal lines. The body length of the last instar larvae is 4-4.5mm, flat cylindrical, light yellowish white, and the mouth hook is thick black. The pupa is long 4mm, initially yellowish brown, with 2 small black protuberances at the tail end.

The living habits are 2 generations a year in Gansu and 4 generations in southwest wheat region, overwintering with pupae in leaf sheaths. After the emergence of adults in the southwest wheat region from February to April of the following year, they first sucked nectar to supplement nutrition in the flowering rape field, and after mating, the eggs were laid in the flag leaves of wheat from booting to heading or at the frontal base of the upper leaves of the plant, with several to more than 10 eggs per leaf, as many as 40-50 eggs, the egg period was 40-50, the egg period was 10 days, the larval stage was 1319 days, and the larvae were harmful from March to April. The mature larvae pupated in the leaf sheath in early April. Sometimes more than 20 heads are gathered. In the northern wheat region, the overwintering adults began to move in the middle of May, mated and laid eggs, the larvae began in early June, entered the peak period in mid-late June, pupated in July, and emerged in the middle of July. The second generation laid eggs on weeds or self-growing wheat seedlings, and the larvae began to pupate and overwinter in late autumn. The occurrence of wheat water fly is closely related to the characters of the variety. the varieties with tender and dark upper leaves, wide and thick flesh, thick and sunken veins will lay more eggs and suffer heavily.

Control methods (1) select insect-resistant varieties with hard stems and moderate leaves. (2) Forecast: when the egg-laying rate of wheat is about 10%, and the average number of eggs laid is more than 10, when entering the full hatching period, spray 1500 times of 90% crystal trichlorfon or 1500-2000 times of 50% fenitrothion EC, 1000 ~ 1500 times of 36% mites EC, 2000 times of 40% dimethoate EC, 75L per 667m2.