[Distribution and Damage] Oscinella frit Linne occurs mainly in North China, Northwest China, and Inner Mongolia, where it damages wheat, barley, oats, and rye. The larvae invade the heart and young leaves causing damage. Among them, wheat victims in Xinjiang are heavier.
ã€Morphological characteristics】 Adult body length 1.5 ~ 2 mm, black shiny, balance stick yellow, black leg section, ganglion and knot brown-yellow, the middle part of the hind foot pole black. Egg white, oblong, about 0.5 mm. The larvae are yellowish-white, verrucose, ca. 4.5 mm, with two short projections at the ends and stomata. About 3 mm long, tan.
Occurrence regularity occurs in the northwestern region for 1 to 3 generations, and larvae winterize in winter wheat seedlings. In mid-April, pupae began to dissipate in straw, and at the end of April began to become adult. In Urumqi, the first generation of adults laid eggs on winter wheat and spring wheat and caused damage to the main stem of spring wheat. Eggs are prolific in the inner leaves near the leaf sheath, the second generation is parasitized on the grass weeds, the third generation larvae endangered early sowing winter wheat at the end of August, and the main stem of winter wheat is damaged from September to October, resulting in yellow leaves or tillers And wintering in winter wheat.
[control methods]
1. Agricultural measures After the wheat harvest, the crops are ploughed off, the falling grains are allowed to germinate, and the adult fly is spawned, then the fallover is eliminated in autumn.
2. Chemical control with 50% methyl 1605 EC 2000 times solution, when the 2 or 3 leaves of wheat seedlings, the adults are sprayed for the first time during the peak period, and then sprayed once every 6 to 7 days. Every 666.7 square meters with 2.5% trichlorfon powder or 0.04% insecticide powder evenly sprayed, can also achieve good control effect.
ã€Morphological characteristics】 Adult body length 1.5 ~ 2 mm, black shiny, balance stick yellow, black leg section, ganglion and knot brown-yellow, the middle part of the hind foot pole black. Egg white, oblong, about 0.5 mm. The larvae are yellowish-white, verrucose, ca. 4.5 mm, with two short projections at the ends and stomata. About 3 mm long, tan.
Occurrence regularity occurs in the northwestern region for 1 to 3 generations, and larvae winterize in winter wheat seedlings. In mid-April, pupae began to dissipate in straw, and at the end of April began to become adult. In Urumqi, the first generation of adults laid eggs on winter wheat and spring wheat and caused damage to the main stem of spring wheat. Eggs are prolific in the inner leaves near the leaf sheath, the second generation is parasitized on the grass weeds, the third generation larvae endangered early sowing winter wheat at the end of August, and the main stem of winter wheat is damaged from September to October, resulting in yellow leaves or tillers And wintering in winter wheat.
[control methods]
1. Agricultural measures After the wheat harvest, the crops are ploughed off, the falling grains are allowed to germinate, and the adult fly is spawned, then the fallover is eliminated in autumn.
2. Chemical control with 50% methyl 1605 EC 2000 times solution, when the 2 or 3 leaves of wheat seedlings, the adults are sprayed for the first time during the peak period, and then sprayed once every 6 to 7 days. Every 666.7 square meters with 2.5% trichlorfon powder or 0.04% insecticide powder evenly sprayed, can also achieve good control effect.