Scientific name Tetraneura ulmi (Linnaeus) Synonyms T. Akinire Sasaki is a member of the order Homoptera. Alias ​​Valley, autumn four veins and cotton, high sorghum roots. Distribution Henan, Inner Mongolia, Ningxia, Gansu, Shaanxi, Liaoning and other provinces.
The host is the first host of eucalyptus; the second host is sorghum, millet, and scorpion.
The damage characteristics damage the roots of sorghum and corn, causing yellowing. When the eucalyptus is infested, it forms a red bag-shaped insect slender on the leaf surface.
Morphological characteristics Wingless orphan female body length 2.0-2.5mm, oval, body apricot yellow, grayish green or purple, the body was a radial waxy wool, tentacles, 4 short. The cockroach was short and thick and spear-shaped, exceeding the base section of the forefoot. Abdomen tube degenerates. Semi-circular tail, with 5-7 hairs. Winged females are 2.5-3.0mm long. The head and chest are black, the belly is grey-green to gray-brown, the antennae are 4 knots, the midribs of the forewings are not bifurcated, 4 in total, 1 in the midrib of the hind wings, and there is no abdomen. The egg is oval in shape and is 1 mm long. It turns black after the first yellow and is shiny, with one tiny protrusion at one end.
Life habits Henan, Ningxia, more than 10 generations old, the eggs in the twigs dry, bark seam winter. In late April of the following year, the overwintering egg is hatched as a dry female parent, climbing to the back of a newly sprouting eucalyptus leaf. In the first half of May, a purple-red or yellow-green, bristly bag-shaped larvae are formed on the victim leaf surface. In the midst of this month, dry maternal maturation occurs in the middle of May. In the case of the larvae, the larvae of the female larvae, that is, the females of the dry female raccoon, each dry mother can breed 8 to 15 or more, from late May to early June. The winged dry females grow into springs, also known as spring migration, and move to sorghum and corn roots to breed. In late September, winged mothers are born again, fly back to the twigs to produce sexual warts, and winter after mating. Each female produces 1 egg and is produced under the body. Natural enemies have ladybugs on the food, food fly, etc.
Control methods (1) When the root carcass is seriously damaged, use 40% Dimethoate 1kg plus ammonium chloride fertilizer 25-30kg, 500kg of water, pour the roots, and pay attention to prevent injury during drought. (2) 50% phoxim EC may also be used to irrigate rooted areas where conditions permit.
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