The scientific name is Pentfaleus major (Duges) from the order of the order, and from the family Xyloceridae. The long-legged spider corpse Petrobia Latens (Muller) belongs to the order Acanthus. Maiyuan spider is also known as Maixa. Located in the northern latitudes of 29-37 degrees in China; wheat long-legged spiders, also known as Maiyanlu, located in the latitude 34-43 degrees north latitude, the main damage area in the south of the Great Wall, the north of the Yellow River drought, high dry wheat area. In some areas, the two are mixed and mixed.

Both host wheat spiders are harmful to wheat and barley. Maiyuan spiders also harm peas, broad beans, oil radish, and milk vetch, etc.; wheat long leg spiders also harm cotton, soybeans, mulberry, etc.

The traits were as follows: adult nymphs and nymphs used to eat wheat leaf sap. Small white spots appeared on the victim's leaves, the yellow leaves of the rear wheat were turned into yellow, the wheat was poorly grown, the plants were short, and the whole plant was dry. Investigations in Lujiang County, Jiangsu Province have become increasingly serious in recent years.

Morphological characteristics Maiyuan spider adult body length 0.6-0.98mm, width 0.43-0.65mm, oval, dark brown. 4 pairs of feet, the first pair of long, the fourth pair of second, 2, 3 pairs of equal length. With back anal. Foot, red around the anus. The egg length is about 0.2mm, oval, dark brown at first, and light red afterwards. If you have a total of 4 years old. One-year-old cubs, 3 pairs of feet, early light red, after the grass green to dark brown. 2, 3, 4 infancy 4 pairs of feet, the body is like a pimple.

The length of the legged spiders is 0.62 to 0.85 mm, and the body is spindle-shaped. The two ends are pointed, and the purple-red to brown green. 4 pairs of feet, of which 1.4 pairs are particularly long. There are 2 types of egg: Over summer, egg cylindrical, 0.18mm long, white wax on the surface of the egg shell, white waxy material on the top, like a straw hat, with radial stripes on the egg's top; non-overseas ovoid, pink , 0.15mm long, surface dozens of uplift stripes. A total of 3 instar nymphs. One-year-old cub, 3

For the foot, it was bright red at the beginning, black-brown after smoking, and 4 pairs of feet at age 2 and 3, and the body shape was like a pimple.

Life habits Maiyuan spiders are born 2-3 generations in the spring, that is, 1 generation of breeding in spring, 1-2 generations of autumn, and 1 generation of 46-80 days to complete the wintering of adults or eggs and nymphs. In winter, it is hardly dormant, and its cold-resistance is strong. In late March and March, it is hatched in winter and then hatched. In the middle and late March and early April, there were a large number of insect populations, and most of them died in late April. Adults laid their eggs on wheat aphids or clods, and hatched eggs in October. They infested seedlings in autumn. Multi-line parthenogenesis, each female produces more than 20 eggs; in the spring, many eggs are produced in the wheat tiller or clumps, and in the autumn they are prolific on the fibrous roots or clods, and are gathered in piles, each dozens of eggs. The period of 20 to 90 days, the summer egg period of 4-5 months. The optimum temperature for growth and development is 8-15°C, and the relative humidity is higher than 70%. The irrigated land is prone to occur. Early spring rainfall in Jiangsu is a key factor affecting the degree of occurrence of this spider. Wheat legged spiders are born 3 to 4 years old, adults and eggs overwinter, adult springs begin to breed in late March and March, wintering eggs begin to hatch, field insects are abundant from April to May, and adults lay their eggs after summer and mid-May. In mid-October, eggs hatched in mid-summer and harmed wheat seedlings. It takes 24-46 days to complete a generation. Multiple lines of parthenogenetic reproduction. The eggs are produced in hard soil blocks or small stones and stalks or fecal blocks in the wheat fields. The adult nymphs are also clustered and have a false death, which occurs mainly in dryland wheat fields.

Prevention and control methods (1) Rotate crops in accordance with local conditions and dump crops after harvest; in winter and spring, irrigation can destroy their habitat and reduce damage. (2) Before sowing, use 75% 3911 emulsion o.5kg, water 15-25kg, mixed with wheat seed 150-250kg, and sow 12 hours after mixing. (3) If necessary, use 2% chlorimicarb or 1,50% dimethoate powder, 1.5-2.5kg spray powder per 667m2, or 30-40kg of fine soil detoxification soil. (4) Spray 40% omethoate EC or 40% Dimethoate EC 1500 times when the population of insects is large, and apply 75kg per 667m2. (5) Baume 0.3-0.5 degree lime sulfur or 50% sulfur suspension agent 667m2 can also be sprayed with 200-4008 water 50-75kg, which can effectively control wheat spiders, and can also treat powdery mildew and rust.

(6) When the above measures do not work, spray 15% of Lingling EC 2000 to 3000 times or 20% of phytoalexin (eclosion dioxin) EC 3000 to 4000 times of liquid, 36% of Hcl fly oil 1000 - 1500 times liquid, valid for 10-15 days.

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