How to control Oxya chinensis

Oxyachinis (Thunberg) belongs to Orthoptera, Acrididae. Distribution in southern and northern China rice areas.

The main pests are rice, Zizania latifolia and other gramineae plants, legumes, convolvulaceae, malvaceae, solanaceae and other plants.

Damage characteristics into, nymph leaves into a lack of food, serious when the whole leaf was eaten up, only residual veins.

Morphological characteristics Adult male body length 15-33mm, female 19-40mm, yellow-green, brownish green, green, green front wing edge, light brown, head broad, oval, head forward extension, face raised wide, two side edges nearly parallel, with longitudinal grooves. compound eye oval, antenna filiform, proctotum posterior transverse groove located behind the middle, proctoweb process conical, slightly inclined backward, wing longer than hind leg segment end. The tail of male insects is subconical, the upper anal plate is short triangular, smooth without lateral grooves, and the tip is acute. The posterior lower horn of the dorsal plane of the 2nd-3rd segment of the female abdomen is spiny, and some of the 3rd segment is not obvious. Spawning petals long, upper and lower petals large, outer edge with fine teeth. The egg is about 3.5 mm long, 1mm wide, long cylindrical, slightly curved in the middle, dark yellow, brown gelatinous oocyst, wrapped outside the egg, the sac contains 10-100 eggs, mostly about 30 eggs, oblique 2 longitudinal rows. Nymph 5-6 instars, few 7 instars. The 1st instar is greyish green, the head is large and high, without wing bud, and the antenna is 13 nodes; the 2nd instar is green, the black-brown longitudinal stripes on the head and chest begin to appear, and the antenna is 14 - 17 nodes; the 3rd instar is light green, the black-brown longitudinal stripes on both sides of the head and chest are obvious, and the pale middle band is obvious along the dorsal midline; the antenna is 18-19 nodes, and the wing bud is slightly exposed; the 4th instar wing bud is triangular, and the length does not reach the first node of the abdomen, and the antenna is 20 - 22 nodes; the last instar wing bud exceeds the third node of the abdomen, and the antenna is 23-29 nodes.

Living habits Zhejiang, Hunan, north of the annual 1 generation, south of 2 generations, all parts of the ridge, wasteland, dam and other soil 1.5-4cm deep or weeds rhizosphere, rice stubble plants in winter. The overwintering eggs hatch in Guangzhou from late March to early April, Nanchang in the first and middle of May, Hanchuan in Hubei in the middle and late May, Beijing in the first ten days of June, Gongzhuling in Jilin Province in the first and middle of July; Guangzhou emerges in the first and middle of June, Nanchang in the first and middle of July, Hanchuan in the middle and late July, Beijing in the first and middle of August, Gongzhuling emerges in the middle and late August. The adults of the second generation in the second generation area mostly emerged in September, which was basically the same in all places. The adult life span is 59-113 days, the pre-oviposition period is 25-65 days, the egg stage of the first generation area is 6 months, the first generation of the second generation area is 3-5 months, the second generation is nearly 1 month, the nymph stage is 42-55 days, and the elder is 80 days. It likes to emerge in the morning, and begins to mate 15-45 days after emergence. It can mate many times in its life. It has the habit of beating lights when it is hot at night. The eggs are laid in blocks under the soil, mostly on the ridge, with 1-3 eggs per female. The newly hatched nymph feeds on weeds first, and spreads to harm English white, rice or beans after the third instar. Natural enemies are flies, mantis, frogs, spiders, birds.

Control methods (1) Rice locust likes to lay eggs in fields, fields and ditches. In areas where locusts are severely affected, human resources should be organized to shovel and turn over ridges to kill locust eggs, which has obvious effect. (2)Protect frogs and toads, effectively inhibit the occurrence of this insect. (3)Grasp the characteristics of eating young leaves of weeds by the ridge, edge and ditch of rice locust before 3 years old, and carry out sudden control. When entering 3-4 years old, it is often transferred to the field. When there are more than 10 insects in 100 plants, 50% phoxim emulsifiable concentrate or 50% malathion emulsifiable concentrate or 20% fenvalerate emulsifiable concentrate, 2.5% cyhalothrin emulsifiable concentrate 2000-3000 times, 40% dimethoate emulsifiable concentrate 1000 times, 2.5% cypermethrin emulsifiable concentrate 1000-2000 times. Good control effect can be obtained. (4)Aircraft should be used to prevent and control large areas.