Scientific name: Sesamia inferens (Walker) Lepidoptera, Noctuidae. Alias: Spodoptera exigua, Aster. Located in Shaanxi, Henan south of the rice area.
Host rice, corn, sorghum, wheat, millet, sugar cane, reeds, rape, white, and so on.
The characteristics of the damage are basically the same as those of II. Infestation of larvae into rice stems can also result in shoots, dead heart seedlings, dry booties, white spikes, and insect-infested plants. Large boreholes are harmful to insects. There are a large number of insect excretions outside the stems and they are different from the second one. The dead seedlings caused by the infestation of the giant salamander have many boreholes and insect feces, and most of them are not in the rice stems. They are mostly sandwiched between leaf sheaths and stems. The leaves and sheath parts of the damaged rice stems turn yellow. There are a lot of dead heart-shaped seedlings caused by Daxie, and there are few in the middle of the field, which is different from the dead heart seedlings caused by the insults of the stem borer and the stem borer.
Morphological characteristics Adult moth female body length 15mm, wingspan about 30mm, head, chest light brown, abdomen pale yellow to gray white; antennae filamentous, nearly rectangular fins, light grayish brown, the middle with 4 small black spots arranged in a square. Male moth body length of about 12mm, wingspan 27mm, antennae dentate. Oval flat, grayish yellow after the first white, the surface with fine vertical lines and horizontal lines, gather or scattered, often arranged in 2-3 rows. The final instar larvae are about 30 mm in length and 4 brown-to-dark brown in length, for a total of 5-7 years of age. The stump is 13-18mm long, stout, red-brown, grayish white powder on the abdomen, and 3 hook spines on the hip spine.
Life habits Cloud, 2-3 years old on the plateau, 3-4 generations in Jiangsu and Zhejiang, 4th generation in Jiangxi, Hunan, Hubei, Sichuan, 4-5 generations in Fujian, Guangxi and Yunnan, and 6-8 in southern Guangdong generation. In temperate larvae
White and rice crops such as stalks or roots in the winter, Hunchun larvae began to phlegm at temperatures above 10°C, emerged at 15°C, overwintered adults laid their eggs in spring corn, or looked at Amakusa in the fields. The inside of the leaf sheath of the weeds such as Lee's clams, the larvae were hatched and then transferred to the adjacent side of the rice line and plucked into the leaf sheaths for feeding. Red-brown rust plaques were seen at the entrance. Before the third instar, a dozen or so heads were clustered together, and the inner sheath of the leaf sheath was eaten. After drilling into the heart, it caused dry heart. Dispersed after 3rd age, damage the rice field seedlings with 2-3 sides, 10-30cm from the surface of the hole, when the old mature leaves in the sheath. Adults fly weak, often inhabiting between plants, each female can lay eggs 240, the egg generation generation is 12 days, 2, 3 generations 5-6 days; larvae generation about 30 days, second generation 28 days, three generations 32 Days; the period of 10 - l 5 days. Winter in Southern Jiangsu occurs from mid-April to June
In the first half of the first generation, from late June to late July, the second generation from late July to mid-October; Ningbo overwintering occurs from early April to late May. The first generation from mid-June to late July, the second generation From early August to late, three generations from mid-September to mid-October; Changsha and Wuhan overwintering occurred from early April to mid-May; the first-generation larvae in Jiangsu and Zhejiang prospered in mid-to-late May, mainly injuring white, July The second-generation larvae and the third-generation larvae in late-August are mainly rice plants, which are harmful to alfalfa. In contrast to the rice planting areas, the insects transfer damage between the two hosts. In northern Zhejiang and Southern Jiangsu, in the single-season rice-planting white area, after the wintering generation has not yet been planted with rice after emergence, the damage is concentrated and white, especially the damage at the field side.
Prevention methods (1) The first generation was measured and reported. By checking the progress of the previous generation, the peak period of adult emergence and the first generation larval hatching peak period were predicted, and the appropriate control period was reported. (2) There are white areas in the winter or early spring Qi mud to remove stubble white stubble, eradicate the field weeds, eliminate overwintering locusts. (3) According to the tendentism, early planting of early rice, early hybrid rice, and rice production during the spawning period of giant salamanders is the focus of the prevention and control of rice plants from booting to heading or plant height. Prevention and control strategies, governance generation, focus on the prevention and control of paddy fields. When the dry-sheath rate reaches 5% or the dry seedlings are harmed during production, most of the larvae are in the stage of 1-2 years of age and sprayed in time.
18% insecticidal double water, 250ml per 667m2, 50-75kg water or 90% soluble powder of baicalin 150-200g or 50% carcindan emulsion 100ml water spray, 90% crystal trichlorfon is also available 1008 plus 40% Dimethoate 50ml sprayed on water. When the larvae are older than 3 years old, they can use 50% phospholipid 150ml per 667m2 to treat the water.
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