Rice Ridged Rice Butterfly

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The scientific name Parnara guttata Bremer et Grey is Lepidoptera, Heteroidea. Alias, rice, butterfly, rice, rice, rice worms. Except in Xinjiang and Ningxia, there are no reports, but widely spread all over the country;

Host rice, white rice, corn, sorghum, barley, millet, bamboo, reed, white wax, alfalfa, setaria and so on.

Characteristics of the larvae After hatching, the larvae climb to the edge of the leaves or the tip of the leaves to conjugate the leaves to form a cylindrical rollworm, which is potentially damaging.

Morphological characteristics Adult body length 17-19mm, wingspan 28-40mm, dark brown body and wings, head and chest width wider than the abdomen, slightly green. The front wings have 7-8 translucent white spots arranged in a semi-circular shape with a large one below. There are four white transparent spots in the middle of the hind wings, arranged in a straight line or nearly straight line. The wing has a light face with the same markings as the front face. Egg brown, hemispherical, diameter 0.9mm, grayish green at first, followed by rosacea, top corolla with 8-12 petals. The last-instar larvae are 27-28mm in length, with brownish-yellow heads. The center of the head has a "mountain"-shaped brown pattern on the center of the head. The body is yellow-green, with a dark green dorsal line and a brownish-brown plate. It is light yellow, 22-25mm long, nearly cylindrical, with a flat tip.

Living habits 2 generations north of the Great Wall, 3 generations north of the Yellow River north of the Great Wall, 4-5 generations north of the Yangtze River to the south of the Yellow River, 5-6 years north of the Nanling Mountains to the south of the Yangtze River, and 6-8 years to the south of the Nanling Mountains. . In the same area, the altitude is different and the generations are different. In the south, larvae of middle and small larvae overwinter overwintered on fields such as ridges, canals, ditches, saplings, and bamboo groves. The temperature is higher than 12°C and can be fed. The first generation occurs mainly in 茭.

In the past, the later generations are mainly on rice. The starting temperature for each development of the worms was 12.6°C for eggs, 9.3°C for larvae, and 14.9°C for larvae. Temperature 15-16°C, egg period 15-16 days, 21

A 26 °C 5 days. The larval period is 26-28°C, 18-20 days, less than 24°C, and higher than 30°C for 21 days. The overwintering larvae last for 180 days. In the pupal period of 7-16 days, the adult lives for 2-19 days. Adults grow up overnight, emerge early in the morning and spawn in eggs. Newly hatched larvae first bite on the egg shells, climb to the tips of the leaves or leaves, and feed on the leaves and knots, crawling to the outside in the early morning or early evening, and falling into the water. At the time, the larvae migrated to the old leaves of the lower part of the plant, and then moved upwards after irrigation, and the last-instar larvae were more likely to be strewed and metamorphosed. The temperature in winter and spring is low or the rainfall in the previous month is heavy, and rain is more popular.

Control methods (1) Use larvae to inactivate larvae by using artificial insemination. (2) Protection of natural enemies such as parasitic bees and blue dragonflies. (3) If necessary, spray 50% phoxim EC 1500 times or 25% EKC 1500 times, 2.5% chlorinated EC 2000 times, 10% Imidacloprid WP 1500 times, 35 SF 2 Emulsion 1000 times liquid, 667m2 spray good liquid 70L, once every 10 days, control 1 or 2 times.

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