Rice leaf roller
The scientific name is Cnaphalocrocis medinalis Guenee, Lepidoptera. Alias ​​scraped. Distribution from the north of Heilongjiang, Inner Mongolia, south to Taiwan, Hainan, the country's rice areas.
The host is mainly responsible for rice, and sometimes it damages wheat, sugarcane, millet, and grass weeds.
The traits of the larvae are larvae, and the larvae entangle the filaments into the adult leafhoppers of rice leaves, where the larvae hide and eat the leaf flesh, leaving only the epidermis to form white streaks, resulting in a reduction in the 1000-grain weight of the rice and an increase in the pods, which causes a reduction in yield.
Morphological characteristics Female adult moths 8-9mm long, wingspan 17mm, body, yellow cheeks, dark brown front wings, the outer edge of a dark brown wide band, the inner horizontal line, the outer horizontal line obliquely cross the wing surface, the middle horizontal line Short, the hind wings also have 2 horizontal lines, the internal horizontal lines are short and do not reach the trailing edge. The male moth is slightly smaller and has a brighter color. The front and rear wing markings are similar to the female moths, but the front edge of the front wing has a black eye pattern. Eggs 1mm long, nearly elliptic, flat, slightly raised in the middle, the surface with fine mesh, early white, after the gradual light yellow. The larvae are 5-7 years old and most are 5 years old. The last instar larvae have a body length of 14-19mm, a brown head, a yellowish-green color to green, and an orange-red color at the time of ripening. There are 8 small black circles on the back and back of the chest, 6 in the front row, and 2 in the back row. - 10mm, cylindrical, tipped, with 8 hooks, light yellow, and later reddish-brown to brown.
Living habits are 1-2 years old in Northeast China, 5 to 6 generations in the middle and lower reaches of the Yangtze River to the north of Nanling, 10 to 11 years in the south of Hainan, wintering in the south of the Nanling and larvae in the south, and wintering in the north of the Nanling Mountains. The overwintering sites are grassy weeds such as Lee's oysters and Suiho's Brome in ratoon rice, rice piles and wetlands. The worm has long-distance migration habits. In the north of latitude 30 degrees north of China, no insects can overwinter. Every spring, adults come from the south to the north with the monsoon, and fall down with the air sinking and rain towing, becoming the initial insect source in non-wintering areas. In the fall, adults relocate with the monsoon to the south for breeding, wintering with larvae and cockroaches. For instance, in Anhui, the worm cannot overwinter. Every year from May to July, adults migrate from the south to become the initial insect source, which occurs in the paddy field for 4-5 generations. The larvae of all generations are endangered: the first generation of the first half of June; the second generation of 7
In the middle of the month; three generations in the middle of August; four generations in the middle of September; and five generations in the middle of October. Production on the 1st and 5th generation of insects is less, generally 2 and 3 generations are harmful. Adults inhabit the rice fields during the day and are disturbed when they fly, but they are not far off. They are active and mating at night. They lay their eggs on the front or back of the rice leaves, and the single seeds are mostly numerous, and a few 2-3 grains are bunched together. Adults have Phototaxis and the habit of tending to lay eggs in the green rice fields, likes to eat honeydew and nectar secreted by aphids. Egg period 3-6 days, larval period 15-26 days, a total of 5 instars, first-instar larvae do not scar; at the second age, climb to the tip of the leaf, spine squeezing leaf tip or near the tip of the leaf edge, that is " "Cutting period""; third instar larvae longitudinally roll the leaves, forming a distinct lumbosacral worm, that is, "blade stage"; after 3rd instar, the food intake increases, the worms inflate, enter the 4-5 years of frequent transfer damage, pests The broom is white and white, and the entire white rice paddy field is full. When the larvae are lively and stripped of pests and insects, they rapidly retreat or fall to the ground. The mature larvae climbed to the base of the rice grove, and the lobule was ineffective.
Or yellow leaves on the spine to form a close cockroach, the cockroaches within the cockroaches, cockroaches more at the leaf sheath or between the strains or surface dry leaf thin cocoon. Flea period 5-8, female moths 3-12 days before spawning, female moths live for 5-17 days, male moths for 4-16 days. The worm prefers warmth and high humidity. Temperature of 22-28 °C, relative humidity higher than 80% is conducive to adult ovary development, mating, spawning and egg hatching and the survival of newly hatched larvae. For this reason, from June to September, it was rainy, and there was a lot of humidity. The irrigation in the fields was too deep, and the application of nitrogen fertilizer was too late or too much, causing rice to grow long and seriously. Among the major natural enemies, there are nearly one hundred kinds of Trichogramma, Trichogramma, and so on.
Prevention methods (1) Rational fertilization, strengthening of field management, promotion of robust rice growth, and reduction of victimization. (2) Artificial release of Trichogramma. In the period from the beginning to the peak of the spawning period of rice leaffolders, the bees were placed in batches in batches, and 30,000 to 40,000 heads per 667m2 were placed every 3 days, and beelets were continuously released 3 times. (3) spraying Bacillus, Bacillus, per 667m2 spray per gram of bacteria containing 100 million in the amount of spore powder 150 to 200g, 60 to 75kg of water, dubbed 300 to 400 times liquid spray. In order to improve the biological control effect, a liquid detergent 0.1% detergent can be added as a wetting agent. In addition, if you can add 1/5 of the amount of liquid to kill lice better. (4) When the larvae at the age of 2 or 3, or at the age of more than 15 new clusters of leaf bracts, spray 80% insecticidal powder 35-40g per 42m2 or 42% triclopricin 60ml or 90% crystal enemy 100% 600 times liquid, but also splash
Pour 50% of acacia pine EC 100ml water 400kg. Promote the use of 5% Ruijin special glue suspension, 20ml per 667m2 medication spraying effect on water. For every 667m2, use 10% imidacloprid wettable powder 10-30g, water 60kg, l 30 days to prevent more than 90% of the effect, the effective period of 30 days. In addition, it can also be used in the peak period of 2-3 instar larvae, with 10% imidacloprid 10-20g/667m2 and 80% insecticide single 40g/667m2 mixed with the main anti-rice leaf roller, and rice planthoppers.
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