Trends and control opinions of four generations of Spodoptera litura and Spodoptera exigua
According to the monitoring survey of some vegetable pests and surveillance sites, since late August, the adults of the night moth pests in the vegetable producing areas of Jiangsu Province have a long period of growth and high moths, and some eggs in the fields of vegetables, soybeans, peanuts, and taro are large. Combined with the comprehensive analysis of weather conditions, it is expected that the four generations of Spodoptera litura will occur more heavily, and local areas will occur more frequently; beet armyworms occur moderately and locally. All localities should effectively monitor the situation of pests, strengthen the guidance of prevention and control techniques, organize prevention and control in a timely manner, effectively control the hazards, and ensure the normal growth and quality of crops such as vegetables, soybeans and peanuts in autumn. Occurrence 1 Spodoptera litura The recent increase in moths has been faster. Tongzhou sexual attractant monitoring, from August 1st to September 4th, the cumulative moth was 1,594, the moth was higher than 2015, lower than the same period of 2016 (754.7 in 2015, 5,471.7 in 2016); respectively On March 26th, August 29th to 30th, and September 3-4th, there were three obvious moth peaks. The number of moths was the highest on September 3-4, and the average lure was 209.7. Suining from August 21st to September 5th, accumulated a single lure to attract 66 moths, a small moth peak appeared on September 4, and the peak moth was 18 heads. For example, from August 25 to September 3, sexual attractants accumulate 4,023.25 moths, which is higher than the same period of last year (1,139 heads); moth peaks appeared from August 28 to September 1, and the average lure of the single lure was 2,325.75. head. From August 5th to September 4th, Fengxian County has accumulated 305 moths, and there are moth peaks from August 30th to September 3rd. The peak moths are 153. On August 31, the total amount of moths in Suzhou was 3,129.9, which was significantly lower than that in the past three years (10,019.8 in 2016; 8,616.2 in 2015; 4,960.65 in 2014). Rudong peaked on August 29th, with a total of 213 heads (estuaries) and 133 heads (苴镇). The amount of eggs in the field is high. According to the systematic investigation of the Ganlantian system in Suzhou City, the average number of eggs per plant on August 30 was 63.26 pieces, which was lower than the same period of last year (161.75 pieces). Tongzhou Cabbage Field System Survey, on August 28th and September 1st, there were obvious peaks of spawning in the field (10 new eggs and 15 pieces of eggs on the same day), and on September 4th, the cumulative number of eggs in the field was 30. Block; on September 4, 6 pieces of oyster field were surveyed, with an average of 100 eggs (0-15), with an average of 11.7 (0-35) heads; and 4 cases of cabbage after investigation, with an average of 100 eggs. The amount of 5 (0 ~ 12) blocks, the average number of insects 23 (0 ~ 84) head; soybean field 100 eggs, 2 eggs, 94 insects. Rudong system to check eggs, reached the peak on August 31, a hundred eggs and 8 eggs. On September 5, 10 broccoli fields were investigated, with an egg field rate of 40%, an average of 100 eggs (0 to 6), a worm field rate of 40%, and an average of 3.4 (0 to 20) heads. Dafeng investigated on September 3, the number of insects in the cabbage seedling stage was 22.2; the number of soybeans was 18.9. Pukou District census 7 soybeans from August 30 to 31, with an average of 187 insects. For example, on September 4, the investigation of Shantoutian, the number of eggs in a hundred plants was 14.2; the number of eggs in a soybean field was one. On September 5, Changshu surveyed 16 fields of cauliflower, and the number of 100 strains of insects was 0, with an average of 1.1 eggs (0-8). 2 beet armyworm Tongzhou sexual attractant monitoring, from August 1st to September 4th, accumulated a total of 410.67 moths, the moth amount was higher than 2015, slightly lower than the same period of 2016 (172.3 in 2015, 435.7 in 2016), respectively There were two peaks on the 19th to 21st and August 29th, and there were more moths on August 19th and 21st, and 66 moths in the peak period. For example, from August 25 to September 3, the cumulative moth was 120.25, which was higher than the same period of last year (83.5); the moth peak appeared from August 28 to September 1, and the peak moth was 79.25. Suining from August 21st to September 5th, accumulated a total of 66 moths; on September 4th, there was a moth peak, and the peak moth was 18 heads. In Luzhou, from August 15 to 29, the cumulative amount of moths under the lamp was 1,185. Fengxian County from August 6th to September 4th, a single lure of a lure attracting 448 moths, the peak of moth appeared on August 8-9, a small peak appeared on September 1-3, and the peak moth was 40. . Rudong has always had no obvious moths. On September 5, Changshu surveyed 16 fields of cauliflower, with an average of 30.2 (0-250) heads, and an average of 1.3 eggs (0-10). Dafeng investigated on September 3, the number of insects in the cabbage seedling stage was 23.6; the number of soybeans in the soybean was 18.9. Rudong system to check the eggs, reached the peak on August 31, a hundred eggs and 7 eggs. On September 5, 10 broccoli fields were investigated, with an egg field rate of 20%, an average of 100 eggs (0.4-4), a worm field rate of 60%, and a worm strain of 13 (0-56) heads. Tongzhou cabbage field system survey, on August 24, see eggs, 100 eggs, 5 eggs, on August 30, 100 eggs, 5 eggs, a total of 10 eggs. On August 29th to 30th, the average number of insects on the cowpea was 27.5 (0-50); the average number of eggs in the flowering field was 5 (0-10), and the average number of insects was 22.5 (10-40). . Jiangning District investigated the cabbage on August 30. The average number of insects was 2.5 (0 to 18), and the average number of insects in the amaranth was 0.5 (0 to 10). In Pukou District, 7 soybean fields were surveyed from August 30 to 31, and the beet armyworm larvae in the field were sporadic. According to the systematic investigation of the Ganlantian in Suzhou City, the average number of eggs per 100 eggs on August 30 was 84.33 pieces, which was higher than last year (39.6 blocks). Yandu investigated the 12 sheds of green vegetables on August 29, and the number of insects was 19.6 (0-48). The investigation was carried out on 5 pieces of spinach, and the number of insects was 116.8 (8-315). 42.8 (0 ~ 118) head; investigated 4 peanuts, the amount of 100 insects 12.4 (0 ~ 52) head. On August 30th, Dongtai census 14 cauliflowers, see the egg field rate of 35.7%, the average number of eggs per egg 2.1 (0 ~ 10), see the insect field rate of 50%, the average hundred insects 11.8 (0 ~ 80) head. On August 30, Zhangzhou investigated 50 soybean fields, the rate of insects was 100%, and the average number of insects was 51.8 (34-122). Prevention opinion Spodoptera litura and Spodoptera exigua are important pests in the production of various crops in autumn, such as vegetables, soybeans and peanuts in Jiangsu Province. They have a wide range of hosts, miscellaneous foods and many types of crops. In the middle of September, it will enter the peak period of the young larvae of the two species of noctuids. It is a favorable period for prevention and control. After the control period is over, the older larvae have strong resistance and are difficult to control. According to the insect situation, all localities should organize timely prevention and control of high-worm fields such as cruciferous vegetables, taro, beans and peanuts: (1) trapping adults. Use sex attractants and insecticidal lamps to trap adults. (2) Agricultural control. According to the characteristics of the newly hatched larvae cluster, combined with the farming operation, timely remove the eggs of the initial hatching, pinch the egg mass and the wormhole, and reduce the number of pests in the field. (3) Chemical control. At the peak of egg hatching to the larval stage of 1st to 2nd instar larvae, the drug is administered once every 5 to 7 days. The control agent can be selected from Bacillus brevis, Bacillus thuringiensis, Spodoptera litura nuclear polyhedrosis virus, and Spodoptera exigua. Phytovirus, chlorantraniliprole, chlorfenapyr, tebufenozide, indoxacarb and the like. (4) Notes 1 Nocturnal moth larvae have the habit of nocturnal nighttime. It is advisable to spray in the evening. Spray the front and back of the blade when spraying, and spray the ground near the rhizosphere of the plant to prevent it from rolling off the ground or drilling. The larvae on the surface of the soil are leaked. 2 Note that the agents are used interchangeably to prevent pests from developing resistance. 3 It is strictly forbidden to use the banned pesticides and strictly follow the pesticide safety interval. 4 The sericulture area should pay attention to the protection of silkworms to ensure that no poisoning accidents occur. More pesticide knowledge , please pay attention to China Pesticide Network (Source: Jiangsu Plant Protection Plant Quarantine Station) The mechanical concealed cistern is a common bathroom fixture that stores flush water and controls flushing. 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