The aim of the research was to connect two methods of the chemical control.The first chemical treatments were applied according to the signalling method.The second method was applied according to the phonological crit...The aim of the research was to connect two methods of the chemical control.The first chemical treatments were applied according to the signalling method.The second method was applied according to the phonological criterion i.e.,on the basis of the values of effective temperatures sums or heat sums for cutworms.The studies on cutworms infesting sugar beet crops were carried out in the years 2005-2008.The observation performed during the moth flights from May to September included two species,turnip moth(Agrotis segetum Den.&Schiff.)and heart-and-dart moth(A.exclamationis L.).The dynamics of moth flights was recorded in reference to readings of climatic conditions registered with the field meteorological stations set up near the light traps.Observations on cutworm occurrence during the vegetation season were done every 5-7 days.Moreover,additional studies were conducted under control conditions in the growth chambers at three programmed temperatures(17°C,20°C,24°C)and relative humidity(50%-70%).Based on the results the values for the heat sum of 501.1°C and effective temperatures sum of 230.0°C were determined for the developmental stages of cutworm.On the base of the results obtained it can be stated that the improved method of short-term forecasting can be an alternative solution in the integrated protection management against pest.展开更多
[ Objective ] The paper was to study the occurrence and damage regularity of tobacco cutworm moth （Spodoptera Litura Fabricius） in low-altitude area in Lincang city. [ Method] The adult sex attractant monitoring, fi...[ Objective ] The paper was to study the occurrence and damage regularity of tobacco cutworm moth （Spodoptera Litura Fabricius） in low-altitude area in Lincang city. [ Method] The adult sex attractant monitoring, field investigation of occurrence and damage, and observation of continuous generation development of natural populations were carried out in natural flue-cured tobacco fields. [ Result] In field growth period of flue-cured tobacco under low-altitude of 1 000 - 1300 m, tobacco cutworm moth occurred for 4 generations, the duration of each generation was about 33 d, and the main injurious generation was the third generation. [ Conclusion] The paper provided reference for comprehensive control of tobacco cutworm moth in the low altitude areas.展开更多
[Objective] The paper was to predict the occurrence trend of Spodoptera litura in Chenzhou area in 2010. [Method] With filed survey data for continuous years in Chenzhou and Ningyuan areas in Hunan Province as basic d...[Objective] The paper was to predict the occurrence trend of Spodoptera litura in Chenzhou area in 2010. [Method] With filed survey data for continuous years in Chenzhou and Ningyuan areas in Hunan Province as basic data, combining with local meteorological data, the occurrence law of S. litura in Chenzhou area in 2010 was predicted in the paper. [Result] With Chenzhou as an example, the occurrence quantity of S. litura during April and June in 2010 was only second to 2002 and 2003, which was higher than other years, indicating that 2010 would be the year with moderate and slightly heavier occurrence of S. litura. The occurrence quantity of S. litura during April and June was predicted by using temperature in January, and the correlation coefficient was significant, reaching the reliability degree of 90%. The occurrence quantity of S. litura during April and June was predicted by using sexually trapped moth during February and March, the correlation between them was very high, reaching the reliability degree of 98%. The sexually trapped moth of S. litura during April and June was predicted using sexually trapped moth by black cutworm （Agrotis ypsilon） during February and April, and the correlation coefficient between them reached the reliability degree of 90%. [Conclusion] The study provided reference for integrated control of S. litura.展开更多
Chlorfluazuron is an insect growth regulator for controlling the major insect pests in crops. This paper describes the effects of sublethal doses （LD10：1.00 ng/larva; LD30：3.75 ng/larva） of chlorfluazuron on ovari...Chlorfluazuron is an insect growth regulator for controlling the major insect pests in crops. This paper describes the effects of sublethal doses （LD10：1.00 ng/larva; LD30：3.75 ng/larva） of chlorfluazuron on ovarioles during ovarian development and oogenesis of common cutworm, Spodoptera litura （F.）. It is a significant pest of cotton, tobacco and miscellaneous vegetables. The LDlo or LD3o was applied topically to the newly-ecdysed fifth-instars of S. litura under laboratory conditions. In controls, on 2nd day of adult emergence, the cell density in germarium was 1636 ± 9.17 nuclei/mm^2. It increased until 3rd day, i.e., 1829 ± 8.87 nuclei/mm^2 and decreased thereafter. In the LDloor LD-3o-treated insects, the patterns of the cell density was the same as in controls but values were significantly （P 〈 0.05） decreased in the LD10- and more in the LDa0-treated females compared with controls. In control, ovaries were normal type and had mature ova with an occasional one or two being absorbed. In LD10-treated females, ovaries had spaces in ovarioles and absorption of ova. In LD30-treated females, besides the spacing and absorption, sometimes only immature （germarium） ova were found.展开更多
文摘The aim of the research was to connect two methods of the chemical control.The first chemical treatments were applied according to the signalling method.The second method was applied according to the phonological criterion i.e.,on the basis of the values of effective temperatures sums or heat sums for cutworms.The studies on cutworms infesting sugar beet crops were carried out in the years 2005-2008.The observation performed during the moth flights from May to September included two species,turnip moth(Agrotis segetum Den.&Schiff.)and heart-and-dart moth(A.exclamationis L.).The dynamics of moth flights was recorded in reference to readings of climatic conditions registered with the field meteorological stations set up near the light traps.Observations on cutworm occurrence during the vegetation season were done every 5-7 days.Moreover,additional studies were conducted under control conditions in the growth chambers at three programmed temperatures(17°C,20°C,24°C)and relative humidity(50%-70%).Based on the results the values for the heat sum of 501.1°C and effective temperatures sum of 230.0°C were determined for the developmental stages of cutworm.On the base of the results obtained it can be stated that the improved method of short-term forecasting can be an alternative solution in the integrated protection management against pest.
基金Supported by Project of China National Tobacco Corporation Yunnan Branch( 2010YN77)
文摘[ Objective ] The paper was to study the occurrence and damage regularity of tobacco cutworm moth （Spodoptera Litura Fabricius） in low-altitude area in Lincang city. [ Method] The adult sex attractant monitoring, field investigation of occurrence and damage, and observation of continuous generation development of natural populations were carried out in natural flue-cured tobacco fields. [ Result] In field growth period of flue-cured tobacco under low-altitude of 1 000 - 1300 m, tobacco cutworm moth occurred for 4 generations, the duration of each generation was about 33 d, and the main injurious generation was the third generation. [ Conclusion] The paper provided reference for comprehensive control of tobacco cutworm moth in the low altitude areas.
基金Supported by Short-Flat-Fast Project of Meteorological Bureau of Hunan Province
文摘[Objective] The paper was to predict the occurrence trend of Spodoptera litura in Chenzhou area in 2010. [Method] With filed survey data for continuous years in Chenzhou and Ningyuan areas in Hunan Province as basic data, combining with local meteorological data, the occurrence law of S. litura in Chenzhou area in 2010 was predicted in the paper. [Result] With Chenzhou as an example, the occurrence quantity of S. litura during April and June in 2010 was only second to 2002 and 2003, which was higher than other years, indicating that 2010 would be the year with moderate and slightly heavier occurrence of S. litura. The occurrence quantity of S. litura during April and June was predicted by using temperature in January, and the correlation coefficient was significant, reaching the reliability degree of 90%. The occurrence quantity of S. litura during April and June was predicted by using sexually trapped moth during February and March, the correlation between them was very high, reaching the reliability degree of 98%. The sexually trapped moth of S. litura during April and June was predicted using sexually trapped moth by black cutworm （Agrotis ypsilon） during February and April, and the correlation coefficient between them reached the reliability degree of 90%. [Conclusion] The study provided reference for integrated control of S. litura.
文摘Chlorfluazuron is an insect growth regulator for controlling the major insect pests in crops. This paper describes the effects of sublethal doses （LD10：1.00 ng/larva; LD30：3.75 ng/larva） of chlorfluazuron on ovarioles during ovarian development and oogenesis of common cutworm, Spodoptera litura （F.）. It is a significant pest of cotton, tobacco and miscellaneous vegetables. The LDlo or LD3o was applied topically to the newly-ecdysed fifth-instars of S. litura under laboratory conditions. In controls, on 2nd day of adult emergence, the cell density in germarium was 1636 ± 9.17 nuclei/mm^2. It increased until 3rd day, i.e., 1829 ± 8.87 nuclei/mm^2 and decreased thereafter. In the LDloor LD-3o-treated insects, the patterns of the cell density was the same as in controls but values were significantly （P 〈 0.05） decreased in the LD10- and more in the LDa0-treated females compared with controls. In control, ovaries were normal type and had mature ova with an occasional one or two being absorbed. In LD10-treated females, ovaries had spaces in ovarioles and absorption of ova. In LD30-treated females, besides the spacing and absorption, sometimes only immature （germarium） ova were found.
