黑竹缘蝽是绿竹等丛生竹笋期的主要害虫,为拓宽防治黑竹缘蝽新途径,制定高效、经济、环保的防治措施,研究了5种植物源杀虫剂对黑竹缘蝽若虫的防治效果。结果表明:选用1.3%苦参碱可溶液剂、0.5%藜芦碱可溶性液剂、4%鱼藤酮乳油、1.2%烟...黑竹缘蝽是绿竹等丛生竹笋期的主要害虫,为拓宽防治黑竹缘蝽新途径,制定高效、经济、环保的防治措施,研究了5种植物源杀虫剂对黑竹缘蝽若虫的防治效果。结果表明:选用1.3%苦参碱可溶液剂、0.5%藜芦碱可溶性液剂、4%鱼藤酮乳油、1.2%烟碱苦参碱乳油、1%苦皮藤素乳油,运用弥雾机喷雾防治黑竹缘蝽若虫,药剂原药用量均为1 200 m L/hm2,药后3 d防治效果均可达90%以上,达到了有效控灾的目的。这5种药剂可用于无公害防治黑竹缘蝽若虫,试验结果可为生产上制定黑竹缘蝽若虫防治措施提供借鉴。展开更多
Aeschnidiid nymphs are here first identified and described, and its phylogenetic relationship and bioecological characteristics are deduced. The nymphs known from China, Mongolia, Russia and Brazil and arranged in the...Aeschnidiid nymphs are here first identified and described, and its phylogenetic relationship and bioecological characteristics are deduced. The nymphs known from China, Mongolia, Russia and Brazil and arranged in the family Aeschnidiidae are, in fact, unrelated to this group. All the known five Chinese species in four genera which were erected based on fossil nymphs and placed in the family Gomphidae may be transferred in Aeschnidiidae and merged into one alone, the Sinaeschnidia cancellosa. It is a geographically widespread species from the 'Jehol biota' of East Asia and appeared in the latest Late Jurassic age.展开更多
We used brightfield electron microscopy （BEM）, differential interference contrast microscopy （DICM）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and confocal laser scanning micr...We used brightfield electron microscopy （BEM）, differential interference contrast microscopy （DICM）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and confocal laser scanning microscopy （CLSM） to investigate the stylet pathways of Bemisia tabaci during nymphal feeding behavior in cotton leaves beginning with penetration of the abaxial leaf surface and ending with stylets in sieve tubes in phloem tissues. Most nymphal stylets within salivary sheaths penetrating leaf tissues made complex turns and developed more than one salivary sheath branch before ending in sieve tubes. The external morphology of the salivary sheaths and their routes between and through leaf cells are described during the present study. Results showed the presence of the stylet within the sieve tubes. B. tabaci nymphs may remove stylets and feed in different sieve tubes. Ten short movies showing the progression of the stylet penetrations from adaxial surface to the sieve tubes are attached to Figures 8-15. The report and movies can be viewed from the internet. Download the movies to a local drive in your computer first for fast upload. The movies are posted on the website http：//www.ars.usda.gov/Services/docs.htm？docid=14629. The movies can be used as a teaching aid in biology classes.展开更多
This research presents new information on the biology ofKermes quercus （L.）. Observations were carried out in 2009 in the city of Warsaw and surroundings （Poland）. Material was collected on Quet;cus robur L. betwe...This research presents new information on the biology ofKermes quercus （L.）. Observations were carried out in 2009 in the city of Warsaw and surroundings （Poland）. Material was collected on Quet;cus robur L. between the end of January until the beginning of November. The sampling each month was divided into three ten-day periods： I - from the 1st till 10th day of the month, II - from ! lth till 20th day of the month, and Ill - from 21st till 30th day of the month. The material was sampled at least once in each period. All live specimens of K. quercus were picked off and the developmental stages were identified. The observations revealed that, almost exclusively lst-instar nymphs occurred during the winter and they remained in this stage throughout the spring and summer until the last third of August. The process of moulting from 1st instar to 2nd instars started in the last third of August and lasted about 2 weeks. In autumn the 2nd-instars nymphs entered the winter diapause. The results suggest that, under the climatic conditions of Poland, Kermes quercus L. is not a univoltine species. Each generation probably develops through two years - in the first year overwintering as the lst-instar nymphs and in the second year as the 2nd-instar nymphs.展开更多
文摘黑竹缘蝽是绿竹等丛生竹笋期的主要害虫,为拓宽防治黑竹缘蝽新途径,制定高效、经济、环保的防治措施,研究了5种植物源杀虫剂对黑竹缘蝽若虫的防治效果。结果表明:选用1.3%苦参碱可溶液剂、0.5%藜芦碱可溶性液剂、4%鱼藤酮乳油、1.2%烟碱苦参碱乳油、1%苦皮藤素乳油,运用弥雾机喷雾防治黑竹缘蝽若虫,药剂原药用量均为1 200 m L/hm2,药后3 d防治效果均可达90%以上,达到了有效控灾的目的。这5种药剂可用于无公害防治黑竹缘蝽若虫,试验结果可为生产上制定黑竹缘蝽若虫防治措施提供借鉴。
文摘Aeschnidiid nymphs are here first identified and described, and its phylogenetic relationship and bioecological characteristics are deduced. The nymphs known from China, Mongolia, Russia and Brazil and arranged in the family Aeschnidiidae are, in fact, unrelated to this group. All the known five Chinese species in four genera which were erected based on fossil nymphs and placed in the family Gomphidae may be transferred in Aeschnidiidae and merged into one alone, the Sinaeschnidia cancellosa. It is a geographically widespread species from the 'Jehol biota' of East Asia and appeared in the latest Late Jurassic age.
文摘We used brightfield electron microscopy （BEM）, differential interference contrast microscopy （DICM）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and confocal laser scanning microscopy （CLSM） to investigate the stylet pathways of Bemisia tabaci during nymphal feeding behavior in cotton leaves beginning with penetration of the abaxial leaf surface and ending with stylets in sieve tubes in phloem tissues. Most nymphal stylets within salivary sheaths penetrating leaf tissues made complex turns and developed more than one salivary sheath branch before ending in sieve tubes. The external morphology of the salivary sheaths and their routes between and through leaf cells are described during the present study. Results showed the presence of the stylet within the sieve tubes. B. tabaci nymphs may remove stylets and feed in different sieve tubes. Ten short movies showing the progression of the stylet penetrations from adaxial surface to the sieve tubes are attached to Figures 8-15. The report and movies can be viewed from the internet. Download the movies to a local drive in your computer first for fast upload. The movies are posted on the website http：//www.ars.usda.gov/Services/docs.htm？docid=14629. The movies can be used as a teaching aid in biology classes.
文摘This research presents new information on the biology ofKermes quercus （L.）. Observations were carried out in 2009 in the city of Warsaw and surroundings （Poland）. Material was collected on Quet;cus robur L. between the end of January until the beginning of November. The sampling each month was divided into three ten-day periods： I - from the 1st till 10th day of the month, II - from ! lth till 20th day of the month, and Ill - from 21st till 30th day of the month. The material was sampled at least once in each period. All live specimens of K. quercus were picked off and the developmental stages were identified. The observations revealed that, almost exclusively lst-instar nymphs occurred during the winter and they remained in this stage throughout the spring and summer until the last third of August. The process of moulting from 1st instar to 2nd instars started in the last third of August and lasted about 2 weeks. In autumn the 2nd-instars nymphs entered the winter diapause. The results suggest that, under the climatic conditions of Poland, Kermes quercus L. is not a univoltine species. Each generation probably develops through two years - in the first year overwintering as the lst-instar nymphs and in the second year as the 2nd-instar nymphs.
