2020年我国北方地区草地螟种群的时空动态与虫源分析

doi:10.3864/j.issn.0578-1752.2022.05.006

Abstract

Abstract:

【Objective】To provide supports for improving the monitoring and warning level of the beet webworm, Loxostege sticticalis, the seasonal spatiotemporal distribution in Northern China, the sources and relationship between L. sticticalis in North and Northeast China, within and outside China were studied in 2020. 【Method】The searchlight traps were assembled to daily monitoring in Beijing, Tianjin, Hebei, Liaoning, Shanxi and Inner Mongolia. Based on the monitoring data of searchlight traps at the plant protection stations in the 6 provinces (municipality, Autonomous Region), the population fluctuations and migration pattern of L. sticticalis in Northern China were analyzed by using GrADS and R. The FNL data were processed by GrADS software, to obtain wind field information and draw the map. A three-dimensional particle trajectory analysis program based on WRF model was used to simulate the migration route of L. sticticalis, and the trajectory simulation results were plotted by ggplot2 3.3.0 package of R3.8. 【Result】The overwintering generation of L. sticticalis adults mainly occurred in Shanxi, Hebei and Inner Mongolia, and a large number of adults of the 1st generation were found in Huade of Inner Mongolia and Kangbao of Hebei in 2020. During the typical migration period, North China and Northeast China were affected by frontal and cyclonic processes. The southward or southwest low-level jet at the front of the northeast cyclone provided favorable conditions for the long-distance migration of L. sticticalis into the northeast region, but the northwest airflow at the back of it blocked the migration path. The results showed that most of the overwintering adults stayed in North China and some of them migrated to Northeast China and the border of China, Mongolia and Russia with the help of southwest airflow. In late May, the main source in Hinggan League of Inner Mongolia came from the overwintering area of L. sticticalis in North China. In early June, part of them came from the overwintering area of North China, part of them came from the junction of China, Mongolia and Russia. In late June, the main source came from North China. The adults of the 1st generation of L. sticticalis mainly came from the 1st generation larva occurrence areas in central and western Inner Mongolia and the border between China and Mongolia. Affected by the frontal weather, they gathered and landed in Huade of Inner Mongolia and Kangbao of Hebei, and further migrated to the northeast. 【Conclusion】2020 is a typical year of outbreak since the population of L. sticticalis has risen again in 2018. Strong air currents are important reasons for its successful migration, the convergence of wind shear and cyclone center causes the migrating adults to gather and land in large area, resulting in a sudden increase of local insect population. Both the overwintering generation and the 1st generation of L. sticticalis in North China and Northeast China were closely related to the foreign sources. It is of great significance to carry out the regional monitoring and prediction and forecasting in advance for L. sticticalis.

Key words: Loxostege sticticalis, migration, spatiotemporal dynamics, source

CHEN ZhiYong, ZHANG Zhi, LIU Jie, KANG AiGuo, ZHAO SuMei, YIN XiangJie, LI ZhanQing, XIE AiTing, ZHANG YunHui. Spatiotemporal Dynamics and Source of Loxostege sticticalis in Northern China in 2020[J].Scientia Agricultura Sinica, 2022, 55(5): 907-919.

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References 39

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地点 Site	位置 Location	高峰日 Peak day (m-d)	高峰日灯诱蛾量 Number of L. sticticalis in light-trap at peak day	高峰期 Peak stage (m-d—m-d)	卵巢发育级别 Ovarian development grade
额尔古纳市Ergun City	120.18°E, 50.24°N	06-08	2000	-	-
乌兰浩特市Ulanhot City	122.09°E, 46.07°N	06-21	17334	-	Ⅲ (80%)
乌拉特后旗Urad Rear Banner	107.07°E, 41.08°N	06-19	265742	-	Ⅱ (90%)
围场县Weichang County	117.75°E, 41.93°N	06-17, 06-18	10000	06-17—06-20	-
太仆寺旗Taibus Banner	115.28°E, 41.88°N	06-24	40123	06-16—06-28	-
巴彦淖尔市Bayannur City	107.36°E, 40.75°N	06-18	23769	06-18—06-19	Ⅱ-Ⅲ (100%)
土默特右旗Tumd Right Banner	110.52°E, 40.57°N	06-19	20000	06-19—06-20	Ⅲ (72%)
乌拉特前旗Uard Front Banner	108.65°E, 40.74°N	06-20	6113	06-19—06-20	Ⅰ-Ⅲ (85%)
达拉特旗Dalad Banner	110.03°E, 40.41°N	06-18, 06-19	9000	06-18—06-20	Ⅱ (90%)
杭锦后旗Hanggin Rear Banner	107.15°E, 40.89°N	06-19	6270	06-19—06-20	Ⅰ-Ⅱ (90%)

Spatiotemporal Dynamics and Source of Loxostege sticticalis in Northern China in 2020

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