红松人工纯林3种梢斑螟成虫种群动态分析

【目的】梢斑螟是黑龙江省红松人工林的主要果梢害虫,研究了其成虫种群动态及未来种群变化趋势,为种群预测以及防治提供科学理论依据。【方法】在梢斑螟成虫发生期6月下旬—8月初,每天夜间19:00—23:00在红松林缘利用灯光诱捕梢斑螟成虫,结合幼虫鉴定种类,分析其种群动态。【结果】1)在牡丹江林口林业局的湖水、曙光和西北楞3个地点,诱捕到的种类均为赤松梢斑螟Dioryctria sylvestrella、冷杉梢斑螟D.abietella和微红梢斑螟D.rubella。2)在湖水,梢斑螟的种群数量最多,平均每天诱捕111.38头;西北楞其次,平均每天诱捕79.625头;曙光最少,平均每天诱捕69.63头。微红梢斑螟在3个地点均是优势种。3)在整个诱捕期间,冷杉梢斑螟和赤松梢斑螟成虫期为6月上旬—7月下旬,高峰期为6月下旬;微红梢斑螟成虫期为6月上旬—8月下旬,高峰期为6月下旬和7月中旬。4)3种梢斑螟都是在21:00—22:00诱捕的数量最多。5)3种梢斑螟的雌雄性比随着季节的推移波动较大,由开始的小于1,到接近于1,最终大于1,但总的性比接近1:1。【结论】梢斑螟的种群动态随时间和小生境的不同变化明显,6月下旬和7月中旬是其羽化高峰期,21:00—22:00是其最活跃时间。因此,对其防治应适时适地采取有效措施。

Analysis on population dynamics of three Dioryctria of Pinus koraiensis plantation

【Objective】Dioryctria spp.are among the most damaging shoot/cone pest insects in the Korean pine plantations in Heilongjiang province,China.Understanding their population dynamics,distribution and population trends would provide critical information for better and timely prevention and control against these economically important pests.【Method】Light traps were employed along edge of forest stands from 19:00 to 23:00 during their adult emergence period(from June 20 to August 1,2018)for capturing and monitoring Dioryctria species composition and their adult population dynamics in Linkou forest bureau,Mudanjiang city.And combine identification of larvae species to analyze their population dynamics.【Result】1)Dioryctria rubella,D.abietella and D.sylvestrella were the three major moth species captured in the light traps at all three locations(Xibeileng,Hushui and Shuguang)tested.2)The highest trap catches occurred at Hushui with an average of 111.38 Dioryctria adults per day,followed by the traps at Xibeileng with an average of 79.625 Dioryctria adults per day,and the traps at Shuguang(the lowest)with an average of 69.63 Dioryctria adults per day.Of which,D.rubella was the most dominant species at all three sites.3)During the whole trapping period,D.rubella emerged from early June to late August,peaking between late June and mid-July,whereas D.abietella and D.sylvestrella both emerged from early June to late July,peaking at late June.4)Most of Dioryctria adults were likely captured during 21:00 and 22:00.5)The sex ratios(♂:♀)of these captured Dioryctria adults varied through the season,starting from<1 to close to 1,and then reaching>1,but their overall sex ratios were close to 1:1【.Conclusion】The population dynamics of Dioryctria spp.vary(temporally and spatially)significantly with species,time and niche.Therefore,effective preventative and control measures against these pest insects should be taken accordingly.