辽宁省二代亚洲玉米螟为害防治的经济阈值

生态学杂志

辽宁省二代亚洲玉米螟为害防治的经济阈值

李帅强,张统书,刘宁,刘超,韩永旭,董辉^*,丛斌^*#br#

（沈阳农业大学植物保护学院，沈阳 110866）

出版日期:2017-01-10 发布日期:2017-01-10

Economic threshold of the second-generation Asian corn borer to corns in Liaoning Province.

LI Shuai-qiang, ZHANG Tong-shu, LIU Ning, LIU Chao, HAN Yong-xu, DONG Hui^*, CONG Bin^1*#br#

(College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, China).

Online:2017-01-10 Published:2017-01-10

摘要/Abstract

摘要： 为探明二代亚洲玉米螟发生量对玉米产量损失的影响，本试验在田间采用人工密度梯度接卵法（0、20、50、100和200块·百株^-1），模拟自然情况亚洲玉米螟发生量，研究辽宁地区二代亚洲玉米螟（Ostrinia furnacalis Guenée）对玉米的经济阈值。结果表明：百株接卵量与虫孔数呈极显著正相关 （P<0.01），百株虫孔数与产量损失率呈极显著正相关（P<0.01），回归方程分别为y=3.1999x+24.8416（R²=0.953，P<0.01），y=0.0234x-1.6167（R²=0.988，P<0.01），推导出百株接卵量与玉米产量损失率的方程为z=0.0749x-1.0354，即落卵量每增加1块，虫孔数增加约3.2个，产量损失率增加7.49%；隧道长度与雌穗长度、穗粗及粒重呈极显著负相关（P<0.01），与产量损失率呈极显著正相关（P<0.01），表明玉米茎秆隧道长度每增加10 cm，玉米平均减产7.02 g，产量损失率平均增加4.38%；根据经济阈值定义，在产量8411 kg·hm^-2的玉米田，使用松毛虫赤眼蜂（Trichogramma dendrolimi Matsumura）进行单次防治时，辽宁地区防治二代亚洲玉米螟的经济阈值为百株玉米累计落卵量17.39块。

Abstract: To determine the influence of second-generation Asian corn borer (Ostrinia furnacalis) (Guenée) on corn yield, we simulated the damage caused by Asian corn borer under natural conditions, to study the economic threshold of the secondgeneration Asian corn borer in Liao-ning. Field tests were conducted to infest the spring corn LD565 with a series of egg mass numbers (0, 20, 50, 100 and 200 eggmasses per 100 plants). Correlation analysis revealed that egg mass number per 100 plants showed a significant positive correlation with stalk hole number per 100 plants (P<0.01), with a regression equation y=3.1999x+24.8416 (R²=0.953, P<0.01); stalk hole numbers per 100 plants showed a significant positive correlation with yield loss rate (P<0.01), with a regression equation y=0.0234x-1.6167 (R²=0.988, P<0.01). The correlation between the number of eggmasses per 100 plants and corn yield loss rate met the equation z=0.0749x-1.0354, meaning that stalk holes would increase by 3.2 and maize yield loss would increase by 7.49% with per one increase in egg mass number. Tunnel length showed a negative correlation with ear length, ear diameter and yield weight per plant (P<0.01), while a positive correlation with yield loss rate (P<0.01). Maize yield loss would increase by 4.38% with per 10 cm increase in tunnel length. In conclusion, the economic threshold of applying richogramma dendrolimi Matsumura to control Asian corn borer would be 17.39 eggmasses per 100 plants in the field with a grain yield of 8411 kg·hm^-2.

李帅强,张统书,刘宁,刘超,韩永旭,董辉*,丛斌*. 辽宁省二代亚洲玉米螟为害防治的经济阈值[J]. 生态学杂志.

LI Shuai-qiang, ZHANG Tong-shu, LIU Ning, LIU Chao, HAN Yong-xu, DONG Hui*, CONG Bin1*. Economic threshold of the second-generation Asian corn borer to corns in Liaoning Province.[J]. cje.