棉花品种抗绿盲蝽特性的田间光谱诊断

调查了生长期14个不同棉花品种上绿盲蝽Apolygus lucorum Meyer-Dür的危害情况。亚洲棉表现为高抗,冀丰杂7号等12个品种表现为中抗,灵-17表现为敏感。田间采用ASD光谱仪对14个棉花品种生长期的冠层光谱进行了测定,发现相同品种不同时期的光谱反射率的一阶微分具有明显差异(P<0.05),在近红外717 nm波段处一阶微分光谱值与棉花抗绿盲蝽级别显著相关(R2=0.89,P=0.01),可较好的表征绿盲蝽危害指数,可利用这个波段的光谱指标对棉花品种的抗绿盲蝽特性进行初步诊断,为棉花抗盲蝽评价选育提供参考。

Using spectral reflectance in the field to determine the resistance of cotton varieties to Apolygus lucorum

The levels of damage caused by the mirid bug Apolygus lucorum Meyer-Dttr on fourteen cotton varieties during the growing season were investigated in the field. Of these varieties it was found that Yazhoumian displayed the highest resistance to A. lucorum, that twelve cotton varieties including Jifengza-7 displayed moderate resistance, and that Ling-17 appeared the most susceptible. The reflectance from the canopies of the 14 varieties was measured by ASD Hand-held Spectro-radiometers and correlation analysis was undertaken to determine the wavebands that were sensitive to damage levels. The first derivative values of canopy reflectance were found to differ significantly among varieties from 690 to 750 nm （P 〈 0. 05）. Also, the first derivative value of canopy reflectance at 717 nm showed a significant negative correlation with the index of resistance to A. lucorum for cotton plants at the seedling stage （ P 〈 0. 05 ） , which could reflect the levels of damage caused by A. lucorum. Therefore, spectral models based on reflectance from the canopy could be used to diagnose the resistance of cotton plants to A. lucorum.