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United States Department of Agriculture

Agricultural Research Service

Title: Assessment of Simulated Boll Weevil Damage Using Airborne Digital Imagery

Authors
item Yang, Chenghai - TX A&M EXP. STN.-WESLACO
item Greenberg, Shoil
item Everitt, James
item Sappington, Thomas
item Escobar, David

Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Proceedings
Publication Acceptance Date: February 15, 2001
Publication Date: N/A

Interpretive Summary: Remote sensing technology combined with ground measurements was used to evaluate artificial boll weevil damage in a cotton field in 2000. Five different levels of artificial square damage (control, 10, 20, 40, and 60%) with three replications were assigned across 15 experimental plots according to an experimental design. The artificial square damage was performed on 25 May when punctured squares by boll weevils were found. Aircraft-based digital images were obtained from the field on 20, 28 June and 11 July. Ground reflectance and plant physical data, including plant height, number of leaves, number of squares, and leaf greenness, were collected on 5 July. Results from this preliminary study showed that severe square damage caused increased foliage and stalk development, thus affecting the spectral response of the cotton plant canopy. Airborne digital imagery detected the differences in spectral response among various slevels of square damage. These preliminary findings indicate that airborne remote sensing techniques have potential for assessing boll weevil infestations within fields. More experiments with more replications and intensive temporal observations are needed to further document and quantify the differences in plant characteristics and spectral response among various square damage levels.

Technical Abstract: Airborne digital imagery, in conjunction with ground reflectance and plant physical data, was used to evaluate simulated boll weevil damage in a cotton field in 2000. Five different levels of artificial square damage (control, 10, 20, 40, and 60%) with three replications were assigned across 15 experimental plots in a randomized complete block design. The artificial square damage was performed on 25 May when punctured squares by boll weevils were found. Airborne color-infrared (CIR) digital images were obtained from the field on 20, 28 June and 11 July. Ground reflectance and plant physical data, including plant height, number of leaves, number of squares, and chlorophyll, were collected on 5 July. The 20 and 28 June images revealed that plants with high artificial square damage levels showed higher spectral response in the near-infrared (NIR) band and lower spectral response in the red and green bands than those with lower damage levels. Plant height and number of leaves were significantly higher for plants with high damage levels than for those with low damage levels. However, there were no significant differences in either spectral response or plant physical characteristics between some of the damage levels. These preliminary results indicate that airborne imagery has potential for assessing boll weevil infestations in cotton fields, but more experiments are needed.

Last Modified: 4/17/2014
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