Abstract
U.S. Department of Agriculture-Agricultural Research Service, Insect Control and CottonDisease Research Unit, 2771 F&B Road, College Station, Texas 77845, United StatesAbstract. Early identification of cotton fields is important for advancing boll weevil eradicationprogress and reducing the risk of reinfestation. Remote sensing has long been used for cropidentification, but limited work has been reported on early identification of cotton fields.Theobjectiveofthisstudyistoevaluateaerialimageryforidentifyingcottonfieldsbeforecottonplants start to bloom. A two-camera imaging system was used to acquire red-green-blue andnear-infrared images with 1-m pixel resolution along two flight lines over an 8km×12 kmcropping area. The images were mosaicked using two approaches: manual georeferencing fol-lowed by position-based mosaicking in Erdas Imagine and content-based automatic mosaickinginPix4DMapper.Themosaickedimageswerethenclassifiedintodifferentcropsandcovertypesusing supervised classification techniques. Results showed that both types of mosaics wereeffective for cotton identification and that maximum likelihood classification produced thebest overall accuracy of 90% for the position-based approach and 91% for the content-basedapproach. The methodologies presented in this study will be useful for boll weevil eradicationprogram managers to quickly and efficiently identify cotton fields at relatively early growthstages using mosaicked aerial imagery.
Highlights
The boll weevil (Anthonomus grandis grandis Boheman) is eradicated from all cottonproducing states in the U.S except for the Rio Grande Valley of Texas.[1]
Cotton producers are required to report the location of planted cotton fields to the Farm Service Agency, this information is belatedly available for the boll weevil eradication program
Early identification of fields planted in cotton is critical for eradication program managers to effectively monitor boll weevil populations and treat the respective fields in a timely manner
Summary
The boll weevil (Anthonomus grandis grandis Boheman) is eradicated from all cottonproducing states in the U.S except for the Rio Grande Valley of Texas.[1]. The eradication program functions by monitoring all cotton fields using pheromone traps to detect incipient weevil populations and by applying insecticides when and where justified by weevil captures or as preventive measures.[2] cotton producers are required to report the location of planted cotton fields to the Farm Service Agency, this information is belatedly available for the boll weevil eradication program. Early identification of fields planted in cotton is critical for eradication program managers to effectively monitor boll weevil populations and treat the respective fields in a timely manner. Another important aspect to ensure the success of the eradication program is the mandatory and timely elimination of cotton plants following harvest and the subsequent creation of a hostfree period.
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