The sugarcane aphid, Melanaphis sacchari (Zehntner), is a destructive insect pest of sorghum, Sorghum bicolor (L.) Moench. Outbreaks of sugarcane aphids were reported in commercial sorghum fields in Kansas, Louisiana, Mississippi, Oklahoma, and Texas. Infestations of sugarcane aphids in sorghum fields are initiated when winged aphids land on plants in the field and produce nymphs. Infestations in a field are not uniform and can increase rapidly in size and intensity. The study used airborne multispectral remote sensing to assess change over time in infestations by sugarcane aphids in sorghum fields. Differencing of bi-temporal normalized differenced vegetation index images followed by analysis of change depicted numerically in the image was effective for assessing the extent of temporal change in infestation by sugarcane aphids in a commercial sorghum field. Classification of normalized differenced vegetation index imagery from two dates into land-cover categories including one for sorghum infested with sugarcane aphid, followed by comparison of change in area and distribution of categories was also a useful method for assessing temporal change in infestations by sugarcane aphids in sorghum. Results indicated it was possible to detect and assess change in sorghum fields infested by sugarcane aphids, with 65% increase in area in a field severely infested by sugarcane aphids in only 1 week.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 43 • No. 4