Vegetation indices as indicators of damage by the sunn pest (Hemiptera : Scutelleridae) to field grown wheat


GENÇ H. , GENÇ L. , TURHAN H. , Smith S. E. , Nation J. L.

AFRICAN JOURNAL OF BIOTECHNOLOGY, cilt.7, ss.173-180, 2008 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 7 Konu: 2
  • Basım Tarihi: 2008
  • Dergi Adı: AFRICAN JOURNAL OF BIOTECHNOLOGY
  • Sayfa Sayıları: ss.173-180

Özet

The sunn pest, Eurygaster integriceps Put. ( Hemiptera: Scutelleridae), also known as sting or cereal pest, is one of the most economically important pests of wheat in the world. In this study, a collapsible nylon cloth cage experiments were conducted to determine the feasibility of using remote sensing techniques to detect stress in wheat caused by the density of sunn pests. The results show we can detect the amount of stress in wheat caused by different life stages of sunn pest with a hand-held radiometer. Normalized difference vegetation index (NDVI) based indices; NDVIsg, NDVId, NDVIr, and structure insensitive pigment index ( SIPI) were chosen out of 19 indices initially tested. The NDVI based vegetation indices derived from hyperspectral data, recorded by a hand held spectroradiometer, were used to determine the predicted indices using the initial number of Sunn Pest (NOSP). Overall, r(2) values of all predicted indices calculated for 3(rd) instars were lower than those of 4(th) and adult stage. When r(2) was considered separately, predicted NDVIr index value (87.4) was the highest and predicted SIPI index value is lowest (80.7) in 3(rd) instars. The highest r(2) value was obtained in adult stage of sunn pest is NDVIsg (96.9) compare with NDVId (95.5), NDVIr (92.4) and SIPI (94.2). It was also concluded that remote sensing could detect not only the different stages pest damage on wheat, but also the number of sunn pest stages density affect in controlled experiments.